release: cut v2.7.0 — ICS export & import (.ics share, backup, open/receive)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitea/workflows/translations.yaml

@@ -0,0 +1,41 @@
+name: Translations
+
+# Fast, SDK-free parity check for translation resources, so Weblate PRs (which
+# only touch values-*/strings.xml) get quick feedback without the full Android
+# build. The deeper checks still run in CI via lintDebug (ExtraTranslation).
+on:
+  push:
+    branches:
+      - '**'
+    tags-ignore:
+      - '**'
+    paths:
+      - 'app/src/main/res/values*/strings.xml'
+      - 'app/src/main/res/xml/locales_config.xml'
+      - 'scripts/check_translations.py'
+      - '.gitea/workflows/translations.yaml'
+
+concurrency:
+  group: translations-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  check:
+    runs-on: docker
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Ensure python3
+        run: |
+          if ! command -v python3 >/dev/null 2>&1; then
+            if command -v apt-get >/dev/null 2>&1; then
+              apt-get update && apt-get install -y python3
+            elif command -v apk >/dev/null 2>&1; then
+              apk add --no-cache python3
+            fi
+          fi
+          python3 --version
+
+      - name: Check translation parity
+        run: python3 scripts/check_translations.py

.planning/ROADMAP.md

@@ -107,43 +107,338 @@ Deliberately deferred (add only if needed):
 - Snooze / dismiss notification actions (Etar has them)
 - Battery-optimization exemption prompt for delivery reliability
 
-## v3.0 — Power-User Features
+## v2.1 — Month event grid + drawer view tabs (shipped 2026-06-15)
 
-- Home-screen widget
-- Full-text search
-- Tablet / foldable layouts
-- Optional: ICS file import (drag-and-drop)
-- Optional: move event to another calendar (copy+delete model with a
-  consequences warning — deferred from v2.0, see above)
+- Month grid shows real events as continuous multi-day bars (not just dots)
+- View section in the navigation drawer to switch Month / Week / Day
+- Fix: text cursor no longer jumps in event text fields
 
-Order is indicative — community feedback after V1 may re-prioritize.
+## v2.2 — Tap-to-create + local calendar management (shipped 2026-06-16)
 
-## Idea backlog — Daily-driver polish (captured 2026-06-11, all approved as ideas, unscheduled)
+- Tap an empty slot in day/week → create form prefilled with that day + the
+  tapped hour (snapped to the hour, 1 h long)
+- Local (device-only) calendar management in a full-screen editor from
+  Settings → Calendars: create / rename / recolor / delete, with name,
+  pastel-previewed colour, and description (stored in `CAL_SYNC1`)
+- Synced calendars listed read-only, grouped by account, each with a
+  per-account "manage in source app" deep-link (resolved from the account's
+  authenticator — DAVx5/ICSx5/…) + an add-account shortcut
+- Shared `InlineTextField` extracted to `ui.common` (event form + calendar
+  editor share one input style)
 
-Interaction:
-- Tap/long-press an empty slot in day/week → create form prefilled with that time
-- Drag & drop rescheduling in day/week (recurring drops reuse the scope dialog) — big-ticket, own slice
-- Agenda view (fourth view: upcoming events grouped by day; natural widget data source)
+## v2.3 — Material 3 grouped-list redesign (shipped 2026-06-16)
+
+A structural + visual pass adopting one shared blueprint (modelled on the ReFra
+gallery app) across Settings, the calendar manager and the navigation drawer.
+
+- Shared `ui/common/GroupedList.kt`: `CollapsingScaffold` (a `LargeTopAppBar`
+  whose title collapses on scroll) + `GroupedRow` (Position-based corner
+  grouping, press-animated corners, `selected` + `minHeight` knobs).
+- Settings: category hub with About card on top and sliding sub-pages
+  (Appearance / New event form / Notifications); theme/week-start/language
+  pickers moved from `DropdownMenu` to OptionCard dialogs; token-based icon
+  chips; `ic_gitea.xml` for the About "Source" button.
+- Calendar manager + drawer restyled to match; shared `CalendarColorChip`;
+  drawer scrolls as one with the active view highlighted.
+- Cards use `surfaceContainerHigh` for readable contrast.
+- Donate button on the About card deferred (target TBD).
+
+---
+
+# Backlog (theme-based, post-v2.1)
+
+The old v3.0 / "daily-driver polish" / "Locations & People" lists are
+consolidated here by theme. Within a group, **(in progress)** /
+**(next)** mark what is being or about to be worked; everything else is an
+approved-but-unscheduled idea unless tagged **(idea)** /
+**(go/no-go)** / **(rejected)**. Order across groups is not a commitment.
+
+## Near-term sequence (ranked, 2026-06-16)
+
+The theme groups below are the full menu; this is the committed *order* for
+the next stretch. Ranking favours finishing the current create/edit + calendar
+arc before opening new fronts, then cheap-relative-to-value items and ones that
+unblock a later item. Order is a plan, not a contract — revisit after each lands.
+
+**Tier 1 — finish the current arc (create/edit + calendars)**
+1. Tap-to-create in day/week *(shipped v2.2.0)* — prefilled create from an empty slot
+2. Local calendar management + "manage in source app" deep-links *(shipped v2.2.0)*
+3. ~~Settings redesign & restructure~~ *(shipped v2.3.0 — grew into the full
+   grouped-list blueprint across Settings + calendars + drawer; see "v2.3"
+   above)*
+4. ~~Per-event color~~ *(shipped v2.4.0)* — palette calendars write
+   `EVENT_COLOR_KEY` (sync-safe); local/opted-in calendars write a raw
+   `EVENT_COLOR`; off-by-default setting for no-palette synced calendars
+Tier 1's create/edit + calendars arc is effectively closed. **Duplicate event**
+was deprioritised (2026-06-17) as low-importance and dropped to the bottom of
+the sequence; the next item is now **Jump-to-date** (formerly Tier 2).
+
+(Tier 2+ numbering below shifts accordingly; ranking unchanged.)
+
+### Settings redesign & restructure *(shipped v2.3.0)*
+
+The original scope below is kept as a record; the implementation expanded from a
+sub-screen restructure into the shared grouped-list blueprint (see "v2.3" above).
+
+The settings screen has grown into a flat vertical scroll of divider-separated
+sections (Appearance, Event form, Notifications, Calendars, Language, About) and
+will keep accreting rows (per-event-color defaults, default reminder, more
+calendar entries are all queued). It needs structure before it gets unwieldy.
+
+**Decided (2026-06-16): sub-screens**, not flat-but-carded. The top level
+becomes a category list; each category opens its own destination. More
+M3-idiomatic for a settings surface that will keep growing, and it mirrors the
+existing Calendars row, which already navigates out to its own screen.
+
+Structure — top-level settings list → category destinations:
+- **Appearance** → theme, dynamic colour, week start
+- **Event form** → the 6 default-field toggles + the hint text
+- **Notifications** → reminders toggle (POST_NOTIFICATIONS flow stays)
+- **Calendars** → already its own screen (`CalendarsScreen`); just becomes a
+  peer category row, no change to that screen
+- **Language** → single control; keep as a top-level row that opens an
+  OptionCard directly (a whole sub-screen for one choice is overkill)
+- **About** → kept inline on the top-level list as a card (read-only info,
+  not worth a navigation hop). Card layout, top → bottom:
+  - **Identity** — app logo + name "Calendula", with "by Jean-Luc Makiola"
+    as a subtitle beneath the name
+  - **Action buttons** (small, button-styled, sit in a row):
+    - **Source** — Gitea logo, opens the repo (`about_source_url`)
+    - **License** — opens the LICENSE file on Gitea
+    - **Donate** *(tentative)* — sits next to Source; target TBD (decide
+      before building: Liberapay / Ko-fi / Gitea sponsor / etc.)
+  - **Version** — small version number at the bottom of the card
+
+Scope:
+- **Navigation** — add the settings sub-screen destinations alongside the
+  existing settings/calendars routes in `CalendarHost`; back pops to the
+  settings list (mind the existing `BackHandler` that guards against falling
+  through to the activity).
+- **Fix the dialog-pattern violation** — theme, week-start and language use
+  `DropdownMenu`; the project default is the full-width tonal OptionCard modal
+  (radio/dropdown/text-list dialogs are banned, see
+  `option-card-modal-style-default`). Migrate these selectors to OptionCard.
+- **Visual pass** — top-level category rows with leading icons; consistent
+  spacing and row affordances aligned with the event-form card design system.
+
+Out of scope (no new settings *features* here) — this is a structure + style
+pass on the existing controls; new toggles ride in with their own features.
+
+**Tier 2 — navigation & daily-driver completeness**
+5. ~~Jump-to-date — drawer date picker (un-cut from V1); cheap, fills the nav gap~~ *(done, v2.5.0)*
+6. ~~Agenda view — the missing 4th view; serves daily-driver users *and* becomes the data source for the widget~~ *(done, v2.5.0)*
+
+**Tier 3 — platform reach (depends on Tier 2)**
+7. ~~Home-screen widget — built on the agenda data source from #6~~ *(done, v2.5.0 — agenda + month widgets)*
+8. App shortcuts: ~~launcher long-press → New event~~ *(done, v2.5.0)*; optional quick-settings tile still open
+
+**Tier 4 — reliability, data-safety & interop** *(re-ranked 2026-06-17)*
+9. **Reminders — defaults + delivery reliability** *(shipped v2.6.0)* — global
+   default reminder **+ per-calendar override**, bundled with battery-exemption
+   hardening. Full sketch in "Reminders — defaults & delivery reliability" below.
+10. **The `.ics` engine — export + import** *(in progress → v2.7)* — one
+    hand-rolled serializer/parser (zero deps, stays on `kotlinx-datetime`),
+    four surfaces: single-event share + whole-calendar backup (export),
+    open-`.ics`→form + whole-calendar restore (import). Closes the
+    device-local-calendar data-loss gap (#10/#11 merged here). Built as **two
+    sequential branches in one release**: `feat/ics-export` (write side +
+    UID-on-create precursor) then `feat/ics-import` (parser, restore, dedup).
+    Import is liberal-in/strict-out: skip-and-report foreign `VTIMEZONE` /
+    `RECURRENCE-ID` it can't model. Timezone rule: all-day `VALUE=DATE`,
+    non-recurring timed UTC `Z`, recurring timed `TZID`-labelled from the stored
+    `EVENT_TIMEZONE` (no `VTIMEZONE` blocks; resolved against the OS tz DB on
+    import). Plan: `docs/superpowers/plans/2026-06-18-05-ics-export.md`.
+11. **Snooze / dismiss notification actions** *(next, after v2.7)* — follows the
+    `.ics` work; inherits v2.6's deferred exact-alarm/WorkManager decision (snooze
+    must re-fire an alarm).
+12. Drag & drop rescheduling in day/week — big-ticket, own slice (recurring drops reuse the scope dialog)
+
+**Gated — explicit go/no-go before any work (mostly INTERNET-permission calls)**
+- Remote calendar create/edit (re-implements DAVx5; INTERNET + credential storage)
+- Locations & People — contact address picker (no-permission, one-shot) is the safe entry; OSM autocomplete needs INTERNET
+- Move event to another calendar — sync-adapter minefield (copy+delete model)
+
+**Bottom — deprioritised, not important**
+- Duplicate event (detail action → prefilled create form) — moved here
+  2026-06-17; cheap but low value, pick up only if asked
+
+**Unranked / fill-in** — pinch-to-zoom time scale, tablet/foldable layouts,
+full-text search, ICS file import. Pulled in opportunistically, not sequenced.
+
+Debatable calls worth a second look: whether **local-calendar backup (#10)**
+should lead Tier 4 outright (it's a silent data-loss risk, not a feature);
+whether drag-drop (#12) jumps ahead given its daily-driver impact.
+
+## Navigation & views
+
+- ~~Tap an empty slot in day/week → create form prefilled with that
+  date+time, snapped to the hour~~ **shipped v2.2.0** (long-press variant
+  not added — single tap covers it)
+- Agenda view (fourth view: upcoming events grouped by day; also the
+  natural data source for a future widget)
+- Jump to date — drawer date picker (un-cut from V1)
+- Current-time "now" line in day/week — standard in every calendar, cheap,
+  currently absent. Daily-driver polish.
+- Week numbers in the **month** grid — week view already shows the badge
+  (`WeekNumberBadge`, `WeekScreen.kt`); extend to month for ISO/European users.
 - Pinch-to-zoom time scale in day/week
+- Tablet / foldable layouts *(was v3.0)*
+- Full-text search *(was v3.0)* — promote out of "fill-in": for a daily driver
+  with real event history, finding an event is core completeness, not optional.
 
-Reminders, round two:
-- Snooze + dismiss actions on the notification (snooze needs an exact-alarm/WorkManager decision)
-- Settings default reminder applied to new events
+## Event editing & creation
 
-Event niceties:
+- Drag & drop rescheduling in day/week (recurring drops reuse the scope
+  dialog) — big-ticket, own slice
 - Duplicate event (detail action → prefilled create form)
-- Per-event color (`Events.EVENT_COLOR`, OptionCard picker in the form)
-- Share event as .ics + open/receive .ics into a prefilled create form (front-runs v3 ICS import)
+- **Per-event color** (`Events.EVENT_COLOR`, OptionCard picker in the form)
+  *(next)* — chosen to follow the in-progress tap-to-create + calendar
+  management work: reuses the color-picker component and palette plumbing
+  being built for local calendar management, and finishes the create/edit
+  theme. `EVENT_COLOR` / `EVENT_COLOR_KEY` from the calendar's color list
+  (`Colors` table, `TYPE_EVENT`); falls back to the calendar color when unset.
 
-Small delights:
-- App shortcuts (launcher long-press → New event), maybe a quick-settings tile
-- Jump to date (un-cut from V1 — drawer date picker)
+## Calendars & accounts
 
-Consciously rejected: travel time / weather / smart suggestions (network,
-core-promise conflict), natural-language quick entry (high effort,
-locale-fragile, prefilled form already covers fast entry).
+- ~~Create / manage local (device-only) calendars~~ **shipped v2.2.0** —
+  name + color + description; rename / recolor / delete the calendars the app
+  owns. Inserted under `ACCOUNT_TYPE_LOCAL` as a sync adapter; description in
+  `CAL_SYNC1`. Full-screen "Calendars" editor reached from Settings.
+- ~~Per-calendar "manage in source app" deep-link~~ **shipped v2.2.0** — for
+  synced calendars, open the app the calendar actually came from based on
+  its `ACCOUNT_TYPE` (DAVx5 `bitfire.at.davdroid`, Google `com.google`,
+  …); fall back to system account/sync settings. Plus an "add account"
+  entry into system Accounts. Honest boundary for remote calendars.
+- **Remote calendar create/edit** *(go/no-go)* — creating a CalDAV
+  collection (`MKCALENDAR`) or a Google calendar means an in-app sync
+  client: **INTERNET permission, credential storage, the full server
+  round-trip** — i.e. re-implementing DAVx5. DAVx5 exposes no public
+  intent to delegate the create to it. Cosmetic local edits (color/name)
+  to an existing synced row are possible but don't propagate to the server
+  and may be overwritten on next sync — not promised. Same explicit
+  go/no-go gate as the OSM/INTERNET item below.
+- Move event to another calendar (copy+delete model with a consequences
+  warning — deferred from v2.0; `CALENDAR_ID` is sync-adapter-owned) *(was v3.0)*
+- **Local-calendar backup / export** *(Tier 4 #10)* — device-only
+  (`ACCOUNT_TYPE_LOCAL`) calendars are first-class in Calendula but have **no
+  sync and therefore no backup**: a lost/wiped phone destroys them permanently.
+  Whole-calendar `.ics` (VCALENDAR) export to a user-chosen file (SAF), plus
+  restore-on-import that recreates events into a chosen local calendar. Reuses
+  the .ics serializer from the single-event share work; the restore path reuses
+  the import parser. A data-integrity obligation, not a feature.
 
-## Idea backlog — Locations & People (captured 2026-06-11, undecided)
+## Reminders — defaults & delivery reliability *(implemented 2026-06-17, `feat/default-reminders` — pending on-device review)*
+
+Two themes bundled because both are "make reminders trustworthy" — the core of
+the "Calendula is your only calendar app" promise.
+
+**Built in this slice (A + the safe half of B):** global timed default reminder
++ a **separate all-day default** (day-scale lead times) + per-calendar override
+(timed events), applied on create with manual-edit / calendar-switch / all-day-
+toggle handling; three pickers + per-calendar override list in Settings →
+Notifications; battery-optimisation exemption row (status + system deep-link, no
+extra permission). `resolveDefaultReminder` + prefs round-trips unit-tested.
+Resolution model: all-day events use the all-day global default outright;
+per-calendar overrides govern timed events only. Reviewed (8-angle), fixes
+applied: form-reset state race, label-fn consolidation with the detail screen,
+inline wrapper + single combined flow read.
+
+**Deliberately deferred (documented decisions, not oversights):**
+- *Absolute time-of-day for all-day reminders* — the all-day default is still
+  minutes-before-midnight (day-scale presets), not "9am the day before" (open
+  decision #2's richer half). Per-calendar all-day overrides also deferred.
+- *Self-scheduled alarms* — kept the existing provider-broadcast architecture
+  (open decision #1). The battery exemption is the reliability lever; no
+  `AlarmManager`/`USE_EXACT_ALARM` subsystem was added.
+- *Test-reminder diagnostic* and *battery prompt inside onboarding* — the
+  exemption lives only in Settings for now (onboarding flow untouched to keep
+  the change reviewable).
+
+### A. Default reminders (global + per-calendar override)
+
+**No provider backing.** `CalendarContract` has no column that auto-applies a
+default reminder per calendar — Google's per-calendar defaults live server-side.
+So both the global default *and* the per-calendar override are **app-side
+preferences**, applied by us at event-insert time. We inherit nothing from the
+synced calendar.
+
+- **Storage (DataStore):**
+  - `defaultReminderMinutes: Int?` — global default; `null` = "no reminder".
+  - `defaultAllDayReminderMinutes: Int?` — separate all-day default (all-day
+    reminders are expressed as minutes before midnight / day-before-at-time, not
+    minutes before a start instant — they need their own value).
+  - `perCalendarReminderOverride: Map<Long, Int?>` — keyed by calendar id;
+    **absent key = inherit global**, explicit `null` = "no reminder for this
+    calendar". (Same for an all-day override map if we want per-calendar all-day.)
+- **Apply on create:** a fresh event prefills its reminders list from
+  override-or-global for the preselected calendar. Changing the calendar in the
+  form re-applies the *new* calendar's default **only if the user hasn't manually
+  edited the reminders** — track a dirty flag, mirroring the per-event-color
+  reset pattern (v2.4).
+- **Edit semantics:** defaults apply to **new events only**; never rewrite
+  reminders on existing events on open or on calendar-switch-during-edit.
+- **Settings UI (Notifications sub-page):**
+  - Global default via OptionCard (None / at time of event / 5 / 10 / 15 / 30 min
+    / 1 h / 1 day / custom), plus the separate all-day default.
+  - Per-calendar overrides: a row per writable calendar (in the Calendars screen
+    or a Notifications subsection), each opening the same OptionCard with a
+    leading **"Use global default"** option.
+
+### B. Delivery reliability (exact alarms + battery)
+
+The provider broadcasts `EVENT_REMINDER`, but on modern Android (Doze / OEM
+battery managers) delivery can be silently delayed or dropped. v1.4 deferred this;
+it directly undermines the feature's premise, so it rides in here.
+
+- **Exact alarm — decision first:** trust the provider broadcast, or
+  self-schedule via `AlarmManager.setExactAndAllowWhileIdle` for reliability?
+  If we self-schedule, declare `USE_EXACT_ALARM` (API 33+, auto-granted for
+  calendar/alarm-category apps, F-Droid-clean) with a `SCHEDULE_EXACT_ALARM`
+  fallback for API 31–32 (user-revocable → settings deep-link prompt).
+- **Battery-optimization exemption:** a *soft, optional* prompt via
+  `ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS` (settings deep-link — never the
+  auto-grant intent), honest copy: "Android may delay reminders to save battery;
+  exempt Calendula for on-time delivery." Shown once after the existing
+  `POST_NOTIFICATIONS` onboarding step, reversible in Settings → Notifications.
+- **Diagnostics:** a "send a test reminder in 1 minute" button in Notifications
+  settings so users can verify delivery on their specific OEM (Samsung / Xiaomi
+  are notorious for suppressing it).
+
+### Open decisions (resolve before building)
+
+1. Self-schedule via `AlarmManager` vs trust the provider broadcast
+   (reliability vs simplicity + battery cost).
+2. All-day reminder representation (minutes-before vs absolute time-of-day).
+3. Where per-calendar overrides live in the UI (rows on the Calendars screen vs
+   a list inside the Notifications sub-page).
+
+### Later (round two)
+
+- Snooze + dismiss actions on the notification (snooze needs an
+  exact-alarm / WorkManager decision) — Tier 4 #13.
+
+## Sharing & interop
+
+- Share event as .ics + open/receive .ics into a prefilled create form
+  (front-runs the import below)
+- ICS file import (drag-and-drop) *(was v3.0, optional)*
+
+## Platform & launchers
+
+- ~~Home-screen widget~~ **shipped v2.5.0** — agenda + month widgets
+- ~~App shortcuts (launcher long-press → New event)~~ **shipped v2.5.0** —
+  optional quick-settings tile still open
+
+## Quality & reliability
+
+- **Accessibility pass** — TalkBack content descriptions across all screens,
+  dynamic-type / large-font reflow, touch-target audit. Quality bar for an
+  F-Droid app; nothing tracks it yet.
+- **Reminder delivery reliability** — exact alarms + battery-optimization
+  exemption; specced in the "Reminders — defaults & delivery reliability" slice
+  above (Tier 4 #9).
+
+## Locations & People *(go/no-go, captured 2026-06-11)*
 
 Beyond classic calendar-client scope; discussed, deliberately not planned
 in detail yet:
@@ -163,3 +458,10 @@ in detail yet:
 - **Attendee editing / invites from contacts** — own milestone; writing
   `Attendees` rows touches sync-adapter invitation behavior (Google vs
   DAVx5 differ).
+
+## Consciously rejected
+
+- Travel time / weather / smart suggestions (network, core-promise conflict)
+- Natural-language quick entry (high effort, locale-fragile; the prefilled
+  form already covers fast entry)
+- Quick-add sheet (the prefilled full form already covers it — cut in v2.0)

.planning/STATE.md

@@ -1,13 +1,17 @@
 # Calendula — Current State
 
-*Last updated: 2026-06-11*
+*Last updated: 2026-06-17*
 
 ## Status
 
-**Milestone:** 2 (write support) **complete** — v2.0.0 shipped 2026-06-11.
-**Phase:** between milestones. Next: v3.0 (power-user features) and the
-go/no-go on the "Locations & People" idea backlog (`ROADMAP.md`). Docs
-pass done (ARCHITECTURE.md, README overhaul, planning docs refreshed).
+**Milestone:** 2 (write support) **complete** — v2.0.0 shipped 2026-06-11;
+v2.1.0 (month event grid, drawer view tabs, cursor fix) shipped 2026-06-15.
+**Phase:** post-2.1 backlog work. v2.2.0 (tap-to-create in day/week + local
+calendar management) and v2.3.0 (Material 3 grouped-list redesign of Settings,
+the calendar manager and the navigation drawer) both shipped 2026-06-16;
+v2.4.0 (per-event colors) and v2.5.0 (jump-to-date, Agenda view, home-screen
+agenda + month widgets, and a "New event" launcher shortcut) shipped
+2026-06-17. The backlog is now organised by theme in `ROADMAP.md`.
 
 ## Progress
 
@@ -71,10 +75,56 @@ pass done (ARCHITECTURE.md, README overhaul, planning docs refreshed).
   quick-add cut, calendar-switch → v3 backlog; F-Droid/README copy
   refreshed, fastlane screenshots DE+EN captured on-device
 
+- [x] v2.1 (shipped 2026-06-15) — month grid shows real events as
+  continuous multi-day bars; navigation-drawer View section
+  (Month/Week/Day); cursor-jump fix in event text fields
+
+- [x] v2.2 (shipped 2026-06-16) — tap an empty slot in day/week to create
+  (prefilled with that day + tapped hour, snapped to the hour); local
+  calendar management in a full-screen editor from Settings →
+  Calendars: create/rename/recolor/delete device-only calendars
+  (`ACCOUNT_TYPE_LOCAL`, sync-adapter insert) with name, pastel-previewed
+  colour, and description (stored in `CAL_SYNC1`); synced calendars listed
+  read-only grouped by account with a per-account "manage in source app"
+  deep-link (resolved from the account's authenticator: DAVx5/ICSx5/…) and
+  an add-account shortcut. Shared `InlineTextField` extracted to `ui.common`
+
+- [x] v2.3 settings/calendars/drawer redesign (shipped 2026-06-16) — adopted a
+  shared Material 3 grouped-list blueprint, modelled on the ReFra gallery app
+  and extracted to `ui/common/GroupedList.kt` (`CollapsingScaffold` with a
+  `LargeTopAppBar` exit-until-collapsed title; `GroupedRow` with Position-based
+  corner grouping, press-animated corners, `selected` + `minHeight` knobs).
+    - Settings: category hub (About card on top → version mark at the foot) with
+      sliding sub-pages (Appearance / New event form / Notifications); token-
+      based icon chips; theme/week-start/language pickers migrated from
+      `DropdownMenu` to OptionCard dialogs. New `ic_gitea.xml` (Simple Icons,
+      verbatim path) for the About "Source" button; en+de strings.
+    - Calendar manager: same collapsing scaffold + grouped rows; shared
+      `CalendarColorChip` (neutral chip, pastelised calendar glyph).
+    - Navigation drawer: branded header, grouped View switcher (active view
+      highlighted via `secondaryContainer`), the filter list restyled to
+      grouped rows with a trailing checkbox; the whole drawer scrolls as one.
+    - Cards use `surfaceContainerHigh` for readable contrast against `surface`.
+    - Donate button on the About card deferred (target still TBD).
+
+- [x] v2.4 per-event color (shipped 2026-06-17) — an optional "Color" field in
+  the event form. Read/render already resolved `EVENT_COLOR` with a calendar
+  fallback; this adds the write side and the picker. Palette-backed calendars
+  (Google, some CalDAV) pick from the account's `Colors` (`TYPE_EVENT`) and
+  write `EVENT_COLOR_KEY` so the color round-trips through sync; local
+  calendars write a raw `EVENT_COLOR` from the shared `CALENDAR_COLOR_PALETTE`
+  (extracted with the swatch row to `ui/common/ColorSwatchRow.kt`). Switching
+  calendars resets the choice (a key is account-scoped). A settings toggle
+  ("Allow colors on unsupported calendars", off by default) extends the raw
+  path to synced calendars with no palette, with an honest "may not survive
+  sync" warning on the picker and in Settings. Color writes flow through
+  insert / dirty-checked update / occurrence-exception; mapper + form tests.
+
 ## Next
 
-1. Decide the "Locations & People" go/no-go (INTERNET permission question)
-   — see `ROADMAP.md` idea backlog
-2. v3.0 scoping: widget, full-text search, tablet layouts, ICS import,
-   calendar-move
-3. Monitor the F-Droid build/publish for the v1.4.0 / v2.0.0 tags
+1. Monitor the F-Droid build/publish for the v2.4.0 tag
+2. Decide the "Locations & People" and "remote calendar create/edit"
+   go/no-go calls (both hinge on the INTERNET permission) — see `ROADMAP.md`
+3. **Duplicate event** and **jump-to-date** are the cheap follow-ups; then
+   agenda view (strategic, backs a future widget). Full ranked sequence in
+   `ROADMAP.md` → "Near-term sequence".

CHANGELOG.md

@@ -7,6 +7,119 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [2.7.0] — 2026-06-18
+
+### Added
+- Share a single event as an `.ics` file from the event detail screen — hands a
+  standard calendar file to any app via the system share sheet.
+- Back up your local (device-only) calendars: Settings → Calendars → Export as
+  `.ics` file writes every event of your on-device calendars to a file you
+  choose. Local calendars aren't synced anywhere, so this is their only backup.
+- Open or share an `.ics` file into Calendula: a single event opens the create
+  form prefilled for review, while a file with many events (e.g. a backup) opens
+  a bulk import — pick a calendar and import them all. Re-importing a backup
+  won't create duplicates (events are matched by their unique identifier), and
+  anything Calendula can't represent (changed recurring occurrences, guest
+  lists) is reported rather than silently dropped.
+
+### Fixed
+- All-day events that cover a single day (e.g. a birthday) no longer show up on
+  the following day as well — in the day, week and month views or on the event
+  detail screen. The extra day came from interpreting the all-day date range in
+  the device's time zone instead of UTC.
+- Fixed the app crashing immediately on every launch in the optimized release
+  build: release code-shrinking (R8) was stripping a database class the
+  home-screen widget framework needs, so the app died at startup before showing
+  anything. Added the missing keep rule.
+
+## [2.6.0] — 2026-06-18
+
+### Added
+- App language can now be set from Android's system per-app language settings
+  (Android 13+), in addition to the in-app picker in Settings — and the app is
+  set up so further languages can be added by community translators
+
+### Fixed
+- Changing the app language in Settings now takes effect immediately; the
+  picker previously had no effect
+
+## [2.5.0] — 2026-06-17
+
+### Added
+- Home-screen widgets (two of them): an "Upcoming" agenda widget — a scrolling
+  list of the next month of events grouped under day headers, with refresh and
+  "New event" buttons — and a month-grid widget showing the full month with
+  today highlighted, connected multi-day event bars, and prev/next/today
+  navigation. Both reuse the in-app grouping and layout so they match the app
+  exactly, respect your hidden-calendar choices, and refresh automatically when
+  the calendar changes or the day rolls over. Tapping a day opens that day;
+  tapping an event opens its details
+- App shortcut: long-press the Calendula icon for a "New event" action that
+  jumps straight into the create-event form
+- Agenda view — a fourth top-level view alongside Month/Week/Day: a
+  forward-looking list of upcoming events grouped under "Today"/"Tomorrow"/date
+  headers, reachable from the view switcher
+- Jump to date — a "Jump to date" row in the navigation drawer opens a date
+  picker and moves the active view (Month/Week/Day/Agenda) to the chosen day
+
+## [2.4.0] — 2026-06-17
+
+### Added
+- Per-event colors: give a single event its own color, instead of always
+  inheriting its calendar's. Add the new "Color" field from "More fields" in
+  the event form. On calendars that publish their own color set — such as
+  Google — you pick from that calendar's palette, so the color is stored
+  with the event and shows correctly on every synced device. On local
+  calendars you pick from Calendula's palette. "Reset" returns an event to
+  its calendar's color
+- A new "Allow colors on unsupported calendars" setting (New event form,
+  off by default) extends per-event colors to calendars that publish no
+  color set of their own (some CalDAV). Such a color is kept on the device
+  and may be dropped or overwritten on that calendar's next sync — a
+  limitation of those calendars, called out plainly in the setting and on
+  the color picker
+
+## [2.3.0] — 2026-06-16
+
+### Changed
+- Redesigned Settings around the Material 3 grouped-list pattern: a large
+  title that collapses into the toolbar as you scroll, category cards on the
+  main screen, and dedicated sub-pages for Appearance, the new-event form, and
+  Notifications. The theme, week-start and language pickers now use the app's
+  standard option-card dialogs instead of dropdown menus
+- About moved to the top of Settings as a card — app icon, author, and quick
+  links to the source code and licence — with the version shown plainly at the
+  foot of the list
+- The Calendars screen now uses the same grouped-card layout and collapsing
+  title, and each calendar shows a soft pastel-tinted calendar glyph rather
+  than a plain colour swatch
+- Redesigned the navigation drawer to match: a branded header, the
+  Month / Week / Day switch and your calendars as grouped cards (with the
+  active view highlighted), and the whole drawer now scrolls as one
+
+## [2.2.0] — 2026-06-16
+
+### Added
+- Tap an empty slot in the day or week view to create an event there: the
+  create form opens prefilled with that day and the tapped hour (snapped to
+  the hour, one hour long). Tapping an existing event still opens it
+- Local calendars: create and manage device-only calendars that live
+  entirely on this phone — no account, no sync — from a new "Calendars"
+  screen in Settings. Give each a name, a colour, and an optional
+  description; rename, recolour, or delete them later. Useful when you want
+  a calendar without setting up an account
+- The Calendars screen also lists your synced calendars (DAVx5, ICSx5, …)
+  grouped by account, each with a "Manage" button that opens the app the
+  calendar actually comes from, plus an "Add account" shortcut to the
+  system account settings. Calendula never touches a synced calendar's
+  server itself — that stays with its own app
+
+### Changed
+- Colour swatches in the calendar editor now preview the soft, pastel tone
+  a calendar is actually drawn with, instead of a bright raw colour
+- The calendar editor reuses the event form's field and button styling for
+  a consistent look
+
 ## [2.1.0] — 2026-06-15
 
 ### Added

app/build.gradle.kts

@@ -28,8 +28,8 @@ android {
         // the tag, with versionCode = MAJOR*10000 + MINOR*100 + PATCH
         // (e.g. v2.0.0 -> 20000). These committed values are the dev/local
         // default; keep them matching the latest released tag. See docs/RELEASING.md.
-        versionCode = 20100
-        versionName = "2.1.0"
+        versionCode = 20700
+        versionName = "2.7.0"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }
@@ -78,6 +78,15 @@ android {
         }
     }
 
+    lint {
+        // Community translations are expected to be partial — a missing string
+        // falls back to the English base at runtime — so don't fail the build on
+        // it. Stale/extra keys (ExtraTranslation) stay fatal; scripts/
+        // check_translations.py guards the same invariants with clearer,
+        // translator-facing messages.
+        informational += "MissingTranslation"
+    }
+
     testOptions {
         unitTests {
             all { it.useJUnitPlatform() }
@@ -113,6 +122,9 @@ dependencies {
 
     implementation(libs.androidx.datastore.preferences)
 
+    implementation(libs.androidx.glance.appwidget)
+    implementation(libs.androidx.glance.material3)
+
     implementation(libs.kotlinx.datetime)
     implementation(libs.kotlinx.coroutines.core)
 

app/proguard-rules.pro

@@ -4,3 +4,14 @@
 
 # Compose Compiler may keep its own; defaults are fine
 -dontwarn org.jetbrains.annotations.**
+
+# Room database implementations (pulled in transitively via
+# androidx.glance:glance-appwidget → androidx.work → androidx.room).
+# The widgets rely on Glance, whose WorkManager backend stores state in a Room
+# database. Under R8 full mode (AGP 9 default) the generated *_Impl subclasses
+# of RoomDatabase lose their usable no-arg constructor / are marked abstract,
+# so Room's reflective instantiation throws InstantiationException and the app
+# crashes at startup with "Failed to create an instance of ...WorkDatabase".
+# Keep the generated Room database implementations fully intact.
+-keep class * extends androidx.room.RoomDatabase { *; }
+-dontwarn androidx.room.paging.**

app/src/main/AndroidManifest.xml

@@ -5,6 +5,25 @@
     <uses-permission android:name="android.permission.READ_CALENDAR" />
     <uses-permission android:name="android.permission.WRITE_CALENDAR" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <!--
+      Lets the "Reliable delivery" setting open the direct system dialog to
+      exempt Calendula from battery optimisation (so reminder broadcasts aren't
+      delayed by Doze). Used only to launch that dialog; falls back to the
+      battery-optimisation list if the OS declines the direct intent.
+    -->
+    <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
+
+    <!-- Package visibility (Android 11+): without this, getLaunchIntentForPackage
+         returns null and the calendar manager's per-account "manage" button can't
+         open the source sync app (DAVx5, ICSx5, Google Calendar, …). The LAUNCHER
+         intent makes launchable apps visible so we can launch whichever app owns a
+         calendar account's authenticator. -->
+    <queries>
+        <intent>
+            <action android:name="android.intent.action.MAIN" />
+            <category android:name="android.intent.category.LAUNCHER" />
+        </intent>
+    </queries>
 
     <application
         android:name=".CalendulaApp"
@@ -13,6 +32,7 @@
         android:fullBackupContent="@xml/backup_rules"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
+        android:localeConfig="@xml/locales_config"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.Calendula"
@@ -26,6 +46,26 @@
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
+
+            <!-- Open a .ics file (file manager / email attachment / browser). -->
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="content" android:mimeType="text/calendar" />
+                <data android:scheme="file" android:mimeType="text/calendar" />
+            </intent-filter>
+            <!-- Receive a .ics shared from another app. -->
+            <intent-filter>
+                <action android:name="android.intent.action.SEND" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data android:mimeType="text/calendar" />
+            </intent-filter>
+
+            <!-- Launcher long-press shortcuts (e.g. "New event"). -->
+            <meta-data
+                android:name="android.app.shortcuts"
+                android:resource="@xml/shortcuts" />
         </activity>
 
         <!-- The provider broadcasts EVENT_REMINDER at reminder time but posts
@@ -42,6 +82,64 @@
             </intent-filter>
         </receiver>
 
+        <!-- Home-screen widgets (Glance). Exported: the launcher/host binds them. -->
+        <receiver
+            android:name=".widget.agenda.AgendaWidgetReceiver"
+            android:label="@string/widget_agenda_label"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+            </intent-filter>
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/appwidget_info_agenda" />
+        </receiver>
+
+        <receiver
+            android:name=".widget.month.MonthWidgetReceiver"
+            android:label="@string/widget_month_label"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+            </intent-filter>
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/appwidget_info_month" />
+        </receiver>
+
+        <!-- Keeps both widgets fresh: the calendar provider broadcasts
+             PROVIDER_CHANGED on any data change (our writes and external sync),
+             and the system broadcasts the date/time ones at midnight / clock
+             changes so "today" highlighting rolls over. -->
+        <receiver
+            android:name=".widget.WidgetUpdateReceiver"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.PROVIDER_CHANGED" />
+                <data
+                    android:host="com.android.calendar"
+                    android:scheme="content" />
+            </intent-filter>
+            <intent-filter>
+                <action android:name="android.intent.action.DATE_CHANGED" />
+                <action android:name="android.intent.action.TIME_SET" />
+                <action android:name="android.intent.action.TIMEZONE_CHANGED" />
+            </intent-filter>
+        </receiver>
+
+        <!-- Hands .ics files we stage in the cache to other apps via a content
+             Uri (single-event share). Authority tracks applicationId so the
+             debug suffix doesn't break getUriForFile. -->
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths" />
+        </provider>
+
         <!-- Persists the per-app language (M4) on API < 33, where the platform
              per-app-languages API is unavailable. On 33+ this is a no-op. -->
         <service

app/src/main/java/de/jeanlucmakiola/calendula/MainActivity.kt

@@ -2,37 +2,51 @@ package de.jeanlucmakiola.calendula
 
 import android.content.Context
 import android.content.Intent
+import android.net.Uri
 import android.os.Bundle
-import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
 import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
+import androidx.core.content.IntentCompat
 import androidx.core.net.toUri
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import dagger.hilt.android.AndroidEntryPoint
 import de.jeanlucmakiola.calendula.data.prefs.ThemeMode
 import de.jeanlucmakiola.calendula.ui.RootScreen
+import de.jeanlucmakiola.calendula.ui.WidgetNavRequest
 import de.jeanlucmakiola.calendula.ui.settings.SettingsViewModel
 import de.jeanlucmakiola.calendula.ui.theme.CalendulaTheme
+import kotlinx.datetime.LocalDate
 
 @AndroidEntryPoint
-class MainActivity : ComponentActivity() {
+class MainActivity : AppCompatActivity() {
 
     // The occurrence a reminder notification was tapped for (eventId, begin,
     // end — the detail screen's key shape). singleTop + onNewIntent route a
     // tap into the running activity; CalendarHost consumes and clears it.
     private var requestedDetailKey by mutableStateOf<LongArray?>(null)
 
+    // A navigation a home-screen widget asked for (open a date / start a
+    // create). Consumed once by CalendarHost, same pattern as the detail key.
+    private var requestedNav by mutableStateOf<WidgetNavRequest?>(null)
+
+    // An .ics file opened/shared into the app (ACTION_VIEW/SEND). Consumed once
+    // by CalendarHost's import flow.
+    private var requestedImportUri by mutableStateOf<Uri?>(null)
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         enableEdgeToEdge()
         requestedDetailKey = intent.detailKeyOrNull()
+        requestedNav = intent.navRequestOrNull()
+        requestedImportUri = intent.importUriOrNull()
         setContent {
             // One activity-scoped SettingsViewModel drives both the theme here
             // and the Settings screen, so a theme change applies app-wide at once.
@@ -51,6 +65,10 @@ class MainActivity : ComponentActivity() {
                     modifier = Modifier.fillMaxSize(),
                     requestedDetailKey = requestedDetailKey,
                     onDetailKeyConsumed = { requestedDetailKey = null },
+                    widgetNavRequest = requestedNav,
+                    onWidgetNavConsumed = { requestedNav = null },
+                    requestedImportUri = requestedImportUri,
+                    onImportConsumed = { requestedImportUri = null },
                 )
             }
         }
@@ -59,6 +77,33 @@ class MainActivity : ComponentActivity() {
     override fun onNewIntent(intent: Intent) {
         super.onNewIntent(intent)
         intent.detailKeyOrNull()?.let { requestedDetailKey = it }
+        intent.navRequestOrNull()?.let { requestedNav = it }
+        intent.importUriOrNull()?.let { requestedImportUri = it }
+    }
+
+    /**
+     * The `.ics` Uri an external app asked us to open (file manager `ACTION_VIEW`)
+     * or share into us (`ACTION_SEND`). Restricted to content/file schemes so the
+     * app's own `calendula://` deep-links never match.
+     */
+    private fun Intent.importUriOrNull(): Uri? {
+        val uri = when (action) {
+            Intent.ACTION_VIEW -> data
+            Intent.ACTION_SEND -> IntentCompat.getParcelableExtra(this, Intent.EXTRA_STREAM, Uri::class.java)
+            else -> null
+        } ?: return null
+        return uri.takeIf { it.scheme == "content" || it.scheme == "file" }
+    }
+
+    private fun Intent.navRequestOrNull(): WidgetNavRequest? = when {
+        // Launcher long-press "New event" shortcut. Static shortcut intents
+        // can't carry typed extras, so the action alone signals create-on-today.
+        action == ACTION_NEW_EVENT -> WidgetNavRequest.Create(null)
+        getBooleanExtra(EXTRA_CREATE, false) ->
+            WidgetNavRequest.Create(getStringExtra(EXTRA_DATE_ISO))
+        getStringExtra(EXTRA_DATE_ISO) != null ->
+            WidgetNavRequest.OpenDate(getStringExtra(EXTRA_DATE_ISO)!!)
+        else -> null
     }
 
     private fun Intent.detailKeyOrNull(): LongArray? {
@@ -75,6 +120,12 @@ class MainActivity : ComponentActivity() {
         private const val EXTRA_EVENT_ID = "de.jeanlucmakiola.calendula.extra.EVENT_ID"
         private const val EXTRA_BEGIN_MILLIS = "de.jeanlucmakiola.calendula.extra.BEGIN"
         private const val EXTRA_END_MILLIS = "de.jeanlucmakiola.calendula.extra.END"
+        private const val EXTRA_DATE_ISO = "de.jeanlucmakiola.calendula.extra.DATE_ISO"
+        private const val EXTRA_CREATE = "de.jeanlucmakiola.calendula.extra.CREATE"
+
+        // Fired by the launcher long-press "New event" shortcut (res/xml/
+        // shortcuts.xml hardcodes this string — keep the two in sync).
+        const val ACTION_NEW_EVENT = "de.jeanlucmakiola.calendula.action.NEW_EVENT"
 
         /**
          * Intent opening the detail screen of one occurrence (reminder
@@ -93,5 +144,22 @@ class MainActivity : ComponentActivity() {
             putExtra(EXTRA_END_MILLIS, endMillis)
             addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
         }
+
+        /** Open the day view anchored on [date] (home-screen widgets). */
+        fun openDateIntent(context: Context, date: LocalDate): Intent =
+            Intent(context, MainActivity::class.java).apply {
+                data = "calendula://date/$date".toUri()
+                putExtra(EXTRA_DATE_ISO, date.toString())
+                addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            }
+
+        /** Open the create-event form prefilled for [date] (home-screen widgets). */
+        fun openCreateIntent(context: Context, date: LocalDate): Intent =
+            Intent(context, MainActivity::class.java).apply {
+                data = "calendula://create/$date".toUri()
+                putExtra(EXTRA_CREATE, true)
+                putExtra(EXTRA_DATE_ISO, date.toString())
+                addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            }
     }
 }

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/AllDayReminderEncoding.kt

@@ -0,0 +1,70 @@
+package de.jeanlucmakiola.calendula.data.calendar
+
+import java.time.Instant
+import java.time.LocalDate
+import java.time.LocalTime
+import java.time.ZoneId
+import java.time.ZoneOffset
+import java.time.temporal.ChronoUnit
+
+/**
+ * Translates an all-day reminder between the **semantic** lead time the UI
+ * speaks (whole days before the event — "1 day before") and the **raw**
+ * `CalendarContract.Reminders.MINUTES` offset the provider stores.
+ *
+ * Calendula schedules no alarms itself: the provider fires a reminder at
+ * `DTSTART − MINUTES` (the Etar model). An all-day event's DTSTART is **UTC
+ * midnight** (see [EventWriteTimes]), so a raw `MINUTES = 1440` ("1 day") lands
+ * on UTC-midnight of the previous day — 02:00 local in CEST, not the morning.
+ *
+ * To fire at a chosen wall-clock time we encode that time *into* the offset:
+ * `MINUTES = UTC-midnight(startDate) − (localInstant of [timeOfDayMinutes] on the
+ * day [semanticMinutes] before)`. The single fixed offset can only be tuned for
+ * the event's own date, so a recurring all-day series or a post-creation
+ * timezone change drifts the fire time by the offset delta (±1h across DST) —
+ * an inherent limit of the provider model, shared by Etar.
+ */
+private const val MINUTES_PER_DAY = 1_440
+private const val MILLIS_PER_MINUTE = 60_000L
+
+/**
+ * Raw provider `MINUTES` for an all-day reminder set [semanticMinutes] before the
+ * event (a whole-day multiple; sub-day remainders are dropped), so it fires at
+ * [timeOfDayMinutes] (minutes from local midnight) in [zone]. The result may be
+ * **negative** — e.g. "at time of event" at 09:00 CEST encodes to −420, meaning
+ * the provider fires *after* DTSTART; this is valid and must not be clamped.
+ * A negative [semanticMinutes] is the "provider default" sentinel and passes
+ * through unchanged.
+ */
+internal fun toProviderAllDayMinutes(
+    semanticMinutes: Int,
+    startDate: LocalDate,
+    zone: ZoneId,
+    timeOfDayMinutes: Int,
+): Int {
+    if (semanticMinutes < 0) return semanticMinutes
+    val utcMidnight = startDate.atStartOfDay(ZoneOffset.UTC).toInstant().toEpochMilli()
+    val fire = startDate.minusDays((semanticMinutes / MINUTES_PER_DAY).toLong())
+        .atTime(LocalTime.of(timeOfDayMinutes / 60, timeOfDayMinutes % 60))
+        .atZone(zone).toInstant().toEpochMilli()
+    return ((utcMidnight - fire) / MILLIS_PER_MINUTE).toInt()
+}
+
+/**
+ * Recover the semantic whole-day lead time from a raw all-day reminder
+ * [rawMinutes]. Keys off the **local date** of the encoded fire instant, so it
+ * returns the right day count regardless of which [timeOfDayMinutes] wrote the
+ * row — including pre-feature rows (raw multiples of 1440, fired at UTC midnight)
+ * and rows written under a different timezone. A negative [rawMinutes] (fire
+ * after DTSTART) folds to day 0.
+ */
+internal fun fromProviderAllDayMinutes(
+    rawMinutes: Int,
+    startDate: LocalDate,
+    zone: ZoneId,
+): Int {
+    val utcMidnight = startDate.atStartOfDay(ZoneOffset.UTC).toInstant().toEpochMilli()
+    val fireLocalDate = Instant.ofEpochMilli(utcMidnight - rawMinutes * MILLIS_PER_MINUTE)
+        .atZone(zone).toLocalDate()
+    return ChronoUnit.DAYS.between(fireLocalDate, startDate).toInt() * MINUTES_PER_DAY
+}

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/CalendarDataSource.kt

@@ -6,6 +6,7 @@ import android.content.ContentValues
 import android.content.Context
 import android.database.ContentObserver
 import android.database.Cursor
+import android.net.Uri
 import android.os.Handler
 import android.os.Looper
 import android.provider.CalendarContract
@@ -13,13 +14,19 @@ import android.util.Log
 import dagger.hilt.android.qualifiers.ApplicationContext
 import de.jeanlucmakiola.calendula.domain.Attendee
 import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.EventColorOption
 import de.jeanlucmakiola.calendula.domain.EventDetail
 import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.EventStatus
 import de.jeanlucmakiola.calendula.domain.Reminder
+import de.jeanlucmakiola.calendula.domain.ics.IcsEvent
+import de.jeanlucmakiola.calendula.domain.ics.ParsedIcsEvent
 import de.jeanlucmakiola.calendula.domain.rruleTruncatedAt
+import kotlinx.datetime.toJavaLocalDate
 import java.time.ZoneId
 import java.time.ZoneOffset
+import java.util.UUID
 import javax.inject.Inject
 import javax.inject.Singleton
 
@@ -36,24 +43,82 @@ interface CalendarDataSource {
     fun instances(beginMillis: Long, endMillis: Long): List<EventInstance>
     fun eventDetail(eventId: Long): EventDetail?
 
-    /** Insert a new event; returns the new `Events._ID`. */
-    fun insertEvent(form: EventForm): Long
+    /**
+     * The event-colour palette the calendar's account publishes
+     * (`CalendarContract.Colors`, `TYPE_EVENT`), sorted by key. Empty when the
+     * account exposes no palette (most local calendars, some CalDAV) — the
+     * signal that a custom colour can only be written as a raw `EVENT_COLOR`,
+     * which a synced calendar may drop on its next sync.
+     */
+    fun eventColorPalette(calendarId: Long): List<EventColorOption>
+
+    /**
+     * Every master/one-off event of the writable local calendars, mapped for a
+     * whole-calendar `.ics` backup. Modified-occurrence and cancelled-exception
+     * rows are excluded (see [EventExportProjection]).
+     */
+    fun exportableEvents(): List<IcsEvent>
+
+    /**
+     * The non-empty `Events.UID_2445` values present in [calendarId] — used to
+     * dedup an `.ics` import so re-importing a backup doesn't double events.
+     */
+    fun existingUids(calendarId: Long): Set<String>
+
+    /**
+     * Insert a parsed `.ics` event into [calendarId], preserving its UID (or
+     * minting one when absent); returns the new `Events._ID`. Reminders are
+     * written as the file's raw lead minutes (METHOD_ALERT).
+     */
+    fun insertImportedEvent(event: ParsedIcsEvent, calendarId: Long): Long
+
+    /**
+     * Create a new device-only (`ACCOUNT_TYPE_LOCAL`) calendar the app owns;
+     * returns its `Calendars._ID`. Inserted through the sync-adapter URI so the
+     * provider keeps the row (a plain insert is rejected for the LOCAL account).
+     */
+    fun createLocalCalendar(displayName: String, color: Int, description: String?): Long
+
+    /** Update name, color and description of a local calendar the app owns. */
+    fun updateCalendar(id: Long, displayName: String, color: Int, description: String?)
+
+    /** Permanently delete a local calendar the app owns, with all its events. */
+    fun deleteCalendar(id: Long)
+
+    /**
+     * Insert a new event; returns the new `Events._ID`. [allDayReminderTimeMinutes]
+     * (minutes from local midnight) is the wall-clock time all-day reminders
+     * should fire at — encoded into each all-day reminder's provider offset
+     * (ignored for timed events).
+     */
+    fun insertEvent(form: EventForm, allDayReminderTimeMinutes: Int): Long
 
     /**
      * Update an existing event (for recurring events: the whole series) to
      * match [updated]. [original] is the form as it was prefilled from the
      * event, so only fields the user actually changed are written and the
      * reminder rows can be diffed instead of wiped.
+     * [allDayReminderTimeMinutes]: see [insertEvent].
      */
-    fun updateEvent(eventId: Long, original: EventForm, updated: EventForm)
+    fun updateEvent(
+        eventId: Long,
+        original: EventForm,
+        updated: EventForm,
+        allDayReminderTimeMinutes: Int,
+    )
 
     /**
      * Change a single occurrence of a recurring event by inserting a
      * modified-occurrence exception at [beginMillis] (the occurrence's
      * `Instances.BEGIN`) carrying [form]'s values; returns the exception
-     * row's `Events._ID`.
+     * row's `Events._ID`. [allDayReminderTimeMinutes]: see [insertEvent].
      */
-    fun updateOccurrence(eventId: Long, beginMillis: Long, form: EventForm): Long
+    fun updateOccurrence(
+        eventId: Long,
+        beginMillis: Long,
+        form: EventForm,
+        allDayReminderTimeMinutes: Int,
+    ): Long
 
     /**
      * Change a recurring event from the occurrence at [beginMillis] onwards
@@ -68,6 +133,7 @@ interface CalendarDataSource {
         beginMillis: Long,
         original: EventForm,
         updated: EventForm,
+        allDayReminderTimeMinutes: Int,
     ): Long
 
     /**
@@ -105,6 +171,76 @@ class AndroidCalendarDataSource @Inject constructor(
         CalendarContract.Calendars.CALENDAR_DISPLAY_NAME + " ASC",
     )?.use { it.mapAll(::toCalendarSource) } ?: emptyList()
 
+    /**
+     * Calendar-row writes must address the provider as a sync adapter and name
+     * the account in the URI; otherwise inserts/deletes for the LOCAL account
+     * are silently dropped or only soft-deleted.
+     */
+    private fun localCalendarsUri(): Uri = CalendarContract.Calendars.CONTENT_URI.buildUpon()
+        .appendQueryParameter(CalendarContract.CALLER_IS_SYNCADAPTER, "true")
+        .appendQueryParameter(CalendarContract.Calendars.ACCOUNT_NAME, LOCAL_ACCOUNT_NAME)
+        .appendQueryParameter(
+            CalendarContract.Calendars.ACCOUNT_TYPE,
+            CalendarContract.ACCOUNT_TYPE_LOCAL,
+        )
+        .build()
+
+    override fun createLocalCalendar(displayName: String, color: Int, description: String?): Long {
+        val name = displayName.trim().ifEmpty { Fallbacks.UNNAMED_CALENDAR }
+        val values = ContentValues().apply {
+            put(CalendarContract.Calendars.ACCOUNT_NAME, LOCAL_ACCOUNT_NAME)
+            put(CalendarContract.Calendars.ACCOUNT_TYPE, CalendarContract.ACCOUNT_TYPE_LOCAL)
+            put(CalendarContract.Calendars.OWNER_ACCOUNT, LOCAL_ACCOUNT_NAME)
+            // NAME is the sync-adapter id; DISPLAY_NAME is what the user sees.
+            put(CalendarContract.Calendars.NAME, name)
+            put(CalendarContract.Calendars.CALENDAR_DISPLAY_NAME, name)
+            put(CalendarContract.Calendars.CALENDAR_COLOR, color)
+            put(
+                CalendarContract.Calendars.CALENDAR_ACCESS_LEVEL,
+                CalendarContract.Calendars.CAL_ACCESS_OWNER,
+            )
+            put(CalendarContract.Calendars.VISIBLE, 1)
+            put(CalendarContract.Calendars.SYNC_EVENTS, 1)
+            putDescription(description)
+        }
+        val uri = resolver.insert(localCalendarsUri(), values)
+            ?: throw WriteFailedException("create local calendar '$name'")
+        return ContentUris.parseId(uri)
+    }
+
+    override fun updateCalendar(id: Long, displayName: String, color: Int, description: String?) {
+        val name = displayName.trim().ifEmpty { Fallbacks.UNNAMED_CALENDAR }
+        val values = ContentValues().apply {
+            put(CalendarContract.Calendars.CALENDAR_DISPLAY_NAME, name)
+            put(CalendarContract.Calendars.NAME, name)
+            put(CalendarContract.Calendars.CALENDAR_COLOR, color)
+            putDescription(description)
+        }
+        val rows = resolver.update(
+            ContentUris.withAppendedId(localCalendarsUri(), id),
+            values, null, null,
+        )
+        if (rows == 0) throw WriteFailedException("update calendar id=$id")
+    }
+
+    /** Store the description in CAL_SYNC1, or clear it when blank/absent. */
+    private fun ContentValues.putDescription(description: String?) {
+        val text = description?.trim().orEmpty()
+        if (text.isEmpty()) {
+            putNull(CalendarProjection.DESCRIPTION_COLUMN)
+        } else {
+            put(CalendarProjection.DESCRIPTION_COLUMN, text)
+        }
+    }
+
+    override fun deleteCalendar(id: Long) {
+        val deleted = resolver.delete(
+            ContentUris.withAppendedId(localCalendarsUri(), id),
+            null, null,
+        )
+        if (deleted == 0) throw WriteFailedException("delete calendar id=$id")
+    }
+
     override fun instances(beginMillis: Long, endMillis: Long): List<EventInstance> {
         val uri = CalendarContract.Instances.CONTENT_URI.buildUpon().apply {
             ContentUris.appendId(this, beginMillis)
@@ -131,13 +267,190 @@ class AndroidCalendarDataSource @Inject constructor(
         }
     }
 
-    override fun insertEvent(form: EventForm): Long {
+    override fun eventColorPalette(calendarId: Long): List<EventColorOption> {
+        val account = calendarAccount(calendarId) ?: return emptyList()
+        return resolver.query(
+            CalendarContract.Colors.CONTENT_URI,
+            arrayOf(CalendarContract.Colors.COLOR_KEY, CalendarContract.Colors.COLOR),
+            CalendarContract.Colors.ACCOUNT_NAME + " = ? AND " +
+                CalendarContract.Colors.ACCOUNT_TYPE + " = ? AND " +
+                CalendarContract.Colors.COLOR_TYPE + " = ?",
+            arrayOf(
+                account.name,
+                account.type,
+                CalendarContract.Colors.TYPE_EVENT.toString(),
+            ),
+            null,
+        )?.use { c ->
+            c.mapAll { EventColorOption(key = it.getString(0).orEmpty(), argb = it.getInt(1)) }
+        }
+            ?.filter { it.key.isNotEmpty() }
+            ?.sortedBy { it.key }
+            ?: emptyList()
+    }
+
+    override fun exportableEvents(): List<IcsEvent> {
+        // Only the local calendars the app owns and can write — synced calendars
+        // already have a backup (their server). Map id → display name for the
+        // X-CALENDULA-CALENDAR tag a restore uses to fan back out.
+        val names = calendars()
+            .filter { it.isLocal && it.canModifyContents }
+            .associate { it.id to it.displayName }
+        if (names.isEmpty()) return emptyList()
+
+        val idList = names.keys.joinToString(",")
+        return resolver.query(
+            CalendarContract.Events.CONTENT_URI,
+            EventExportProjection.COLUMNS,
+            // Skip soft-deleted rows and exception rows (modified occurrences /
+            // cancellations) — v1 exports masters + one-offs only.
+            "${CalendarContract.Events.CALENDAR_ID} IN ($idList) AND " +
+                "${CalendarContract.Events.DELETED} = 0 AND " +
+                "${CalendarContract.Events.ORIGINAL_ID} IS NULL",
+            null,
+            CalendarContract.Events.DTSTART + " ASC",
+        )?.use { c ->
+            c.mapAll {
+                val reader = CursorColumnReader(c)
+                val eventId = reader.getLong(EventExportProjection.IDX_ID)
+                val calendarId = reader.getLong(EventExportProjection.IDX_CALENDAR_ID)
+                reader.toIcsEvent(
+                    reminderMinutes = queryReminders(eventId).map { it.minutes },
+                    calendarName = names[calendarId],
+                )
+            }
+        } ?: emptyList()
+    }
+
+    override fun existingUids(calendarId: Long): Set<String> = resolver.query(
+        CalendarContract.Events.CONTENT_URI,
+        arrayOf(CalendarContract.Events.UID_2445),
+        "${CalendarContract.Events.CALENDAR_ID} = ? AND " +
+            "${CalendarContract.Events.UID_2445} IS NOT NULL",
+        arrayOf(calendarId.toString()),
+        null,
+    )?.use { c ->
+        buildSet { while (c.moveToNext()) c.getString(0)?.takeIf { it.isNotEmpty() }?.let(::add) }
+    } ?: emptySet()
+
+    override fun insertImportedEvent(event: ParsedIcsEvent, calendarId: Long): Long {
+        val startMillis = event.start.toEpochMillis()
+        val endMillis = event.end.toEpochMillis()
+        val values = ContentValues().apply {
+            put(CalendarContract.Events.CALENDAR_ID, calendarId)
+            // Preserve the file's UID so a re-import dedups against it; mint one
+            // only when the source event carried none.
+            put(
+                CalendarContract.Events.UID_2445,
+                event.uid?.takeIf { it.isNotBlank() } ?: "${UUID.randomUUID()}@calendula",
+            )
+            put(CalendarContract.Events.TITLE, event.summary.trim())
+            put(CalendarContract.Events.ALL_DAY, if (event.isAllDay) 1 else 0)
+            put(CalendarContract.Events.DTSTART, startMillis)
+            if (event.recurrenceRule == null) {
+                put(CalendarContract.Events.DTEND, endMillis)
+            } else {
+                put(CalendarContract.Events.RRULE, event.recurrenceRule)
+                put(
+                    CalendarContract.Events.DURATION,
+                    importDuration(startMillis, endMillis, event.isAllDay),
+                )
+            }
+            // All-day rows live at UTC midnights (the file already encodes them so);
+            // timed rows keep the event's own zone.
+            put(CalendarContract.Events.EVENT_TIMEZONE, if (event.isAllDay) "UTC" else event.zoneId)
+            put(CalendarContract.Events.AVAILABILITY, event.availability.toProviderValue())
+            put(CalendarContract.Events.STATUS, event.status.toProviderStatus())
+            event.location?.trim()?.takeIf { it.isNotEmpty() }
+                ?.let { put(CalendarContract.Events.EVENT_LOCATION, it) }
+            event.description?.trim()?.takeIf { it.isNotEmpty() }
+                ?.let { put(CalendarContract.Events.DESCRIPTION, it) }
+        }
+        val uri = resolver.insert(CalendarContract.Events.CONTENT_URI, values)
+            ?: throw WriteFailedException("import event into calendar id=$calendarId")
+        val eventId = ContentUris.parseId(uri)
+        // Raw lead minutes straight from the file's VALARMs (best-effort, like insertEvent).
+        event.reminderMinutes.distinct().filter { it >= 0 }.forEach { minutes ->
+            val reminder = ContentValues().apply {
+                put(CalendarContract.Reminders.EVENT_ID, eventId)
+                put(CalendarContract.Reminders.MINUTES, minutes)
+                put(CalendarContract.Reminders.METHOD, CalendarContract.Reminders.METHOD_ALERT)
+            }
+            if (resolver.insert(CalendarContract.Reminders.CONTENT_URI, reminder) == null) {
+                Log.w(TAG, "Failed to attach reminder ($minutes min) to imported event $eventId")
+            }
+        }
+        return eventId
+    }
+
+    /** Provider DURATION for an imported recurring row: whole days / seconds. */
+    private fun importDuration(startMillis: Long, endMillis: Long, isAllDay: Boolean): String {
+        val span = (endMillis - startMillis).coerceAtLeast(0)
+        return if (isAllDay) "P${span / 86_400_000L}D" else "P${span / 1_000L}S"
+    }
+
+    private fun EventStatus.toProviderStatus(): Int = when (this) {
+        EventStatus.Confirmed -> CalendarContract.Events.STATUS_CONFIRMED
+        EventStatus.Tentative -> CalendarContract.Events.STATUS_TENTATIVE
+        EventStatus.Cancelled -> CalendarContract.Events.STATUS_CANCELED
+    }
+
+    /** The account a calendar belongs to, for scoping a `Colors` lookup. */
+    private fun calendarAccount(calendarId: Long): CalendarAccount? = resolver.query(
+        ContentUris.withAppendedId(CalendarContract.Calendars.CONTENT_URI, calendarId),
+        arrayOf(
+            CalendarContract.Calendars.ACCOUNT_NAME,
+            CalendarContract.Calendars.ACCOUNT_TYPE,
+        ),
+        null, null, null,
+    )?.use { c ->
+        if (c.moveToFirst()) {
+            CalendarAccount(name = c.getString(0).orEmpty(), type = c.getString(1).orEmpty())
+        } else {
+            null
+        }
+    }
+
+    private data class CalendarAccount(val name: String, val type: String)
+
+    /**
+     * The raw provider `MINUTES` to store for one of [form]'s reminders: an
+     * all-day reminder is shifted to fire at [allDayReminderTimeMinutes] local
+     * (see [toProviderAllDayMinutes]); a timed reminder is its lead time as-is.
+     */
+    private fun providerReminderMinutes(
+        form: EventForm,
+        minutes: Int,
+        allDayReminderTimeMinutes: Int,
+    ): Int = if (form.isAllDay) {
+        toProviderAllDayMinutes(
+            semanticMinutes = minutes,
+            startDate = form.start.date.toJavaLocalDate(),
+            zone = ZoneId.systemDefault(),
+            timeOfDayMinutes = allDayReminderTimeMinutes,
+        )
+    } else {
+        minutes
+    }
+
+    /** [form]'s reminders as the distinct raw provider offsets to store. */
+    private fun encodedReminders(form: EventForm, allDayReminderTimeMinutes: Int): List<Int> =
+        form.reminders
+            .map { providerReminderMinutes(form, it, allDayReminderTimeMinutes) }
+            .distinct()
+
+    override fun insertEvent(form: EventForm, allDayReminderTimeMinutes: Int): Long {
         val times = form.toWriteTimes(ZoneId.systemDefault())
         val values = ContentValues().apply {
             put(
                 CalendarContract.Events.CALENDAR_ID,
                 requireNotNull(form.calendarId) { "EventForm.calendarId is required" },
             )
+            // A globally-unique UID so a later .ics backup/restore can identify
+            // the event and not duplicate it on re-import (the provider leaves
+            // this null for events it didn't sync). Older rows without one fall
+            // back to a stable synthesised UID at export time (deriveIcsUid).
+            put(CalendarContract.Events.UID_2445, "${UUID.randomUUID()}@calendula")
             put(CalendarContract.Events.TITLE, form.title.trim())
             put(CalendarContract.Events.ALL_DAY, if (form.isAllDay) 1 else 0)
             put(CalendarContract.Events.DTSTART, times.dtStartMillis)
@@ -156,13 +469,21 @@ class AndroidCalendarDataSource @Inject constructor(
                 ?.let { put(CalendarContract.Events.EVENT_LOCATION, it) }
             form.description.trim().takeIf { it.isNotEmpty() }
                 ?.let { put(CalendarContract.Events.DESCRIPTION, it) }
+            // A null colour just leaves both columns unset (the event inherits
+            // its calendar's colour), so only the key/raw cases are written.
+            when {
+                form.colorKey != null ->
+                    put(CalendarContract.Events.EVENT_COLOR_KEY, form.colorKey)
+                form.color != null -> put(CalendarContract.Events.EVENT_COLOR, form.color)
+            }
         }
         val uri = resolver.insert(CalendarContract.Events.CONTENT_URI, values)
             ?: throw WriteFailedException("insert event into calendar id=${form.calendarId}")
         val eventId = ContentUris.parseId(uri)
         // Best effort (spec §8): the event exists at this point — a reminder
         // that fails to attach is logged, not surfaced as a failed create.
-        form.reminders.distinct().forEach { minutes ->
+        encodedReminders(form, allDayReminderTimeMinutes)
+            .forEach { minutes ->
                 val reminder = ContentValues().apply {
                     put(CalendarContract.Reminders.EVENT_ID, eventId)
                     put(CalendarContract.Reminders.MINUTES, minutes)
@@ -175,7 +496,12 @@ class AndroidCalendarDataSource @Inject constructor(
         return eventId
     }
 
-    override fun updateEvent(eventId: Long, original: EventForm, updated: EventForm) {
+    override fun updateEvent(
+        eventId: Long,
+        original: EventForm,
+        updated: EventForm,
+        allDayReminderTimeMinutes: Int,
+    ) {
         val values = buildEventUpdateValues(
             original = original,
             updated = updated,
@@ -191,13 +517,19 @@ class AndroidCalendarDataSource @Inject constructor(
             if (rows == 0) throw WriteFailedException("update event id=$eventId")
         }
         // Untouched reminder sets are left alone so unrelated edits can't
-        // disturb provider rows the form never knew about.
+        // disturb provider rows the form never knew about. The diff is on the
+        // form's semantic minutes; reconcile works in encoded provider minutes.
         if (updated.reminders.toSet() != original.reminders.toSet()) {
-            reconcileReminders(eventId, updated.reminders)
+            reconcileReminders(eventId, encodedReminders(updated, allDayReminderTimeMinutes))
         }
     }
 
-    override fun updateOccurrence(eventId: Long, beginMillis: Long, form: EventForm): Long {
+    override fun updateOccurrence(
+        eventId: Long,
+        beginMillis: Long,
+        form: EventForm,
+        allDayReminderTimeMinutes: Int,
+    ): Long {
         // The provider clones the series row and applies these values on top.
         val values = buildOccurrenceExceptionValues(
             form = form,
@@ -211,7 +543,7 @@ class AndroidCalendarDataSource @Inject constructor(
         val exceptionId = ContentUris.parseId(uri)
         // Whether the provider copied the parent's reminder rows is its
         // business — reconciling against the actual rows handles both ways.
-        reconcileReminders(exceptionId, form.reminders)
+        reconcileReminders(exceptionId, encodedReminders(form, allDayReminderTimeMinutes))
         return exceptionId
     }
 
@@ -220,16 +552,17 @@ class AndroidCalendarDataSource @Inject constructor(
         beginMillis: Long,
         original: EventForm,
         updated: EventForm,
+        allDayReminderTimeMinutes: Int,
     ): Long {
         val row = querySeriesRow(eventId)
         // From the first occurrence on (or with no rule to split) this is
         // just a series update.
         if (row.rrule.isNullOrBlank() || beginMillis <= row.dtStartMillis) {
-            updateEvent(eventId, original, updated)
+            updateEvent(eventId, original, updated, allDayReminderTimeMinutes)
             return eventId
         }
         // Insert the new series first: if it fails, the original is untouched.
-        val newEventId = insertEvent(updated)
+        val newEventId = insertEvent(updated, allDayReminderTimeMinutes)
         truncateSeries(eventId, row, beginMillis)
         return newEventId
     }
@@ -315,9 +648,11 @@ class AndroidCalendarDataSource @Inject constructor(
     }
 
     /**
-     * Make the event's reminder rows match [targetMinutes]: rows with other
-     * lead times are deleted, missing ones inserted as best-effort ALERTs
-     * (like insertEvent). Rows whose minutes survive keep their method.
+     * Make the event's reminder rows match [targetMinutes] — the raw provider
+     * offsets to store (already encoded via [encodedReminders], so all-day shifts
+     * are baked in and the diff matches the stored rows). Rows with other offsets
+     * are deleted, missing ones inserted as best-effort ALERTs (like insertEvent).
+     * Rows whose minutes survive keep their method.
      */
     private fun reconcileReminders(eventId: Long, targetMinutes: List<Int>) {
         val target = targetMinutes.toSet()
@@ -425,5 +760,11 @@ class AndroidCalendarDataSource @Inject constructor(
 
     private companion object {
         const val TAG = "CalendarDataSource"
+
+        /**
+         * Shared account for every app-created local calendar, so they group
+         * together (by account) in the filter sheet and calendar manager.
+         */
+        const val LOCAL_ACCOUNT_NAME = "Calendula"
     }
 }

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/CalendarMapper.kt

@@ -3,14 +3,26 @@ package de.jeanlucmakiola.calendula.data.calendar
 import android.provider.CalendarContract
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 
-internal fun ColumnReader.toCalendarSource(): CalendarSource = CalendarSource(
+internal fun ColumnReader.toCalendarSource(): CalendarSource {
+    val accountType = getString(CalendarProjection.IDX_ACCOUNT_TYPE).orEmpty()
+    val isLocal = accountType == CalendarContract.ACCOUNT_TYPE_LOCAL
+    return CalendarSource(
         id = getLong(CalendarProjection.IDX_ID),
         displayName = getString(CalendarProjection.IDX_DISPLAY_NAME)
             ?: Fallbacks.UNNAMED_CALENDAR,
         accountName = getString(CalendarProjection.IDX_ACCOUNT_NAME).orEmpty(),
-    accountType = getString(CalendarProjection.IDX_ACCOUNT_TYPE).orEmpty(),
+        accountType = accountType,
         color = getInt(CalendarProjection.IDX_COLOR),
         isVisibleInSystem = getInt(CalendarProjection.IDX_VISIBLE) != 0,
         canModifyContents = getInt(CalendarProjection.IDX_ACCESS_LEVEL) >=
             CalendarContract.Calendars.CAL_ACCESS_CONTRIBUTOR,
-)
+        isLocal = isLocal,
+        // CAL_SYNC1 holds the sync token for synced rows, so only treat it as a
+        // user description on the local calendars the app owns.
+        description = if (isLocal) {
+            getString(CalendarProjection.IDX_DESCRIPTION)?.takeIf { it.isNotBlank() }
+        } else {
+            null
+        },
+    )
+}

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/CalendarRepository.kt

@@ -1,9 +1,13 @@
 package de.jeanlucmakiola.calendula.data.calendar
 
 import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.EventColorOption
 import de.jeanlucmakiola.calendula.domain.EventDetail
 import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.ics.IcsEvent
+import de.jeanlucmakiola.calendula.domain.ics.IcsImportSummary
+import de.jeanlucmakiola.calendula.domain.ics.ParsedIcsEvent
 import kotlinx.coroutines.flow.Flow
 import kotlin.time.Instant
 
@@ -12,6 +16,34 @@ interface CalendarRepository {
     fun instances(range: ClosedRange<Instant>): Flow<List<EventInstance>>
     suspend fun eventDetail(eventId: Long): EventDetail
 
+    /**
+     * The event-colour palette a calendar's account publishes; empty when it
+     * exposes none (see [CalendarDataSource.eventColorPalette]).
+     */
+    suspend fun eventColorPalette(calendarId: Long): List<EventColorOption>
+
+    /** Create a device-only (LOCAL) calendar the app owns; returns its id. */
+    suspend fun createLocalCalendar(displayName: String, color: Int, description: String?): Long
+
+    /** Update name, color and description of a local calendar the app owns. */
+    suspend fun updateCalendar(id: Long, displayName: String, color: Int, description: String?)
+
+    /** Permanently delete a local calendar the app owns, with all its events. */
+    suspend fun deleteCalendar(id: Long)
+
+    /**
+     * Every event of the writable local calendars, ready to serialise into a
+     * whole-calendar `.ics` backup (see [CalendarDataSource.exportableEvents]).
+     */
+    suspend fun exportEvents(): List<IcsEvent>
+
+    /**
+     * Bulk-import parsed `.ics` [events] into [targetCalendarId]. Events whose
+     * UID already exists in the target are skipped (idempotent restore); the
+     * rest are inserted. See [CalendarDataSource.insertImportedEvent].
+     */
+    suspend fun importEvents(targetCalendarId: Long, events: List<ParsedIcsEvent>): IcsImportSummary
+
     /** Create a new event from a validated form; returns the new `Events._ID`. */
     suspend fun createEvent(form: EventForm): Long
 

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/CalendarRepositoryImpl.kt

@@ -2,14 +2,19 @@ package de.jeanlucmakiola.calendula.data.calendar
 
 import de.jeanlucmakiola.calendula.data.di.IoDispatcher
 import de.jeanlucmakiola.calendula.data.prefs.CalendarPrefs
+import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
 import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.EventColorOption
 import de.jeanlucmakiola.calendula.domain.EventDetail
 import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.ics.IcsImportSummary
+import de.jeanlucmakiola.calendula.domain.ics.ParsedIcsEvent
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.onStart
@@ -27,9 +32,14 @@ import javax.inject.Singleton
 class CalendarRepositoryImpl @Inject constructor(
     private val dataSource: CalendarDataSource,
     private val prefs: CalendarPrefs,
+    private val settingsPrefs: SettingsPrefs,
     @IoDispatcher private val io: CoroutineDispatcher,
 ) : CalendarRepository {
 
+    /** The configured wall-clock fire time for all-day reminders, read per write. */
+    private suspend fun allDayReminderTimeMinutes(): Int =
+        settingsPrefs.allDayReminderTimeMinutes.first()
+
     private val ticks = MutableSharedFlow<Unit>(
         replay = 0,
         extraBufferCapacity = 1,
@@ -70,8 +80,51 @@ class CalendarRepositoryImpl @Inject constructor(
         dataSource.eventDetail(eventId) ?: throw NoSuchEventException(eventId)
     }
 
+    override suspend fun eventColorPalette(calendarId: Long): List<EventColorOption> =
+        withContext(io) { dataSource.eventColorPalette(calendarId) }
+
+    override suspend fun createLocalCalendar(
+        displayName: String,
+        color: Int,
+        description: String?,
+    ): Long = withContext(io) {
+        dataSource.createLocalCalendar(displayName, color, description)
+    }
+
+    override suspend fun updateCalendar(
+        id: Long,
+        displayName: String,
+        color: Int,
+        description: String?,
+    ) = withContext(io) { dataSource.updateCalendar(id, displayName, color, description) }
+
+    override suspend fun deleteCalendar(id: Long) =
+        withContext(io) { dataSource.deleteCalendar(id) }
+
+    override suspend fun exportEvents() = withContext(io) { dataSource.exportableEvents() }
+
+    override suspend fun importEvents(
+        targetCalendarId: Long,
+        events: List<ParsedIcsEvent>,
+    ): IcsImportSummary = withContext(io) {
+        val existing = dataSource.existingUids(targetCalendarId)
+        var imported = 0
+        var skipped = 0
+        for (event in events) {
+            // A known UID means the event is already in this calendar — skip,
+            // keeping a restore idempotent (no overwrite this pass).
+            if (event.uid != null && event.uid in existing) {
+                skipped++
+            } else {
+                dataSource.insertImportedEvent(event, targetCalendarId)
+                imported++
+            }
+        }
+        IcsImportSummary(imported = imported, skippedDuplicate = skipped)
+    }
+
     override suspend fun createEvent(form: EventForm): Long = withContext(io) {
-        dataSource.insertEvent(form)
+        dataSource.insertEvent(form, allDayReminderTimeMinutes())
     }
 
     override suspend fun updateEvent(
@@ -79,7 +132,7 @@ class CalendarRepositoryImpl @Inject constructor(
         original: EventForm,
         updated: EventForm,
     ) = withContext(io) {
-        dataSource.updateEvent(eventId, original, updated)
+        dataSource.updateEvent(eventId, original, updated, allDayReminderTimeMinutes())
     }
 
     override suspend fun deleteEvent(eventId: Long) = withContext(io) {
@@ -91,7 +144,7 @@ class CalendarRepositoryImpl @Inject constructor(
         beginMillis: Long,
         form: EventForm,
     ): Long = withContext(io) {
-        dataSource.updateOccurrence(eventId, beginMillis, form)
+        dataSource.updateOccurrence(eventId, beginMillis, form, allDayReminderTimeMinutes())
     }
 
     override suspend fun updateEventFromOccurrence(
@@ -100,7 +153,9 @@ class CalendarRepositoryImpl @Inject constructor(
         original: EventForm,
         updated: EventForm,
     ): Long = withContext(io) {
-        dataSource.updateEventFromOccurrence(eventId, beginMillis, original, updated)
+        dataSource.updateEventFromOccurrence(
+            eventId, beginMillis, original, updated, allDayReminderTimeMinutes(),
+        )
     }
 
     override suspend fun deleteOccurrence(eventId: Long, beginMillis: Long) = withContext(io) {

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/EventDetailMapper.kt

@@ -13,6 +13,9 @@ import de.jeanlucmakiola.calendula.domain.EventInstance
 import de.jeanlucmakiola.calendula.domain.EventStatus
 import de.jeanlucmakiola.calendula.domain.Reminder
 import de.jeanlucmakiola.calendula.domain.ReminderMethod
+import java.time.Instant
+import java.time.ZoneId
+import java.time.ZoneOffset
 
 private const val TAG = "EventDetailMapper"
 
@@ -46,13 +49,19 @@ internal fun ColumnReader.toEventDetailCore(
     // localized placeholder, and the edit form must prefill the true value.
     val title = getString(EventDetailProjection.IDX_TITLE).orEmpty()
 
-    val color = if (isNull(EventDetailProjection.IDX_EVENT_COLOR)) {
-        getInt(EventDetailProjection.IDX_CALENDAR_COLOR)
+    // The event's own colour (null = inherits the calendar's) is kept apart
+    // from the resolved display colour: the edit form needs to tell the two
+    // cases apart, while the instance carries the calendar fallback for display.
+    val eventColor = if (isNull(EventDetailProjection.IDX_EVENT_COLOR)) {
+        null
     } else {
         getInt(EventDetailProjection.IDX_EVENT_COLOR)
     }
+    val eventColorKey = getString(EventDetailProjection.IDX_EVENT_COLOR_KEY)
+    val color = eventColor ?: getInt(EventDetailProjection.IDX_CALENDAR_COLOR)
 
     val eventId = getLong(EventDetailProjection.IDX_EVENT_ID)
+    val isAllDay = getInt(EventDetailProjection.IDX_ALL_DAY) != 0
     val instance = EventInstance(
         instanceId = eventId,
         eventId = eventId,
@@ -60,11 +69,23 @@ internal fun ColumnReader.toEventDetailCore(
         title = title,
         start = begin.toKotlinInstantFromEpochMillis(),
         end = end.toKotlinInstantFromEpochMillis(),
-        isAllDay = getInt(EventDetailProjection.IDX_ALL_DAY) != 0,
+        isAllDay = isAllDay,
         color = color,
         location = getString(EventDetailProjection.IDX_LOCATION),
     )
 
+    // All-day reminders are stored as a wall-clock-shifted offset (see
+    // AllDayReminderEncoding); decode back to the whole-day lead time the form
+    // and detail screen speak. DTSTART is UTC midnight for all-day events, so the
+    // event's date is its UTC date.
+    val displayReminders = if (isAllDay) {
+        val startDate = Instant.ofEpochMilli(begin).atZone(ZoneOffset.UTC).toLocalDate()
+        val zone = ZoneId.systemDefault()
+        reminders.map { it.copy(minutes = fromProviderAllDayMinutes(it.minutes, startDate, zone)) }
+    } else {
+        reminders
+    }
+
     // STATUS shares its 0 value with STATUS_TENTATIVE, so a missing column must
     // be distinguished from a present 0 — an absent status means "just confirmed".
     val status = if (isNull(EventDetailProjection.IDX_STATUS)) {
@@ -79,7 +100,7 @@ internal fun ColumnReader.toEventDetailCore(
         organizer = getString(EventDetailProjection.IDX_ORGANIZER),
         attendees = attendees,
         rrule = getString(EventDetailProjection.IDX_RRULE),
-        reminders = reminders,
+        reminders = displayReminders,
         status = status,
         // BUSY and DEFAULT are both 0, so a null column folds into the same
         // default these mappers already return — no isNull guard needed.
@@ -87,6 +108,8 @@ internal fun ColumnReader.toEventDetailCore(
         accessLevel = mapAccessLevel(getInt(EventDetailProjection.IDX_ACCESS_LEVEL)),
         eventTimezone = getString(EventDetailProjection.IDX_EVENT_TIMEZONE),
         selfStatus = mapAttendeeStatus(getInt(EventDetailProjection.IDX_SELF_ATTENDEE_STATUS)),
+        eventColor = eventColor,
+        eventColorKey = eventColorKey,
     )
 }
 

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/EventWriteMapper.kt

@@ -85,6 +85,9 @@ internal fun buildEventUpdateValues(
     if (updated.accessLevel != original.accessLevel) {
         put(CalendarContract.Events.ACCESS_LEVEL, updated.accessLevel.toProviderValue())
     }
+    if (updated.colorKey != original.colorKey || updated.color != original.color) {
+        putAll(eventColorColumns(updated.colorKey, updated.color))
+    }
 
     val timesChanged = updated.start != original.start ||
         updated.end != original.end ||
@@ -134,6 +137,28 @@ internal fun buildOccurrenceExceptionValues(
     put(CalendarContract.Events.ACCESS_LEVEL, form.accessLevel.toProviderValue())
     put(CalendarContract.Events.EVENT_LOCATION, form.location.trim().ifEmpty { null })
     put(CalendarContract.Events.DESCRIPTION, form.description.trim().ifEmpty { null })
+    putAll(eventColorColumns(form.colorKey, form.color))
+}
+
+/**
+ * The `EVENT_COLOR` / `EVENT_COLOR_KEY` columns for a colour selection. A
+ * [colorKey] writes the key alone (the provider derives `EVENT_COLOR` from the
+ * account's palette, so the colour round-trips through sync); a raw [color]
+ * writes `EVENT_COLOR` and clears any key; "no colour" clears both so the event
+ * falls back to its calendar's colour. The two are never written together —
+ * the provider rejects a raw colour on a calendar that publishes a palette,
+ * which is exactly why palette calendars only ever go through the key.
+ */
+internal fun eventColorColumns(colorKey: String?, color: Int?): Map<String, Any?> = when {
+    colorKey != null -> mapOf(CalendarContract.Events.EVENT_COLOR_KEY to colorKey)
+    color != null -> mapOf(
+        CalendarContract.Events.EVENT_COLOR_KEY to null,
+        CalendarContract.Events.EVENT_COLOR to color,
+    )
+    else -> mapOf(
+        CalendarContract.Events.EVENT_COLOR_KEY to null,
+        CalendarContract.Events.EVENT_COLOR to null,
+    )
 }
 
 /**

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/IcsExportMapper.kt

@@ -0,0 +1,54 @@
+package de.jeanlucmakiola.calendula.data.calendar
+
+import de.jeanlucmakiola.calendula.domain.EventStatus
+import de.jeanlucmakiola.calendula.domain.ics.IcsEvent
+import de.jeanlucmakiola.calendula.domain.ics.deriveIcsUid
+import de.jeanlucmakiola.calendula.domain.ics.parseRfc2445DurationMillis
+
+/**
+ * Map one Events row (read through [EventExportProjection]) into an [IcsEvent]
+ * for backup. [reminderMinutes] are the row's raw provider reminder offsets and
+ * [calendarName] the display name of its calendar (emitted as
+ * `X-CALENDULA-CALENDAR`). Pure given a [ColumnReader] — JVM-tested with
+ * MapColumnReader.
+ */
+internal fun ColumnReader.toIcsEvent(
+    reminderMinutes: List<Int>,
+    calendarName: String?,
+): IcsEvent {
+    val eventId = getLong(EventExportProjection.IDX_ID)
+    val dtStart = getLong(EventExportProjection.IDX_DTSTART)
+    val rrule = getString(EventExportProjection.IDX_RRULE)?.takeIf { it.isNotBlank() }
+
+    // Recurring rows store DURATION instead of DTEND; reconstruct the end from it
+    // so the writer can render DTEND. A missing/blank both means a zero-length event.
+    val end = when {
+        !isNull(EventExportProjection.IDX_DTEND) -> getLong(EventExportProjection.IDX_DTEND)
+        else -> dtStart + parseRfc2445DurationMillis(getString(EventExportProjection.IDX_DURATION))
+    }
+
+    // STATUS shares value 0 with TENTATIVE, so an absent column must read as Confirmed.
+    val status = if (isNull(EventExportProjection.IDX_STATUS)) {
+        EventStatus.Confirmed
+    } else {
+        mapEventStatus(getInt(EventExportProjection.IDX_STATUS))
+    }
+
+    return IcsEvent(
+        uid = deriveIcsUid(getString(EventExportProjection.IDX_UID), eventId, dtStart),
+        summary = getString(EventExportProjection.IDX_TITLE).orEmpty(),
+        start = dtStart.toKotlinInstantFromEpochMillis(),
+        end = end.toKotlinInstantFromEpochMillis(),
+        isAllDay = getInt(EventExportProjection.IDX_ALL_DAY) != 0,
+        zoneId = getString(EventExportProjection.IDX_EVENT_TIMEZONE)?.takeIf { it.isNotBlank() }
+            ?: "UTC",
+        recurrenceRule = rrule,
+        location = getString(EventExportProjection.IDX_LOCATION),
+        description = getString(EventExportProjection.IDX_DESCRIPTION),
+        reminderMinutes = reminderMinutes,
+        status = status,
+        availability = mapAvailability(getInt(EventExportProjection.IDX_AVAILABILITY)),
+        calendarName = calendarName,
+    )
+}
+

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/Projections.kt

@@ -11,8 +11,14 @@ internal object CalendarProjection {
         CalendarContract.Calendars.CALENDAR_COLOR,
         CalendarContract.Calendars.VISIBLE,
         CalendarContract.Calendars.CALENDAR_ACCESS_LEVEL,
+        // CalendarContract has no description column; for the local calendars we
+        // own we stash one in CAL_SYNC1 (synced rows put their sync token here,
+        // so the mapper only reads it for local calendars).
+        DESCRIPTION_COLUMN,
     )
 
+    const val DESCRIPTION_COLUMN: String = CalendarContract.Calendars.CAL_SYNC1
+
     const val IDX_ID = 0
     const val IDX_DISPLAY_NAME = 1
     const val IDX_ACCOUNT_NAME = 2
@@ -20,6 +26,7 @@ internal object CalendarProjection {
     const val IDX_COLOR = 4
     const val IDX_VISIBLE = 5
     const val IDX_ACCESS_LEVEL = 6
+    const val IDX_DESCRIPTION = 7
 }
 
 internal object InstanceProjection {
@@ -67,6 +74,7 @@ internal object EventDetailProjection {
         CalendarContract.Events.ACCESS_LEVEL,
         CalendarContract.Events.EVENT_TIMEZONE,
         CalendarContract.Events.SELF_ATTENDEE_STATUS,
+        CalendarContract.Events.EVENT_COLOR_KEY,
     )
 
     const val IDX_EVENT_ID = 0
@@ -86,6 +94,49 @@ internal object EventDetailProjection {
     const val IDX_ACCESS_LEVEL = 14
     const val IDX_EVENT_TIMEZONE = 15
     const val IDX_SELF_ATTENDEE_STATUS = 16
+    const val IDX_EVENT_COLOR_KEY = 17
+}
+
+/**
+ * Master/one-off Events rows for a whole-calendar backup. Unlike
+ * [EventDetailProjection] this reads `UID_2445` (to keep a row's identity across
+ * backups) and `DURATION` (recurring rows carry it instead of DTEND). Modified-
+ * occurrence and cancelled-exception rows are filtered out by the query
+ * (`ORIGINAL_ID IS NULL`), so RECURRENCE-ID overrides and EXDATEs aren't
+ * exported yet — a documented v1 limit (import skips them too).
+ */
+internal object EventExportProjection {
+    val COLUMNS: Array<String> = arrayOf(
+        CalendarContract.Events._ID,
+        CalendarContract.Events.UID_2445,
+        CalendarContract.Events.TITLE,
+        CalendarContract.Events.DTSTART,
+        CalendarContract.Events.DTEND,
+        CalendarContract.Events.DURATION,
+        CalendarContract.Events.ALL_DAY,
+        CalendarContract.Events.EVENT_TIMEZONE,
+        CalendarContract.Events.RRULE,
+        CalendarContract.Events.EVENT_LOCATION,
+        CalendarContract.Events.DESCRIPTION,
+        CalendarContract.Events.STATUS,
+        CalendarContract.Events.AVAILABILITY,
+        CalendarContract.Events.CALENDAR_ID,
+    )
+
+    const val IDX_ID = 0
+    const val IDX_UID = 1
+    const val IDX_TITLE = 2
+    const val IDX_DTSTART = 3
+    const val IDX_DTEND = 4
+    const val IDX_DURATION = 5
+    const val IDX_ALL_DAY = 6
+    const val IDX_EVENT_TIMEZONE = 7
+    const val IDX_RRULE = 8
+    const val IDX_LOCATION = 9
+    const val IDX_DESCRIPTION = 10
+    const val IDX_STATUS = 11
+    const val IDX_AVAILABILITY = 12
+    const val IDX_CALENDAR_ID = 13
 }
 
 internal object AttendeeProjection {

app/src/main/java/de/jeanlucmakiola/calendula/data/ics/IcsExporter.kt

@@ -0,0 +1,45 @@
+package de.jeanlucmakiola.calendula.data.ics
+
+import android.content.Context
+import android.net.Uri
+import androidx.core.content.FileProvider
+import dagger.hilt.android.qualifiers.ApplicationContext
+import java.io.File
+import java.io.IOException
+import javax.inject.Inject
+import javax.inject.Singleton
+
+/**
+ * The Android IO edge of `.ics` export: writes a serialised calendar to a
+ * SAF document (whole-calendar backup) or stages it in a cache file behind a
+ * `FileProvider` content Uri (single-event share). The serialisation itself is
+ * the pure `domain.ics.IcsWriter`; this class only moves bytes.
+ */
+@Singleton
+class IcsExporter @Inject constructor(
+    @ApplicationContext private val context: Context,
+) {
+
+    /** Write [content] to the SAF document at [uri] as UTF-8. Throws on failure. */
+    fun writeDocument(uri: Uri, content: String) {
+        context.contentResolver.openOutputStream(uri)?.use { out ->
+            out.write(content.toByteArray(Charsets.UTF_8))
+        } ?: throw IOException("Could not open $uri for writing")
+    }
+
+    /**
+     * Stage [content] in a private cache file and return a shareable content
+     * Uri for an `ACTION_SEND`. [fileName] is the suggested `.ics` name shown to
+     * the receiving app. The authority mirrors the manifest's `FileProvider`.
+     */
+    fun stageShareFile(fileName: String, content: String): Uri {
+        val dir = File(context.cacheDir, SHARE_DIR).apply { mkdirs() }
+        val file = File(dir, fileName)
+        file.writeText(content, Charsets.UTF_8)
+        return FileProvider.getUriForFile(context, "${context.packageName}.fileprovider", file)
+    }
+
+    private companion object {
+        const val SHARE_DIR = "shared_ics"
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/data/ics/IcsImporter.kt

@@ -0,0 +1,21 @@
+package de.jeanlucmakiola.calendula.data.ics
+
+import android.content.Context
+import android.net.Uri
+import dagger.hilt.android.qualifiers.ApplicationContext
+import javax.inject.Inject
+import javax.inject.Singleton
+
+/**
+ * Android IO edge of `.ics` import: reads the text of a received/opened
+ * document [Uri]. Parsing is the pure `domain.ics.IcsParser`; this class only
+ * pulls bytes off the ContentResolver. Returns null on any read failure.
+ */
+@Singleton
+class IcsImporter @Inject constructor(
+    @ApplicationContext private val context: Context,
+) {
+    fun readText(uri: Uri): String? = runCatching {
+        context.contentResolver.openInputStream(uri)?.use { it.readBytes().toString(Charsets.UTF_8) }
+    }.getOrNull()
+}

app/src/main/java/de/jeanlucmakiola/calendula/data/prefs/SettingsPrefs.kt

@@ -4,6 +4,7 @@ import androidx.datastore.core.DataStore
 import androidx.datastore.preferences.core.Preferences
 import androidx.datastore.preferences.core.booleanPreferencesKey
 import androidx.datastore.preferences.core.edit
+import androidx.datastore.preferences.core.intPreferencesKey
 import androidx.datastore.preferences.core.stringPreferencesKey
 import de.jeanlucmakiola.calendula.domain.EventFormField
 import kotlinx.coroutines.flow.Flow
@@ -99,6 +100,22 @@ class SettingsPrefs @Inject constructor(
         store.edit { it[REMINDERS_ENABLED_KEY] = enabled }
     }
 
+    /**
+     * Whether to offer a custom event colour even on calendars that publish no
+     * colour palette (most local calendars handle it fine; synced calendars
+     * without a palette — some CalDAV — may drop or overwrite a raw colour on
+     * their next sync). Defaults to OFF: such calendars hide the colour picker
+     * until the user opts in, accepting the limitation. Local calendars and
+     * palette-backed calendars (Google, …) are unaffected by this flag.
+     */
+    val allowColorOnUnsupportedCalendars: Flow<Boolean> = store.data.map { prefs ->
+        prefs[ALLOW_COLOR_UNSUPPORTED_KEY] ?: false
+    }
+
+    suspend fun setAllowColorOnUnsupportedCalendars(enabled: Boolean) {
+        store.edit { it[ALLOW_COLOR_UNSUPPORTED_KEY] = enabled }
+    }
+
     /**
      * Whether the one-time reminder onboarding step (after the calendar
      * grant) has been shown — also true for users who tapped "not now".
@@ -111,6 +128,97 @@ class SettingsPrefs @Inject constructor(
         store.edit { it[REMINDER_ONBOARDING_KEY] = true }
     }
 
+    /**
+     * The default reminder lead time (minutes before start) prefilled on new
+     * **timed** events. `null` = no default reminder — the prior behaviour, kept
+     * as the factory default so existing users aren't surprised by reminders they
+     * never asked for. Stored as a string so "none" is distinct from a numeric
+     * value (and from an unset key, which is also "none"). Per-calendar overrides
+     * in [perCalendarReminderOverride] take precedence; all-day events instead use
+     * [defaultAllDayReminderMinutes]. Resolve with [resolveDefaultReminder].
+     */
+    val defaultReminderMinutes: Flow<Int?> = store.data.map { prefs ->
+        prefs[DEFAULT_REMINDER_KEY].toReminderMinutes()
+    }
+
+    suspend fun setDefaultReminderMinutes(minutes: Int?) {
+        store.edit { it[DEFAULT_REMINDER_KEY] = minutes?.toString() ?: NONE }
+    }
+
+    /**
+     * The default reminder lead time prefilled on new **all-day** events, in
+     * minutes before the start of the day. All-day events want day-scale lead
+     * times ("1 day before"), so they have their own default rather than reusing
+     * the timed one. `null` = no default. Per-calendar overrides do **not** apply
+     * to all-day events — they always use this global value.
+     */
+    val defaultAllDayReminderMinutes: Flow<Int?> = store.data.map { prefs ->
+        prefs[DEFAULT_ALLDAY_REMINDER_KEY].toReminderMinutes()
+    }
+
+    suspend fun setDefaultAllDayReminderMinutes(minutes: Int?) {
+        store.edit { it[DEFAULT_ALLDAY_REMINDER_KEY] = minutes?.toString() ?: NONE }
+    }
+
+    /**
+     * Wall-clock time, as minutes from local midnight, at which **all-day**
+     * reminders fire. All-day events live at UTC midnight, so a raw "1 day
+     * before" would fire at an off hour (02:00 local in CEST); this time is
+     * encoded into the provider offset so the reminder lands at, e.g., 09:00 the
+     * day before instead. Global for every all-day reminder; default 09:00.
+     * Stored/clamped to a valid 0..1439 minute-of-day.
+     */
+    val allDayReminderTimeMinutes: Flow<Int> = store.data.map { prefs ->
+        (prefs[ALLDAY_REMINDER_TIME_KEY] ?: DEFAULT_ALLDAY_REMINDER_TIME)
+            .coerceIn(0, MINUTES_PER_DAY - 1)
+    }
+
+    suspend fun setAllDayReminderTimeMinutes(minutesOfDay: Int) {
+        store.edit { it[ALLDAY_REMINDER_TIME_KEY] = minutesOfDay.coerceIn(0, MINUTES_PER_DAY - 1) }
+    }
+
+    /**
+     * Per-calendar overrides of [defaultReminderMinutes] for **timed** events,
+     * keyed by calendar id. A calendar **present** in the map overrides the global
+     * timed default for its new events: a `null` value means "no reminder", an int
+     * means that lead time. A calendar **absent** from the map inherits the global
+     * default. Serialised as `id=value;id=value`, with `none` for an explicit
+     * no-reminder override. (All-day events ignore this and use
+     * [defaultAllDayReminderMinutes].)
+     */
+    val perCalendarReminderOverride: Flow<Map<Long, Int?>> = store.data.map { prefs ->
+        parseReminderOverrides(prefs[CALENDAR_REMINDER_OVERRIDE_KEY])
+    }
+
+    suspend fun setCalendarReminderOverride(calendarId: Long, override: CalendarReminderOverride) {
+        store.edit { prefs ->
+            val current = parseReminderOverrides(prefs[CALENDAR_REMINDER_OVERRIDE_KEY]).toMutableMap()
+            current.applyOverride(calendarId, override)
+            prefs[CALENDAR_REMINDER_OVERRIDE_KEY] = serializeReminderOverrides(current)
+        }
+    }
+
+    /**
+     * Per-calendar overrides of [defaultAllDayReminderMinutes] for **all-day**
+     * events, with the same semantics as [perCalendarReminderOverride] (absent =
+     * inherit the global all-day default; present null = no reminder).
+     */
+    val perCalendarAllDayReminderOverride: Flow<Map<Long, Int?>> = store.data.map { prefs ->
+        parseReminderOverrides(prefs[CALENDAR_ALLDAY_REMINDER_OVERRIDE_KEY])
+    }
+
+    suspend fun setCalendarAllDayReminderOverride(
+        calendarId: Long,
+        override: CalendarReminderOverride,
+    ) {
+        store.edit { prefs ->
+            val current =
+                parseReminderOverrides(prefs[CALENDAR_ALLDAY_REMINDER_OVERRIDE_KEY]).toMutableMap()
+            current.applyOverride(calendarId, override)
+            prefs[CALENDAR_ALLDAY_REMINDER_OVERRIDE_KEY] = serializeReminderOverrides(current)
+        }
+    }
+
     private fun parseFormFields(stored: String?): Set<EventFormField> = when (stored) {
         null -> DEFAULT_FORM_FIELDS
         else -> stored.split(',')
@@ -125,10 +233,92 @@ class SettingsPrefs @Inject constructor(
         internal val FORM_FIELDS_KEY = stringPreferencesKey("event_form_default_fields")
         internal val REMINDERS_ENABLED_KEY = booleanPreferencesKey("reminders_enabled")
         internal val REMINDER_ONBOARDING_KEY = booleanPreferencesKey("reminder_onboarding_done")
+        internal val ALLOW_COLOR_UNSUPPORTED_KEY =
+            booleanPreferencesKey("allow_color_unsupported_calendars")
+        internal val DEFAULT_REMINDER_KEY = stringPreferencesKey("default_reminder_minutes")
+        internal val DEFAULT_ALLDAY_REMINDER_KEY =
+            stringPreferencesKey("default_allday_reminder_minutes")
+        internal val ALLDAY_REMINDER_TIME_KEY =
+            intPreferencesKey("allday_reminder_time_minutes")
+        /** 09:00 as minutes from midnight; the default all-day reminder fire time. */
+        internal const val DEFAULT_ALLDAY_REMINDER_TIME = 540
+        private const val MINUTES_PER_DAY = 1_440
+        internal val CALENDAR_REMINDER_OVERRIDE_KEY =
+            stringPreferencesKey("per_calendar_reminder_override")
+        internal val CALENDAR_ALLDAY_REMINDER_OVERRIDE_KEY =
+            stringPreferencesKey("per_calendar_allday_reminder_override")
         internal val DEFAULT_FORM_FIELDS =
             setOf(EventFormField.Location, EventFormField.Description)
     }
 }
 
+/** A calendar's reminder-default override (see [SettingsPrefs.perCalendarReminderOverride]). */
+sealed interface CalendarReminderOverride {
+    /** No override — the calendar uses the global default. */
+    data object Inherit : CalendarReminderOverride
+    /** Explicit "no reminder" for this calendar, regardless of the global default. */
+    data object None : CalendarReminderOverride
+    /** A specific lead time in minutes before the event start. */
+    data class Minutes(val minutes: Int) : CalendarReminderOverride
+}
+
+/**
+ * The lead time to prefill on a new event: the matching per-calendar override
+ * if [calendarId] has one for this event kind, otherwise the global default for
+ * that kind. All-day events consult [allDayOverrides] / [allDayGlobal]; timed
+ * events consult [timedOverrides] / [timedGlobal]. `null` = no reminder. Pure so
+ * it can be unit-tested.
+ */
+fun resolveDefaultReminder(
+    timedGlobal: Int?,
+    allDayGlobal: Int?,
+    timedOverrides: Map<Long, Int?>,
+    allDayOverrides: Map<Long, Int?>,
+    calendarId: Long?,
+    isAllDay: Boolean,
+): Int? {
+    val overrides = if (isAllDay) allDayOverrides else timedOverrides
+    val global = if (isAllDay) allDayGlobal else timedGlobal
+    return if (calendarId != null && overrides.containsKey(calendarId)) {
+        overrides[calendarId]
+    } else {
+        global
+    }
+}
+
+/** Apply a [CalendarReminderOverride] to an override map ([Inherit] removes the key). */
+private fun MutableMap<Long, Int?>.applyOverride(
+    calendarId: Long,
+    override: CalendarReminderOverride,
+) {
+    when (override) {
+        CalendarReminderOverride.Inherit -> remove(calendarId)
+        CalendarReminderOverride.None -> put(calendarId, null)
+        is CalendarReminderOverride.Minutes -> put(calendarId, override.minutes)
+    }
+}
+
+private const val NONE = "none"
+private const val ENTRY_SEP = ";"
+private const val KEY_VALUE_SEP = "="
+
+private fun String?.toReminderMinutes(): Int? = when (this) {
+    null, "", NONE -> null
+    else -> toIntOrNull()
+}
+
+private fun parseReminderOverrides(stored: String?): Map<Long, Int?> {
+    if (stored.isNullOrBlank()) return emptyMap()
+    return stored.split(ENTRY_SEP).mapNotNull { entry ->
+        val parts = entry.split(KEY_VALUE_SEP).takeIf { it.size == 2 } ?: return@mapNotNull null
+        val id = parts[0].toLongOrNull() ?: return@mapNotNull null
+        val value = if (parts[1] == NONE) null else parts[1].toIntOrNull() ?: return@mapNotNull null
+        id to value
+    }.toMap()
+}
+
+private fun serializeReminderOverrides(map: Map<Long, Int?>): String =
+    map.entries.joinToString(ENTRY_SEP) { (id, minutes) -> "$id$KEY_VALUE_SEP${minutes ?: NONE}" }
+
 private inline fun <reified E : Enum<E>> String?.toEnum(default: E): E =
     this?.let { stored -> enumValues<E>().firstOrNull { it.name == stored } } ?: default

app/src/main/java/de/jeanlucmakiola/calendula/domain/EventForm.kt

@@ -30,6 +30,17 @@ data class EventForm(
      * those are kept verbatim until the user picks something else.
      */
     val rrule: String? = null,
+    /**
+     * The event's own colour, or null to inherit the calendar's colour.
+     * [colorKey] is a `Colors.COLOR_KEY` from the calendar account's published
+     * event palette (Google, some CalDAV) — written as `EVENT_COLOR_KEY` so it
+     * round-trips through sync. When it is null but [color] is set, [color] is
+     * a raw ARGB written as `EVENT_COLOR` (local calendars, or synced ones the
+     * user opted into despite no palette). [color] mirrors the key's swatch when
+     * [colorKey] is set, so the picker can highlight it.
+     */
+    val colorKey: String? = null,
+    val color: Int? = null,
 )
 
 /**
@@ -43,6 +54,7 @@ enum class EventFormField {
     Recurrence,
     Availability,
     Visibility,
+    Color,
 }
 
 enum class EventFormProblem {
@@ -91,6 +103,11 @@ fun EventDetail.toEditForm(beginMillis: Long, endMillis: Long, zone: TimeZone):
         availability = availability,
         accessLevel = accessLevel,
         rrule = rrule?.removePrefix("RRULE:")?.takeIf { it.isNotBlank() },
+        // The provider fills EVENT_COLOR from the key, so [color] is the
+        // swatch either way; a null colour means the event inherits its
+        // calendar's colour.
+        colorKey = eventColorKey,
+        color = eventColor,
     )
 }
 
@@ -130,6 +147,7 @@ fun EventForm.populatedFields(): Set<EventFormField> = buildSet {
     if (rrule != null) add(EventFormField.Recurrence)
     if (availability != Availability.Busy) add(EventFormField.Availability)
     if (accessLevel != AccessLevel.Default) add(EventFormField.Visibility)
+    if (colorKey != null || color != null) add(EventFormField.Color)
 }
 
 fun EventForm.problems(): Set<EventFormProblem> = buildSet {

app/src/main/java/de/jeanlucmakiola/calendula/domain/Models.kt

@@ -15,6 +15,17 @@ data class CalendarSource(
      * subscriptions, birthday calendars and other read-only sources.
      */
     val canModifyContents: Boolean = false,
+    /**
+     * A device-only calendar the app itself owns (`ACCOUNT_TYPE_LOCAL`): it has
+     * no sync backend, so the app can rename / recolor / delete it. Synced
+     * calendars (Google, DAVx5, …) are managed in their own source app instead.
+     */
+    val isLocal: Boolean = false,
+    /**
+     * Free-text note for a local calendar (stored in `CAL_SYNC1`, which the app
+     * owns for its own calendars). Always null for synced calendars.
+     */
+    val description: String? = null,
 )
 
 data class EventInstance(
@@ -47,8 +58,25 @@ data class EventDetail(
     val eventTimezone: String? = null,
     /** This device user's own response (`Events.SELF_ATTENDEE_STATUS`). */
     val selfStatus: AttendeeStatus = AttendeeStatus.Unknown,
+    /**
+     * The event's own raw colour (`Events.EVENT_COLOR`), null when the event
+     * inherits its calendar's colour. Unlike [EventInstance.color] (which
+     * already folds in the calendar fallback for display) this stays null so
+     * the edit form can tell "has own colour" from "inherits".
+     */
+    val eventColor: Int? = null,
+    /** The event's `Events.EVENT_COLOR_KEY` (a calendar-palette key), or null. */
+    val eventColorKey: String? = null,
 )
 
+/**
+ * One selectable event colour published by a calendar's account
+ * (`CalendarContract.Colors`, `TYPE_EVENT`): [key] is the account-scoped
+ * `COLOR_KEY` written as `EVENT_COLOR_KEY` (so the colour survives sync),
+ * [argb] is the swatch it renders as.
+ */
+data class EventColorOption(val key: String, val argb: Int)
+
 data class Attendee(
     val name: String,
     val email: String?,

app/src/main/java/de/jeanlucmakiola/calendula/domain/ics/EventDetailIcs.kt

@@ -0,0 +1,29 @@
+package de.jeanlucmakiola.calendula.domain.ics
+
+import de.jeanlucmakiola.calendula.domain.EventDetail
+
+/**
+ * Build the [IcsEvent] for sharing a single event. We export the event the user
+ * is looking at as a **one-off** VEVENT (no RRULE): the detail screen shows one
+ * occurrence, so "share this event" should hand off exactly that instance, not
+ * a whole series anchored to a possibly-different DTSTART. Reminders are the
+ * already-decoded semantic lead times the detail screen holds.
+ */
+fun EventDetail.toShareIcsEvent(): IcsEvent {
+    val startMillis = instance.start.toEpochMilliseconds()
+    return IcsEvent(
+        uid = deriveIcsUid(existingUid = null, eventId = instance.eventId, dtStartMillis = startMillis),
+        summary = instance.title,
+        start = instance.start,
+        end = instance.end,
+        isAllDay = instance.isAllDay,
+        zoneId = eventTimezone?.takeIf { it.isNotBlank() } ?: "UTC",
+        recurrenceRule = null,
+        location = instance.location,
+        description = description,
+        reminderMinutes = reminders.map { it.minutes },
+        status = status,
+        availability = availability,
+        calendarName = null,
+    )
+}

app/src/main/java/de/jeanlucmakiola/calendula/domain/ics/IcsDuration.kt

@@ -0,0 +1,40 @@
+package de.jeanlucmakiola.calendula.domain.ics
+
+// Android's calendar provider (and Calendula's own writes) use the non-standard
+// single-unit forms P<n>S / P<n>D / P<n>W — seconds without the RFC-required
+// leading T. Matched first; anything else falls through to the general grammar.
+private val DURATION_SINGLE_UNIT = Regex("""([+-]?)P(\d+)([WDS])""")
+private val DURATION_GENERAL =
+    Regex("""([+-]?)P(?:(\d+)W)?(?:(\d+)D)?(?:T(?:(\d+)H)?(?:(\d+)M)?(?:(\d+)S)?)?""")
+
+/**
+ * Milliseconds of a DURATION (`P1D`, `P3600S`, `PT1H30M`, `-PT15M`, `P1W`, …),
+ * sign-aware. Calendula writes `P<days>D` / `P<seconds>S`, but the parser also
+ * accepts the general RFC 5545 grammar so backup `DURATION` rows and foreign
+ * `VALARM` triggers round-trip. Unparseable input is treated as zero.
+ */
+fun parseRfc2445DurationMillis(duration: String?): Long {
+    if (duration.isNullOrBlank()) return 0L
+    val s = duration.trim()
+
+    DURATION_SINGLE_UNIT.matchEntire(s)?.let { m ->
+        val unitSeconds = when (m.groupValues[3]) {
+            "W" -> 7L * 24 * 60 * 60
+            "D" -> 24L * 60 * 60
+            else -> 1L // S
+        }
+        return m.signum() * m.groupValues[2].toLong() * unitSeconds * 1_000L
+    }
+
+    val m = DURATION_GENERAL.matchEntire(s) ?: return 0L
+    val weeks = m.groupValues[2].toLongOrNull() ?: 0L
+    val days = m.groupValues[3].toLongOrNull() ?: 0L
+    val hours = m.groupValues[4].toLongOrNull() ?: 0L
+    val minutes = m.groupValues[5].toLongOrNull() ?: 0L
+    val seconds = m.groupValues[6].toLongOrNull() ?: 0L
+    val totalSeconds = ((((weeks * 7 + days) * 24 + hours) * 60 + minutes) * 60 + seconds)
+    return m.signum() * totalSeconds * 1_000L
+}
+
+/** Sign carried by group 1 (`-` → -1, otherwise +1) of a duration match. */
+private fun MatchResult.signum(): Long = if (groupValues[1] == "-") -1L else 1L

app/src/main/java/de/jeanlucmakiola/calendula/domain/ics/IcsEvent.kt

@@ -0,0 +1,43 @@
+package de.jeanlucmakiola.calendula.domain.ics
+
+import de.jeanlucmakiola.calendula.domain.Availability
+import de.jeanlucmakiola.calendula.domain.EventStatus
+import kotlin.time.Instant
+
+/**
+ * A single event ready to be serialised to a `VEVENT`, decoupled from the
+ * provider so [IcsWriter] stays pure-Kotlin and JVM-testable. [start]/[end] are
+ * absolute instants; [isAllDay] and [recurrenceRule] decide how they are
+ * rendered (see [IcsWriter]'s timezone rule).
+ */
+data class IcsEvent(
+    /** RFC 5545 UID — globally stable across exports (see [deriveIcsUid]). */
+    val uid: String,
+    val summary: String,
+    val start: Instant,
+    /** Exclusive end (for all-day: the next-day midnight, as the provider stores it). */
+    val end: Instant,
+    val isAllDay: Boolean,
+    /** IANA zone id (`Events.EVENT_TIMEZONE`); only used for recurring timed events. */
+    val zoneId: String,
+    /** Bare RRULE value (no `RRULE:` prefix), or null for a one-off event. */
+    val recurrenceRule: String? = null,
+    val location: String? = null,
+    val description: String? = null,
+    /** Reminder lead times in minutes before start (raw provider offsets). */
+    val reminderMinutes: List<Int> = emptyList(),
+    val status: EventStatus = EventStatus.Confirmed,
+    val availability: Availability = Availability.Busy,
+    /** Source calendar name, emitted as `X-CALENDULA-CALENDAR` so a combined backup can fan back out. */
+    val calendarName: String? = null,
+)
+
+/**
+ * The UID to export for a provider event. A row that already carries a UID
+ * (`Events.UID_2445`) keeps it; otherwise we synthesise a **stable** one from
+ * the event id and its DTSTART so the same legacy event yields the same UID
+ * across repeated backups — which keeps a later restore from duplicating it.
+ */
+fun deriveIcsUid(existingUid: String?, eventId: Long, dtStartMillis: Long): String =
+    existingUid?.trim()?.takeIf { it.isNotEmpty() }
+        ?: "$eventId-$dtStartMillis@calendula"

app/src/main/java/de/jeanlucmakiola/calendula/domain/ics/IcsParser.kt

@@ -0,0 +1,259 @@
+package de.jeanlucmakiola.calendula.domain.ics
+
+import de.jeanlucmakiola.calendula.domain.Availability
+import de.jeanlucmakiola.calendula.domain.EventStatus
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.LocalDateTime
+import kotlinx.datetime.LocalTime
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.atStartOfDayIn
+import kotlinx.datetime.toInstant
+import kotlin.time.Instant
+
+/**
+ * A `VEVENT` parsed from an `.ics` file — the read-side mirror of [IcsEvent],
+ * but [uid] is nullable (an incoming event may carry none; the insert layer
+ * then assigns one). Times are absolute instants; [isAllDay]/[zoneId] mirror
+ * how the writer encoded them.
+ */
+data class ParsedIcsEvent(
+    val uid: String?,
+    val summary: String,
+    val start: Instant,
+    val end: Instant,
+    val isAllDay: Boolean,
+    val zoneId: String,
+    val recurrenceRule: String? = null,
+    val location: String? = null,
+    val description: String? = null,
+    val reminderMinutes: List<Int> = emptyList(),
+    val status: EventStatus = EventStatus.Confirmed,
+    val availability: Availability = Availability.Busy,
+    val calendarName: String? = null,
+)
+
+/** Things the parser dropped rather than failing — surfaced in the import report. */
+enum class IcsParseWarning {
+    /** A `RECURRENCE-ID` override occurrence (not modelled; only masters import). */
+    ModifiedOccurrenceSkipped,
+
+    /** A `VEVENT` with no parseable `DTSTART`. */
+    EventWithoutStartSkipped,
+
+    /** `ATTENDEE` rows were present; Calendula doesn't import attendees. */
+    AttendeesIgnored,
+
+    /** A `TZID` couldn't be resolved against the device tz database (used local zone). */
+    UnknownTimezone,
+}
+
+data class IcsParseResult(
+    val events: List<ParsedIcsEvent>,
+    val warnings: Set<IcsParseWarning>,
+)
+
+/** Outcome of a bulk `.ics` import into one calendar. */
+data class IcsImportSummary(val imported: Int, val skippedDuplicate: Int)
+
+/**
+ * Hand-rolled RFC 5545 reader, the inverse of [IcsWriter]. Pure and
+ * JVM-testable. Liberal-in/strict-out: unknown properties are ignored, a single
+ * malformed `VEVENT` is skipped (not fatal), and unsupported constructs
+ * (`RECURRENCE-ID`, attendees, unresolved `TZID`) are reported as [warnings]
+ * rather than silently dropped. `VTIMEZONE` blocks are skipped — a `TZID` is
+ * resolved against the OS tz database instead ([deviceZone] is the fallback).
+ */
+class IcsParser(private val deviceZone: TimeZone = TimeZone.currentSystemDefault()) {
+
+    fun parse(text: String): IcsParseResult {
+        val lines = unfoldLines(text)
+        val events = mutableListOf<ParsedIcsEvent>()
+        val warnings = mutableSetOf<IcsParseWarning>()
+        var calendarName: String? = null
+
+        var i = 0
+        while (i < lines.size) {
+            val line = parseContentLine(lines[i])
+            if (line == null) { i++; continue }
+            when {
+                line.isBegin("VEVENT") -> {
+                    val end = indexOfEnd(lines, i + 1, "VEVENT")
+                    parseVevent(lines.subList(i + 1, end), calendarName, warnings)
+                        ?.let(events::add)
+                    i = end + 1
+                }
+                line.isBegin("VTIMEZONE") -> {
+                    // Skipped wholesale; TZIDs resolve against the OS tz database.
+                    i = indexOfEnd(lines, i + 1, "VTIMEZONE") + 1
+                }
+                line.name == "X-WR-CALNAME" -> {
+                    calendarName = unescapeText(line.value).trim().ifEmpty { null }
+                    i++
+                }
+                else -> i++
+            }
+        }
+        return IcsParseResult(events, warnings)
+    }
+
+    private fun parseVevent(
+        body: List<String>,
+        fileCalendarName: String?,
+        warnings: MutableSet<IcsParseWarning>,
+    ): ParsedIcsEvent? {
+        var uid: String? = null
+        var summary = ""
+        var dtStart: IcsDateTime? = null
+        var dtEnd: IcsDateTime? = null
+        var duration: String? = null
+        var rrule: String? = null
+        var location: String? = null
+        var description: String? = null
+        var status = EventStatus.Confirmed
+        var availability = Availability.Busy
+        var calendarName = fileCalendarName
+        val reminders = mutableListOf<Int>()
+        var skipAsOverride = false
+
+        var i = 0
+        while (i < body.size) {
+            val line = parseContentLine(body[i])
+            if (line == null) { i++; continue }
+            when (line.name) {
+                "BEGIN" -> if (line.value.trim().equals("VALARM", true)) {
+                    val end = indexOfEnd(body, i + 1, "VALARM")
+                    parseAlarmMinutes(body.subList(i + 1, end))?.let(reminders::add)
+                    i = end + 1
+                    continue
+                }
+                "UID" -> uid = line.value.trim().ifEmpty { null }
+                "SUMMARY" -> summary = unescapeText(line.value)
+                "DTSTART" -> dtStart = parseIcsDateTime(line, warnings)
+                "DTEND" -> dtEnd = parseIcsDateTime(line, warnings)
+                "DURATION" -> duration = line.value.trim()
+                "RRULE" -> rrule = line.value.trim().ifEmpty { null }
+                "LOCATION" -> location = unescapeText(line.value).ifEmpty { null }
+                "DESCRIPTION" -> description = unescapeText(line.value).ifEmpty { null }
+                "STATUS" -> status = mapIcsStatus(line.value)
+                "TRANSP" -> availability =
+                    if (line.value.trim().equals("TRANSPARENT", true)) Availability.Free
+                    else Availability.Busy
+                "RECURRENCE-ID" -> skipAsOverride = true
+                "ATTENDEE" -> warnings.add(IcsParseWarning.AttendeesIgnored)
+                "X-CALENDULA-CALENDAR" ->
+                    calendarName = unescapeText(line.value).trim().ifEmpty { calendarName }
+            }
+            i++
+        }
+
+        if (skipAsOverride) {
+            warnings.add(IcsParseWarning.ModifiedOccurrenceSkipped)
+            return null
+        }
+        val start = dtStart ?: run {
+            warnings.add(IcsParseWarning.EventWithoutStartSkipped)
+            return null
+        }
+        val end = dtEnd
+            ?: duration?.let {
+                start.copy(
+                    instant = Instant.fromEpochMilliseconds(
+                        start.instant.toEpochMilliseconds() + parseRfc2445DurationMillis(it),
+                    ),
+                )
+            }
+            ?: start
+        return ParsedIcsEvent(
+            uid = uid,
+            summary = summary,
+            start = start.instant,
+            end = end.instant,
+            isAllDay = start.isAllDay,
+            zoneId = start.zoneId,
+            recurrenceRule = rrule,
+            location = location,
+            description = description,
+            reminderMinutes = reminders.distinct(),
+            status = status,
+            availability = availability,
+            calendarName = calendarName,
+        )
+    }
+
+    /** A VALARM's lead time in minutes before start, or null if not a usable relative trigger. */
+    private fun parseAlarmMinutes(body: List<String>): Int? {
+        val trigger = body.asSequence()
+            .mapNotNull { parseContentLine(it) }
+            .firstOrNull { it.name == "TRIGGER" }
+            ?: return null
+        // Absolute (DATE-TIME) triggers can't be expressed as a lead time.
+        if (trigger.params["VALUE"].equals("DATE-TIME", true)) return null
+        val millis = parseRfc2445DurationMillis(trigger.value)
+        // Negative = before start (the normal case) → positive lead minutes.
+        return (-millis / 60_000L).toInt().coerceAtLeast(0)
+    }
+
+    private fun parseIcsDateTime(line: IcsContentLine, warnings: MutableSet<IcsParseWarning>): IcsDateTime? {
+        val raw = line.value.trim()
+        val isDate = line.params["VALUE"].equals("DATE", true) ||
+            (raw.length == 8 && !raw.contains('T'))
+        if (isDate) {
+            val date = parseBasicDate(raw) ?: return null
+            return IcsDateTime(date.atStartOfDayIn(TimeZone.UTC), isAllDay = true, zoneId = "UTC")
+        }
+        val isUtc = raw.endsWith("Z")
+        val ldt = parseBasicDateTime(raw.removeSuffix("Z")) ?: return null
+        if (isUtc) return IcsDateTime(ldt.toInstant(TimeZone.UTC), isAllDay = false, zoneId = "UTC")
+
+        val tzid = line.params["TZID"]
+        val resolved = tzid?.let { id -> runCatching { TimeZone.of(id) }.getOrNull()?.let { id to it } }
+        if (tzid != null && resolved == null) warnings.add(IcsParseWarning.UnknownTimezone)
+        val (zoneId, zone) = resolved ?: (deviceZone.id to deviceZone)
+        return IcsDateTime(ldt.toInstant(zone), isAllDay = false, zoneId = zoneId)
+    }
+
+    private data class IcsDateTime(val instant: Instant, val isAllDay: Boolean, val zoneId: String)
+
+    private companion object {
+        fun IcsContentLine.isBegin(component: String) =
+            name == "BEGIN" && value.trim().equals(component, true)
+
+        /** Index of the matching `END:<component>` at/after [from], or list end. */
+        fun indexOfEnd(lines: List<String>, from: Int, component: String): Int {
+            var i = from
+            while (i < lines.size) {
+                val line = parseContentLine(lines[i])
+                if (line != null && line.name == "END" &&
+                    line.value.trim().equals(component, true)
+                ) {
+                    return i
+                }
+                i++
+            }
+            return lines.size
+        }
+
+        fun mapIcsStatus(value: String): EventStatus = when (value.trim().uppercase()) {
+            "TENTATIVE" -> EventStatus.Tentative
+            "CANCELLED" -> EventStatus.Cancelled
+            else -> EventStatus.Confirmed
+        }
+
+        fun parseBasicDate(s: String): LocalDate? = runCatching {
+            LocalDate(s.substring(0, 4).toInt(), s.substring(4, 6).toInt(), s.substring(6, 8).toInt())
+        }.getOrNull()
+
+        fun parseBasicDateTime(s: String): LocalDateTime? = runCatching {
+            val date = LocalDate(
+                s.substring(0, 4).toInt(), s.substring(4, 6).toInt(), s.substring(6, 8).toInt(),
+            )
+            // Format is YYYYMMDD 'T' HHMMSS; seconds optional.
+            val time = LocalTime(
+                s.substring(9, 11).toInt(),
+                s.substring(11, 13).toInt(),
+                if (s.length >= 15) s.substring(13, 15).toInt() else 0,
+            )
+            LocalDateTime(date, time)
+        }.getOrNull()
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/domain/ics/IcsText.kt

@@ -0,0 +1,155 @@
+package de.jeanlucmakiola.calendula.domain.ics
+
+/**
+ * Low-level RFC 5545 text mechanics, kept separate from [IcsWriter] so the
+ * escaping and folding rules can be tested in isolation. Pure Kotlin — no
+ * Android, no time handling.
+ */
+
+/** iCalendar mandates CRLF line breaks, not the platform separator. */
+const val ICS_CRLF: String = "\r\n"
+
+/** RFC 5545 §3.1: content lines SHOULD be folded at 75 octets (excluding the break). */
+private const val MAX_OCTETS = 75
+
+/**
+ * Escape a TEXT value (SUMMARY, DESCRIPTION, LOCATION, …) per RFC 5545 §3.3.11:
+ * backslash, semicolon and comma are escaped, newlines become the literal `\n`.
+ * Backslash is handled first so it doesn't double-escape the others' markers.
+ */
+fun escapeText(value: String): String = buildString(value.length) {
+    for (ch in value) {
+        when (ch) {
+            '\\' -> append("\\\\")
+            ';' -> append("\\;")
+            ',' -> append("\\,")
+            '\n' -> append("\\n")
+            '\r' -> Unit // CR is dropped; a lone CRLF in source text folds to one \n
+            else -> append(ch)
+        }
+    }
+}
+
+/**
+ * Fold a single content line to ≤75 octets per physical line, inserting
+ * `CRLF + space` between segments (the space is part of the 75-octet budget of
+ * the continuation line, so its content caps at 74). Folding counts UTF-8
+ * octets, never splitting a multi-byte character across a boundary.
+ */
+fun foldLine(line: String): String {
+    if (line.toByteArray(Charsets.UTF_8).size <= MAX_OCTETS) return line
+    val out = StringBuilder()
+    var octetsThisLine = 0
+    var first = true
+    var i = 0
+    while (i < line.length) {
+        val cp = line.codePointAt(i)
+        val width = Character.charCount(cp)
+        val piece = line.substring(i, i + width)
+        val pieceOctets = piece.toByteArray(Charsets.UTF_8).size
+        // Continuation lines spend one octet on the leading space.
+        val budget = if (first) MAX_OCTETS else MAX_OCTETS - 1
+        if (octetsThisLine + pieceOctets > budget) {
+            out.append(ICS_CRLF).append(' ')
+            octetsThisLine = 0
+            first = false
+        }
+        out.append(piece)
+        octetsThisLine += pieceOctets
+        i += width
+    }
+    return out.toString()
+}
+
+/**
+ * Reverse of [escapeText]: turn `\n`/`\N` into newlines and unescape `\\`, `\;`,
+ * `\,`. A backslash before any other character is dropped, keeping the
+ * character (lenient — foreign files escape liberally).
+ */
+fun unescapeText(value: String): String = buildString(value.length) {
+    var i = 0
+    while (i < value.length) {
+        val c = value[i]
+        if (c == '\\' && i + 1 < value.length) {
+            when (val next = value[i + 1]) {
+                'n', 'N' -> append('\n')
+                else -> append(next) // \\, \;, \, and any other escaped char
+            }
+            i += 2
+        } else {
+            append(c)
+            i++
+        }
+    }
+}
+
+/**
+ * Reverse of [foldLine] across a whole document: split into physical lines on
+ * CRLF/LF/CR, then re-join any line that begins with a single space or tab onto
+ * the previous one (RFC 5545 unfolding). Returns the logical content lines.
+ */
+fun unfoldLines(text: String): List<String> {
+    val out = mutableListOf<String>()
+    for (physical in text.split("\r\n", "\n", "\r")) {
+        if (physical.isEmpty()) continue
+        val isContinuation = physical[0] == ' ' || physical[0] == '\t'
+        if (isContinuation && out.isNotEmpty()) {
+            out[out.lastIndex] = out.last() + physical.substring(1)
+        } else {
+            out.add(physical)
+        }
+    }
+    return out
+}
+
+/**
+ * One unfolded content line split into its property name, parameters and value:
+ * `SUMMARY;LANGUAGE=en:Lunch` → name `SUMMARY`, params `{LANGUAGE=en}`, value
+ * `Lunch`. The value is everything after the first colon that isn't inside a
+ * quoted parameter; param keys are upper-cased, quoted param values unquoted.
+ * Returns null for a line with no colon.
+ */
+data class IcsContentLine(val name: String, val params: Map<String, String>, val value: String)
+
+fun parseContentLine(line: String): IcsContentLine? {
+    var inQuote = false
+    var colon = -1
+    for (i in line.indices) {
+        when (line[i]) {
+            '"' -> inQuote = !inQuote
+            ':' -> if (!inQuote) { colon = i; break }
+        }
+    }
+    if (colon < 0) return null
+    val head = splitUnquoted(line.substring(0, colon), ';')
+    val name = head.firstOrNull()?.trim()?.uppercase().orEmpty()
+    if (name.isEmpty()) return null
+    val params = buildMap {
+        for (part in head.drop(1)) {
+            val eq = part.indexOf('=')
+            if (eq > 0) {
+                put(
+                    part.substring(0, eq).trim().uppercase(),
+                    part.substring(eq + 1).trim().removeSurrounding("\""),
+                )
+            }
+        }
+    }
+    return IcsContentLine(name, params, line.substring(colon + 1))
+}
+
+/** Split on [delimiter] except where it falls inside a double-quoted run. */
+private fun splitUnquoted(text: String, delimiter: Char): List<String> {
+    val parts = mutableListOf<String>()
+    val current = StringBuilder()
+    var inQuote = false
+    for (c in text) {
+        when {
+            c == '"' -> { inQuote = !inQuote; current.append(c) }
+            c == delimiter && !inQuote -> { parts.add(current.toString()); current.clear() }
+            else -> current.append(c)
+        }
+    }
+    parts.add(current.toString())
+    return parts
+}

app/src/main/java/de/jeanlucmakiola/calendula/domain/ics/IcsWriter.kt

@@ -0,0 +1,124 @@
+package de.jeanlucmakiola.calendula.domain.ics
+
+import de.jeanlucmakiola.calendula.domain.Availability
+import de.jeanlucmakiola.calendula.domain.EventStatus
+import kotlinx.datetime.LocalDateTime
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.number
+import kotlinx.datetime.toLocalDateTime
+import kotlin.time.Instant
+
+/** Default `PRODID` advertising the writer that produced the file. */
+const val ICS_PROD_ID: String = "-//Jean-Luc Makiola//Calendula//EN"
+
+/**
+ * Hand-rolled RFC 5545 serialiser for the subset Calendula models. No iCal
+ * library: we stay on `kotlinx-datetime` and own the output, exactly as
+ * `domain/Recurrence.kt` owns RRULE. Pure and JVM-testable — the caller
+ * supplies [dtStamp] (the export moment) so the writer never reads a clock.
+ *
+ * Timezone rule (see plan 05, decision 1):
+ *  - all-day      → `VALUE=DATE`, no zone;
+ *  - timed one-off → UTC instant with a `Z` suffix (an instant is an instant);
+ *  - timed recurring → `TZID`-labelled local wall time, so the series stays
+ *    anchored to wall-clock across DST. No `VTIMEZONE` block is emitted; import
+ *    resolves the `TZID` against the OS tz database.
+ */
+class IcsWriter(private val prodId: String = ICS_PROD_ID) {
+
+    fun writeCalendar(events: List<IcsEvent>, dtStamp: Instant): String {
+        val lines = buildList {
+            add("BEGIN:VCALENDAR")
+            add("VERSION:2.0")
+            add("PRODID:$prodId")
+            add("CALSCALE:GREGORIAN")
+            events.forEach { appendEvent(it, dtStamp) }
+            add("END:VCALENDAR")
+        }
+        return lines.joinToString(ICS_CRLF, postfix = ICS_CRLF) { foldLine(it) }
+    }
+
+    private fun MutableList<String>.appendEvent(event: IcsEvent, dtStamp: Instant) {
+        add("BEGIN:VEVENT")
+        add("UID:${event.uid}")
+        add("DTSTAMP:${utcStamp(dtStamp)}")
+        add("SUMMARY:${escapeText(event.summary)}")
+        appendTimes(event)
+        event.recurrenceRule?.takeIf { it.isNotBlank() }
+            ?.let { add("RRULE:${it.removePrefix("RRULE:")}") }
+        event.location?.takeIf { it.isNotBlank() }
+            ?.let { add("LOCATION:${escapeText(it)}") }
+        event.description?.takeIf { it.isNotBlank() }
+            ?.let { add("DESCRIPTION:${escapeText(it)}") }
+        add("STATUS:${statusValue(event.status)}")
+        add("TRANSP:${transpValue(event.availability)}")
+        event.calendarName?.takeIf { it.isNotBlank() }
+            ?.let { add("X-CALENDULA-CALENDAR:${escapeText(it)}") }
+        event.reminderMinutes.filter { it >= 0 }.distinct().forEach { minutes ->
+            appendAlarm(minutes, event.summary)
+        }
+        add("END:VEVENT")
+    }
+
+    private fun MutableList<String>.appendTimes(event: IcsEvent) = when {
+        event.isAllDay -> {
+            add("DTSTART;VALUE=DATE:${utcDate(event.start)}")
+            add("DTEND;VALUE=DATE:${utcDate(event.end)}")
+        }
+        // Recurring: anchor to wall-clock in the event's own zone.
+        event.recurrenceRule?.isNotBlank() == true -> {
+            val zone = runCatching { TimeZone.of(event.zoneId) }.getOrNull()
+            if (zone != null) {
+                add("DTSTART;TZID=${event.zoneId}:${localStamp(event.start, zone)}")
+                add("DTEND;TZID=${event.zoneId}:${localStamp(event.end, zone)}")
+            } else {
+                // Unknown zone id → fall back to plain UTC instants.
+                add("DTSTART:${utcStamp(event.start)}")
+                add("DTEND:${utcStamp(event.end)}")
+            }
+        }
+        else -> {
+            add("DTSTART:${utcStamp(event.start)}")
+            add("DTEND:${utcStamp(event.end)}")
+        }
+    }
+
+    private fun MutableList<String>.appendAlarm(minutes: Int, summary: String) {
+        add("BEGIN:VALARM")
+        add("ACTION:DISPLAY")
+        add("DESCRIPTION:${escapeText(summary.ifBlank { "Reminder" })}")
+        add("TRIGGER:${triggerValue(minutes)}")
+        add("END:VALARM")
+    }
+
+    private companion object {
+        fun statusValue(status: EventStatus): String = when (status) {
+            EventStatus.Confirmed -> "CONFIRMED"
+            EventStatus.Tentative -> "TENTATIVE"
+            EventStatus.Cancelled -> "CANCELLED"
+        }
+
+        // iCal TRANSP is binary; only an explicitly free event is TRANSPARENT.
+        fun transpValue(availability: Availability): String =
+            if (availability == Availability.Free) "TRANSPARENT" else "OPAQUE"
+
+        // A lead time of 0 fires at start (PT0M); anything positive is "before".
+        fun triggerValue(minutes: Int): String =
+            if (minutes <= 0) "PT0M" else "-PT${minutes}M"
+
+        fun utcStamp(instant: Instant): String =
+            basic(instant.toLocalDateTime(TimeZone.UTC)) + "Z"
+
+        fun localStamp(instant: Instant, zone: TimeZone): String =
+            basic(instant.toLocalDateTime(zone))
+
+        fun utcDate(instant: Instant): String {
+            val dt = instant.toLocalDateTime(TimeZone.UTC)
+            return "%04d%02d%02d".format(dt.year, dt.month.number, dt.day)
+        }
+
+        fun basic(dt: LocalDateTime): String = "%04d%02d%02dT%02d%02d%02d".format(
+            dt.year, dt.month.number, dt.day, dt.hour, dt.minute, dt.second,
+        )
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/domain/ics/ParsedIcsForm.kt

@@ -0,0 +1,38 @@
+package de.jeanlucmakiola.calendula.domain.ics
+
+import de.jeanlucmakiola.calendula.domain.EventForm
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.LocalDateTime
+import kotlinx.datetime.LocalTime
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.toLocalDateTime
+
+/**
+ * Prefill the create form from a single parsed `.ics` event (the "open one
+ * event" path). [calendarId] is left null so the form preselects the last-used
+ * calendar, exactly like a fresh create — the user confirms the target and
+ * reviews everything before saving. Mirrors `EventDetail.toEditForm`'s all-day
+ * handling (provider all-day times are UTC midnights with an exclusive end).
+ */
+fun ParsedIcsEvent.toEventForm(zone: TimeZone): EventForm {
+    val (start, end) = if (isAllDay) {
+        val startDate = this.start.toLocalDateTime(TimeZone.UTC).date
+        val endExclusive = this.end.toLocalDateTime(TimeZone.UTC).date
+        val endDate = maxOf(startDate, LocalDate.fromEpochDays(endExclusive.toEpochDays() - 1))
+        LocalDateTime(startDate, LocalTime(9, 0)) to LocalDateTime(endDate, LocalTime(10, 0))
+    } else {
+        this.start.toLocalDateTime(zone) to this.end.toLocalDateTime(zone)
+    }
+    return EventForm(
+        calendarId = null,
+        title = summary,
+        isAllDay = isAllDay,
+        start = start,
+        end = end,
+        location = location.orEmpty(),
+        description = description.orEmpty(),
+        reminders = reminderMinutes.distinct().sorted(),
+        availability = availability,
+        rrule = recurrenceRule?.removePrefix("RRULE:")?.takeIf { it.isNotBlank() },
+    )
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/CalendarHost.kt

@@ -15,16 +15,23 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
+import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.ui.agenda.AgendaScreen
+import de.jeanlucmakiola.calendula.ui.calendars.CalendarsScreen
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
 import de.jeanlucmakiola.calendula.ui.common.rememberCalendarSlideSpec
 import de.jeanlucmakiola.calendula.ui.day.DayScreen
 import de.jeanlucmakiola.calendula.ui.detail.EventDetailScreen
 import de.jeanlucmakiola.calendula.ui.edit.EventEditScreen
+import de.jeanlucmakiola.calendula.ui.imports.ImportScreen
 import de.jeanlucmakiola.calendula.ui.month.MonthScreen
 import de.jeanlucmakiola.calendula.ui.settings.SettingsScreen
 import de.jeanlucmakiola.calendula.ui.week.WeekScreen
 import kotlinx.datetime.LocalDate
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.toLocalDateTime
+import kotlin.time.Clock
 
 /**
  * Holds the active top-level view (spec M1) and swaps between the calendar
@@ -41,6 +48,10 @@ fun CalendarHost(
     modifier: Modifier = Modifier,
     requestedDetailKey: LongArray? = null,
     onDetailKeyConsumed: () -> Unit = {},
+    widgetNavRequest: WidgetNavRequest? = null,
+    onWidgetNavConsumed: () -> Unit = {},
+    requestedImportUri: android.net.Uri? = null,
+    onImportConsumed: () -> Unit = {},
 ) {
     var view by rememberSaveable { mutableStateOf(CalendarView.Week) }
     val onSelectView: (CalendarView) -> Unit = { view = it }
@@ -86,13 +97,23 @@ fun CalendarHost(
     var showSettings by rememberSaveable { mutableStateOf(false) }
     val onOpenSettings = { showSettings = true }
 
+    // Calendar manager (reached from Settings) — its own overlay so it slides
+    // over Settings and survives view switches.
+    var showCalendars by rememberSaveable { mutableStateOf(false) }
+
     // Event form (v1.2 create) — same held-key pattern as the detail screen:
     // [heldCreateIso] keeps the prefill date alive through the slide-out.
+    // [createStartMinutes] is the tapped slot's start (minutes from midnight)
+    // when the form is opened from a day/week grid tap; null from the FAB.
     var createDateIso by rememberSaveable { mutableStateOf<String?>(null) }
     var heldCreateIso by remember { mutableStateOf<String?>(null) }
-    val onCreateEvent: (LocalDate) -> Unit = { date ->
+    var createStartMinutes by rememberSaveable { mutableStateOf<Int?>(null) }
+    var heldCreateMinutes by remember { mutableStateOf<Int?>(null) }
+    val onCreateEvent: (LocalDate, Int?) -> Unit = { date, startMinutes ->
         heldCreateIso = date.toString()
         createDateIso = date.toString()
+        heldCreateMinutes = startMinutes
+        createStartMinutes = startMinutes
     }
 
     // Edit form (v1.3) — reuses the detail screen's occurrence key; for
@@ -104,6 +125,40 @@ fun CalendarHost(
     var editKey by rememberSaveable { mutableStateOf<LongArray?>(null) }
     var heldEditKey by remember { mutableStateOf<LongArray?>(null) }
 
+    // An opened/received .ics file. [ImportScreen] parses it and either opens
+    // the prefilled create form (one event → [importForm]) or its own bulk
+    // picker (many). A plain conditional overlay (no slide) — it's transient.
+    var importUri by remember { mutableStateOf<android.net.Uri?>(null) }
+    var importForm by remember { mutableStateOf<EventForm?>(null) }
+    LaunchedEffect(requestedImportUri) {
+        if (requestedImportUri != null) {
+            importUri = requestedImportUri
+            onImportConsumed()
+        }
+    }
+
+    // A home-screen widget launch asks to open a date (→ day view) or start a
+    // create. Handled once and cleared, mirroring [requestedDetailKey].
+    LaunchedEffect(widgetNavRequest) {
+        when (val req = widgetNavRequest) {
+            is WidgetNavRequest.OpenDate -> {
+                pendingDayIso = req.dateIso
+                view = CalendarView.Day
+                onWidgetNavConsumed()
+            }
+            is WidgetNavRequest.Create -> {
+                val iso = req.dateIso ?: Clock.System.now()
+                    .toLocalDateTime(TimeZone.currentSystemDefault()).date.toString()
+                heldCreateIso = iso
+                createDateIso = iso
+                heldCreateMinutes = null
+                createStartMinutes = null
+                onWidgetNavConsumed()
+            }
+            null -> {}
+        }
+    }
+
     val slideSpec = rememberCalendarSlideSpec()
 
     Box(modifier = modifier.fillMaxSize()) {
@@ -130,6 +185,13 @@ fun CalendarHost(
                 onOpenSettings = onOpenSettings,
                 onCreateEvent = onCreateEvent,
             )
+            CalendarView.Agenda -> AgendaScreen(
+                selectedView = view,
+                onSelectView = onSelectView,
+                onEventClick = onEventClick,
+                onOpenSettings = onOpenSettings,
+                onCreateEvent = onCreateEvent,
+            )
         }
 
         // Prefer the live key; fall back to the held one only while sliding out.
@@ -162,6 +224,7 @@ fun CalendarHost(
             (createDateIso ?: heldCreateIso)?.let { iso ->
                 EventEditScreen(
                     initialDateIso = iso,
+                    initialStartMinutes = createStartMinutes ?: heldCreateMinutes,
                     onClose = { createDateIso = null },
                     onSaved = { createDateIso = null },
                 )
@@ -193,7 +256,40 @@ fun CalendarHost(
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
             exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
         ) {
-            SettingsScreen(onBack = { showSettings = false })
+            SettingsScreen(
+                onBack = { showSettings = false },
+                onManageCalendars = { showCalendars = true },
+            )
+        }
+
+        // Calendar manager — slides over Settings.
+        AnimatedVisibility(
+            visible = showCalendars,
+            enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
+            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+        ) {
+            CalendarsScreen(onBack = { showCalendars = false })
+        }
+
+        // Import flow for an opened/received .ics file. A single event routes
+        // into the create form (prefilled, for review); many open the picker.
+        importUri?.let { uri ->
+            ImportScreen(
+                uri = uri,
+                onClose = { importUri = null },
+                onOpenSingle = { form ->
+                    importUri = null
+                    importForm = form
+                },
+            )
+        }
+        importForm?.let { form ->
+            EventEditScreen(
+                initialDateIso = null,
+                initialForm = form,
+                onClose = { importForm = null },
+                onSaved = { importForm = null },
+            )
         }
     }
 }

app/src/main/java/de/jeanlucmakiola/calendula/ui/RootScreen.kt

@@ -25,6 +25,10 @@ fun RootScreen(
     modifier: Modifier = Modifier,
     requestedDetailKey: LongArray? = null,
     onDetailKeyConsumed: () -> Unit = {},
+    widgetNavRequest: WidgetNavRequest? = null,
+    onWidgetNavConsumed: () -> Unit = {},
+    requestedImportUri: android.net.Uri? = null,
+    onImportConsumed: () -> Unit = {},
 ) {
     val context = LocalContext.current
     var hasPermission by remember {
@@ -58,6 +62,10 @@ fun RootScreen(
                 modifier = modifier,
                 requestedDetailKey = requestedDetailKey,
                 onDetailKeyConsumed = onDetailKeyConsumed,
+                widgetNavRequest = widgetNavRequest,
+                onWidgetNavConsumed = onWidgetNavConsumed,
+                requestedImportUri = requestedImportUri,
+                onImportConsumed = onImportConsumed,
             )
             false -> ReminderOnboardingScreen(
                 onFinished = reminderOnboarding::finish,

app/src/main/java/de/jeanlucmakiola/calendula/ui/WidgetNavRequest.kt

@@ -0,0 +1,15 @@
+package de.jeanlucmakiola.calendula.ui
+
+/**
+ * A navigation a home-screen widget asked the app to perform when launched.
+ * Parsed from the launch intent in MainActivity and consumed once by
+ * [CalendarHost] (event taps reuse the existing reminder detail-key channel, so
+ * they are not modelled here).
+ */
+sealed interface WidgetNavRequest {
+    /** Open the day view anchored on [dateIso] (an ISO `yyyy-MM-dd` date). */
+    data class OpenDate(val dateIso: String) : WidgetNavRequest
+
+    /** Open the create-event form prefilled for [dateIso] (today when null). */
+    data class Create(val dateIso: String?) : WidgetNavRequest
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/agenda/AgendaScreen.kt

@@ -0,0 +1,344 @@
+package de.jeanlucmakiola.calendula.ui.agenda
+
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.background
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.EventAvailable
+import androidx.compose.material.icons.filled.Menu
+import androidx.compose.material3.DrawerValue
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.ModalNavigationDrawer
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.material3.TopAppBarScrollBehavior
+import androidx.compose.material3.rememberDrawerState
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.input.nestedscroll.nestedScroll
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.hilt.navigation.compose.hiltViewModel
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.ui.common.CalendarDrawer
+import de.jeanlucmakiola.calendula.ui.common.CalendarFabColumn
+import de.jeanlucmakiola.calendula.ui.common.CalendarFailure
+import de.jeanlucmakiola.calendula.ui.common.CalendarView
+import de.jeanlucmakiola.calendula.ui.common.GroupedRow
+import de.jeanlucmakiola.calendula.ui.common.Position
+import de.jeanlucmakiola.calendula.ui.common.ViewSwitcherPill
+import de.jeanlucmakiola.calendula.ui.common.next
+import de.jeanlucmakiola.calendula.ui.common.pastelize
+import de.jeanlucmakiola.calendula.ui.common.positionOf
+import kotlinx.coroutines.launch
+import kotlinx.datetime.DateTimeUnit
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.plus
+import kotlinx.datetime.toLocalDateTime
+import kotlin.time.Instant
+import java.time.format.TextStyle as JavaTextStyle
+import java.util.Locale
+
+private val zone = TimeZone.currentSystemDefault()
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun AgendaScreen(
+    selectedView: CalendarView,
+    onSelectView: (CalendarView) -> Unit,
+    onEventClick: (EventInstance) -> Unit,
+    onOpenSettings: () -> Unit,
+    onCreateEvent: (LocalDate, Int?) -> Unit,
+    modifier: Modifier = Modifier,
+    viewModel: AgendaViewModel = hiltViewModel(),
+) {
+    val state by viewModel.state.collectAsStateWithLifecycle()
+    val anchor by viewModel.anchor.collectAsStateWithLifecycle()
+
+    val scrollBehavior = TopAppBarDefaults.pinnedScrollBehavior()
+    val drawerState = rememberDrawerState(DrawerValue.Closed)
+    val scope = rememberCoroutineScope()
+
+    val isOnToday = when (val s = state) {
+        is AgendaUiState.Success -> s.anchor == s.today
+        else -> true
+    }
+
+    ModalNavigationDrawer(
+        drawerState = drawerState,
+        drawerContent = {
+            CalendarDrawer(
+                currentView = selectedView,
+                currentDate = anchor,
+                onSelectView = { view ->
+                    onSelectView(view)
+                    scope.launch { drawerState.close() }
+                },
+                onJumpToDate = { target ->
+                    viewModel.goToDate(target)
+                    scope.launch { drawerState.close() }
+                },
+                onSettings = {
+                    onOpenSettings()
+                    scope.launch { drawerState.close() }
+                },
+            )
+        },
+    ) {
+        Scaffold(
+            modifier = modifier.nestedScroll(scrollBehavior.nestedScrollConnection),
+            topBar = {
+                AgendaTopBar(
+                    selectedView = selectedView,
+                    onCycleView = { onSelectView(selectedView.next()) },
+                    onOpenDrawer = { scope.launch { drawerState.open() } },
+                    scrollBehavior = scrollBehavior,
+                )
+            },
+            floatingActionButton = {
+                CalendarFabColumn(
+                    todayVisible = !isOnToday,
+                    todayText = stringResource(R.string.agenda_today_action),
+                    onToday = viewModel::goToToday,
+                    onCreate = { onCreateEvent(anchor, null) },
+                )
+            },
+        ) { innerPadding ->
+            AgendaContent(
+                state = state,
+                onRetry = viewModel::goToToday,
+                onEventClick = onEventClick,
+                modifier = Modifier
+                    .padding(innerPadding)
+                    .fillMaxSize(),
+            )
+        }
+    }
+}
+
+@Composable
+private fun AgendaContent(
+    state: AgendaUiState,
+    onRetry: () -> Unit,
+    onEventClick: (EventInstance) -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    when (state) {
+        AgendaUiState.Loading -> Box(modifier)
+        is AgendaUiState.Failure -> Box(modifier) {
+            CalendarFailure(reason = state.reason, onRetry = onRetry)
+        }
+        is AgendaUiState.Success ->
+            if (state.days.isEmpty()) {
+                AgendaEmpty(modifier)
+            } else {
+                AgendaList(state = state, onEventClick = onEventClick, modifier = modifier)
+            }
+    }
+}
+
+@OptIn(ExperimentalFoundationApi::class)
+@Composable
+private fun AgendaList(
+    state: AgendaUiState.Success,
+    onEventClick: (EventInstance) -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    LazyColumn(
+        modifier = modifier,
+        // Bottom inset clears the FAB stack so the last row stays tappable.
+        contentPadding = PaddingValues(top = 8.dp, bottom = 96.dp),
+    ) {
+        state.days.forEach { day ->
+            stickyHeader(key = "header-${day.date}") {
+                AgendaDayHeader(date = day.date, today = state.today)
+            }
+            itemsIndexed(
+                items = day.events,
+                key = { _, event -> event.instanceId },
+            ) { index, event ->
+                AgendaEventRow(
+                    event = event,
+                    position = positionOf(index, day.events.size),
+                    onClick = { onEventClick(event) },
+                )
+            }
+            item(key = "gap-${day.date}") { Spacer(Modifier.height(8.dp)) }
+        }
+    }
+}
+
+@Composable
+private fun AgendaDayHeader(date: LocalDate, today: LocalDate) {
+    Surface(
+        color = MaterialTheme.colorScheme.surface,
+        modifier = Modifier.fillMaxWidth(),
+    ) {
+        Text(
+            text = agendaDayLabel(date, today),
+            style = MaterialTheme.typography.titleSmall,
+            color = if (date == today) {
+                MaterialTheme.colorScheme.primary
+            } else {
+                MaterialTheme.colorScheme.onSurfaceVariant
+            },
+            modifier = Modifier.padding(start = 28.dp, end = 28.dp, top = 16.dp, bottom = 8.dp),
+        )
+    }
+}
+
+@Composable
+private fun AgendaEventRow(
+    event: EventInstance,
+    position: Position,
+    onClick: () -> Unit,
+) {
+    val dark = isSystemInDarkTheme()
+    val title = event.title.ifBlank { stringResource(R.string.event_untitled) }
+    GroupedRow(
+        title = title,
+        summary = agendaTimeSummary(event),
+        position = position,
+        minHeight = 64.dp,
+        leading = {
+            Box(
+                modifier = Modifier
+                    .size(width = 6.dp, height = 36.dp)
+                    .clip(RoundedCornerShape(3.dp))
+                    .background(pastelize(event.color, dark)),
+            )
+        },
+        onClick = onClick,
+    )
+}
+
+@Composable
+private fun AgendaEmpty(modifier: Modifier = Modifier) {
+    Column(
+        modifier = modifier.padding(32.dp),
+        verticalArrangement = Arrangement.Center,
+        horizontalAlignment = Alignment.CenterHorizontally,
+    ) {
+        Icon(
+            imageVector = Icons.Filled.EventAvailable,
+            contentDescription = null,
+            tint = MaterialTheme.colorScheme.onSurfaceVariant,
+            modifier = Modifier.size(48.dp),
+        )
+        Spacer(Modifier.height(16.dp))
+        Text(
+            text = stringResource(R.string.agenda_empty_title),
+            style = MaterialTheme.typography.titleMedium,
+            textAlign = TextAlign.Center,
+        )
+        Spacer(Modifier.height(4.dp))
+        Text(
+            text = stringResource(R.string.agenda_empty_subtitle),
+            style = MaterialTheme.typography.bodyMedium,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+            textAlign = TextAlign.Center,
+        )
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun AgendaTopBar(
+    selectedView: CalendarView,
+    onCycleView: () -> Unit,
+    onOpenDrawer: () -> Unit,
+    scrollBehavior: TopAppBarScrollBehavior,
+) {
+    TopAppBar(
+        title = {
+            Text(
+                text = stringResource(R.string.view_agenda),
+                style = MaterialTheme.typography.titleLarge,
+            )
+        },
+        navigationIcon = {
+            IconButton(onClick = onOpenDrawer) {
+                Icon(
+                    imageVector = Icons.Default.Menu,
+                    contentDescription = stringResource(R.string.month_open_menu),
+                )
+            }
+        },
+        actions = {
+            ViewSwitcherPill(
+                current = selectedView,
+                onCycle = onCycleView,
+                modifier = Modifier.padding(end = 8.dp),
+            )
+        },
+        colors = TopAppBarDefaults.topAppBarColors(
+            containerColor = MaterialTheme.colorScheme.surface,
+            scrolledContainerColor = MaterialTheme.colorScheme.surfaceContainer,
+        ),
+        scrollBehavior = scrollBehavior,
+    )
+}
+
+/** "Today · Wed, 17. Jun 2026" — relative word for today/tomorrow, else the date. */
+@Composable
+private fun agendaDayLabel(date: LocalDate, today: LocalDate): String {
+    val relative = when (date) {
+        today -> stringResource(R.string.agenda_header_today)
+        today.plus(1, DateTimeUnit.DAY) -> stringResource(R.string.agenda_header_tomorrow)
+        else -> null
+    }
+    val formatted = formatAgendaDate(date)
+    return if (relative != null) "$relative · $formatted" else formatted
+}
+
+/** Time line under the title: "09:00 – 10:00 · Location", "All day", etc. */
+@Composable
+private fun agendaTimeSummary(event: EventInstance): String {
+    val time = if (event.isAllDay) {
+        stringResource(R.string.event_detail_all_day)
+    } else {
+        "${formatTime(event.start)} – ${formatTime(event.end)}"
+    }
+    val location = event.location?.takeIf { it.isNotBlank() }
+    return if (location != null) "$time · $location" else time
+}
+
+private fun formatTime(instant: Instant): String {
+    val t = instant.toLocalDateTime(zone).time
+    return "%02d:%02d".format(t.hour, t.minute)
+}
+
+private fun formatAgendaDate(date: LocalDate): String {
+    val locale = Locale.getDefault()
+    val java = java.time.LocalDate.of(date.year, date.month.ordinal + 1, date.day)
+    val weekday = java.dayOfWeek.getDisplayName(JavaTextStyle.SHORT, locale)
+    val monthName = java.month.getDisplayName(JavaTextStyle.SHORT, locale)
+    return "$weekday, ${date.day}. $monthName ${date.year}"
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/agenda/AgendaUiState.kt

@@ -0,0 +1,57 @@
+package de.jeanlucmakiola.calendula.ui.agenda
+
+import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.FailureReason
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.toLocalDateTime
+
+/** One calendar day with at least one event, for the agenda list. */
+data class AgendaDay(
+    val date: LocalDate,
+    /** Events on this day, all-day first then ascending by start time. */
+    val events: List<EventInstance>,
+)
+
+/**
+ * Group flat [instances] into forward-looking [AgendaDay]s (only days that
+ * actually carry events). An event that began before [anchor] (ongoing or
+ * multi-day) is clamped to the anchor day so it still surfaces on top. Within a
+ * day, all-day events sort first, then ascending by start time, then title.
+ *
+ * Shared by the Agenda screen and the agenda home-screen widget so both group
+ * and order identically.
+ */
+fun groupAgendaDays(
+    anchor: LocalDate,
+    instances: List<EventInstance>,
+    zone: TimeZone,
+): List<AgendaDay> =
+    instances
+        .groupBy { it.start.toLocalDateTime(zone).date.coerceAtLeast(anchor) }
+        .toSortedMap()
+        .map { (date, dayEvents) ->
+            AgendaDay(
+                date = date,
+                events = dayEvents.sortedWith(
+                    compareByDescending<EventInstance> { it.isAllDay }
+                        .thenBy { it.start }
+                        .thenBy { it.title },
+                ),
+            )
+        }
+
+/**
+ * State for the Agenda view: a flat, forward-looking list of upcoming events
+ * grouped by day (only days that actually have events appear).
+ */
+sealed interface AgendaUiState {
+    data object Loading : AgendaUiState
+    data class Failure(val reason: FailureReason) : AgendaUiState
+    data class Success(
+        /** First day of the loaded window (today, or a jumped-to date). */
+        val anchor: LocalDate,
+        val today: LocalDate,
+        val days: List<AgendaDay>,
+    ) : AgendaUiState
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/agenda/AgendaViewModel.kt

@@ -0,0 +1,96 @@
+package de.jeanlucmakiola.calendula.ui.agenda
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import dagger.hilt.android.lifecycle.HiltViewModel
+import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
+import de.jeanlucmakiola.calendula.data.di.IoDispatcher
+import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.FailureReason
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.catch
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.flatMapLatest
+import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.datetime.DateTimeUnit
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.atStartOfDayIn
+import kotlinx.datetime.atTime
+import kotlinx.datetime.plus
+import kotlinx.datetime.toInstant
+import kotlinx.datetime.toLocalDateTime
+import kotlin.time.Clock
+import kotlin.time.Instant
+import javax.inject.Inject
+
+/** How far ahead the agenda loads events from its anchor day. */
+internal const val AGENDA_WINDOW_DAYS = 60
+
+@OptIn(ExperimentalCoroutinesApi::class)
+@HiltViewModel
+class AgendaViewModel @Inject constructor(
+    private val repository: CalendarRepository,
+    @IoDispatcher private val io: CoroutineDispatcher,
+) : ViewModel() {
+
+    private val zone = TimeZone.currentSystemDefault()
+
+    private val todayDate: LocalDate
+        get() = Clock.System.now().toLocalDateTime(zone).date
+
+    private val _anchor = MutableStateFlow(todayDate)
+    val anchor: StateFlow<LocalDate> = _anchor
+
+    val state: StateFlow<AgendaUiState> = _anchor
+        .flatMapLatest { anchor ->
+            val range = agendaRange(anchor, AGENDA_WINDOW_DAYS, zone)
+            combine(
+                repository.calendars(),
+                repository.instances(range),
+            ) { calendars, instances ->
+                buildState(anchor, calendars, instances)
+            }
+        }
+        .catch { emit(AgendaUiState.Failure(FailureReason.ProviderUnavailable)) }
+        .flowOn(io)
+        .stateIn(
+            scope = viewModelScope,
+            started = SharingStarted.WhileSubscribed(5_000L),
+            initialValue = AgendaUiState.Loading,
+        )
+
+    fun goToToday() {
+        _anchor.value = todayDate
+    }
+
+    /** Jump the agenda window to start on a specific date (drawer jump-to-date). */
+    fun goToDate(date: LocalDate) {
+        _anchor.value = date
+    }
+
+    private fun buildState(
+        anchor: LocalDate,
+        calendars: List<CalendarSource>,
+        instances: List<EventInstance>,
+    ): AgendaUiState {
+        if (calendars.isEmpty()) {
+            return AgendaUiState.Failure(FailureReason.NoCalendarsConfigured)
+        }
+        val days = groupAgendaDays(anchor, instances, zone)
+        return AgendaUiState.Success(anchor = anchor, today = todayDate, days = days)
+    }
+}
+
+/** Inclusive instant range from the start of [anchor] through [days] days ahead. */
+internal fun agendaRange(anchor: LocalDate, days: Int, zone: TimeZone): ClosedRange<Instant> {
+    val from = anchor.atStartOfDayIn(zone)
+    val to = anchor.plus(days, DateTimeUnit.DAY).atTime(23, 59, 59).toInstant(zone)
+    return from..to
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/calendars/CalendarsScreen.kt

@@ -0,0 +1,571 @@
+package de.jeanlucmakiola.calendula.ui.calendars
+
+import android.accounts.AccountManager
+import android.content.Context
+import android.content.Intent
+import android.provider.Settings
+import androidx.activity.compose.BackHandler
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.background
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.automirrored.filled.Notes
+import androidx.compose.material.icons.filled.Add
+import androidx.compose.material.icons.filled.CalendarMonth
+import androidx.compose.material.icons.filled.Close
+import androidx.compose.material.icons.filled.Delete
+import androidx.compose.material.icons.filled.Edit
+import androidx.compose.material.icons.filled.FileDownload
+import androidx.compose.material.icons.filled.OpenInNew
+import androidx.compose.material.icons.filled.Palette
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.Button
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedButton
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.SnackbarHost
+import androidx.compose.material3.SnackbarHostState
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.input.KeyboardCapitalization
+import androidx.compose.ui.unit.dp
+import androidx.hilt.navigation.compose.hiltViewModel
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.ui.common.CALENDAR_COLOR_PALETTE
+import de.jeanlucmakiola.calendula.ui.common.CalendarColorChip
+import de.jeanlucmakiola.calendula.ui.common.CollapsingScaffold
+import de.jeanlucmakiola.calendula.ui.common.ColorSwatchRow
+import de.jeanlucmakiola.calendula.ui.common.GroupedRow
+import de.jeanlucmakiola.calendula.ui.common.InlineTextField
+import de.jeanlucmakiola.calendula.ui.common.Position
+import de.jeanlucmakiola.calendula.ui.common.pastelize
+import de.jeanlucmakiola.calendula.ui.common.positionOf
+import java.time.LocalDate
+
+/** Sentinel [editorId] meaning "the editor is composing a new calendar". */
+private const val NEW_CALENDAR_ID = Long.MIN_VALUE
+
+/**
+ * Calendar manager (reached from Settings). Lists the app's own device-only
+ * calendars with create / rename / recolor / delete (via a full-screen editor),
+ * and lists synced calendars read-only with a per-account "manage in the source
+ * app" deep-link — the app never touches a synced calendar's server. A
+ * full-screen destination; [onBack] pops it.
+ */
+@Composable
+fun CalendarsScreen(
+    onBack: () -> Unit,
+    viewModel: CalendarsViewModel = hiltViewModel(),
+) {
+    val calendars by viewModel.calendars.collectAsStateWithLifecycle()
+    val error by viewModel.error.collectAsStateWithLifecycle()
+    val backupResult by viewModel.backupResult.collectAsStateWithLifecycle()
+
+    // null = list; NEW_CALENDAR_ID = create; any other id = edit that calendar.
+    // [editorSession] bumps on every open so the editor's field state resets for
+    // a fresh open while still surviving configuration changes within one open.
+    var editorId by rememberSaveable { mutableStateOf<Long?>(null) }
+    var editorSession by rememberSaveable { mutableStateOf(0) }
+
+    if (editorId != null) {
+        val editing = calendars.firstOrNull { it.id == editorId }
+        CalendarEditor(
+            sessionKey = editorSession,
+            isNew = editorId == NEW_CALENDAR_ID,
+            initialName = editing?.displayName.orEmpty(),
+            initialColor = editing?.color ?: CALENDAR_COLOR_PALETTE.first(),
+            initialDescription = editing?.description.orEmpty(),
+            onSave = { name, color, description ->
+                val id = editorId
+                if (id == null || id == NEW_CALENDAR_ID) {
+                    viewModel.createCalendar(name, color, description)
+                } else {
+                    viewModel.updateCalendar(id, name, color, description)
+                }
+                editorId = null
+            },
+            onDelete = {
+                editorId?.takeIf { it != NEW_CALENDAR_ID }?.let(viewModel::deleteCalendar)
+                editorId = null
+            },
+            onClose = { editorId = null },
+        )
+    } else {
+        CalendarsList(
+            local = calendars.filter { it.isLocal },
+            synced = calendars.filterNot { it.isLocal },
+            error = error,
+            onConsumeError = viewModel::consumeError,
+            backupResult = backupResult,
+            onExportBackup = viewModel::exportBackup,
+            onConsumeBackupResult = viewModel::consumeBackupResult,
+            onBack = onBack,
+            onAdd = { editorSession++; editorId = NEW_CALENDAR_ID },
+            onEdit = { calendar -> editorSession++; editorId = calendar.id },
+        )
+    }
+}
+
+@Composable
+private fun CalendarsList(
+    local: List<CalendarSource>,
+    synced: List<CalendarSource>,
+    error: Boolean,
+    onConsumeError: () -> Unit,
+    backupResult: BackupResult?,
+    onExportBackup: (android.net.Uri) -> Unit,
+    onConsumeBackupResult: () -> Unit,
+    onBack: () -> Unit,
+    onAdd: () -> Unit,
+    onEdit: (CalendarSource) -> Unit,
+) {
+    val context = LocalContext.current
+    val snackbarHostState = remember { SnackbarHostState() }
+    val writeErrorText = stringResource(R.string.calendars_write_error)
+
+    LaunchedEffect(error) {
+        if (error) {
+            snackbarHostState.showSnackbar(writeErrorText)
+            onConsumeError()
+        }
+    }
+
+    // SAF "create document" target for the backup file. The picked Uri is handed
+    // to the VM to stream the .ics into.
+    val createBackup = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.CreateDocument("text/calendar"),
+    ) { uri -> uri?.let(onExportBackup) }
+
+    val backupFailedText = stringResource(R.string.calendars_backup_failed)
+    LaunchedEffect(backupResult) {
+        when (val r = backupResult) {
+            is BackupResult.Success -> {
+                snackbarHostState.showSnackbar(
+                    context.resources.getQuantityString(
+                        R.plurals.calendars_backup_done, r.eventCount, r.eventCount,
+                    ),
+                )
+                onConsumeBackupResult()
+            }
+            BackupResult.Failure -> {
+                snackbarHostState.showSnackbar(backupFailedText)
+                onConsumeBackupResult()
+            }
+            null -> Unit
+        }
+    }
+
+    CollapsingScaffold(
+        title = stringResource(R.string.calendars_title),
+        onBack = onBack,
+        snackbarHost = { SnackbarHost(snackbarHostState) },
+    ) {
+        // Local (device-only) calendars — the calendars the app owns. The
+        // "Add calendar" entry closes the group as its final row.
+        SectionHeader(stringResource(R.string.calendars_local_header))
+        if (local.isEmpty()) {
+            HintText(stringResource(R.string.calendars_local_empty))
+        }
+        val localCount = local.size + 1
+        local.forEachIndexed { index, calendar ->
+            GroupedRow(
+                title = calendar.displayName,
+                summary = calendar.description,
+                position = positionOf(index, localCount),
+                leading = { CalendarColorChip(calendar.color) },
+                trailing = {
+                    Icon(
+                        Icons.Default.Edit,
+                        contentDescription = stringResource(R.string.calendars_edit_title),
+                        tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                        modifier = Modifier.size(20.dp),
+                    )
+                },
+                onClick = { onEdit(calendar) },
+            )
+        }
+        GroupedRow(
+            title = stringResource(R.string.calendars_add),
+            position = positionOf(local.size, localCount),
+            leading = { AddAvatar() },
+            onClick = onAdd,
+        )
+
+        // Backup — local calendars have no sync, so a .ics export is their only
+        // safety net. Offered only when there is something to back up.
+        if (local.isNotEmpty()) {
+            Spacer(Modifier.height(16.dp))
+            SectionHeader(stringResource(R.string.calendars_backup_header))
+            HintText(stringResource(R.string.calendars_backup_hint))
+            GroupedRow(
+                title = stringResource(R.string.calendars_backup_action),
+                position = Position.Alone,
+                leading = { LeadingAvatar(Icons.Default.FileDownload) },
+                onClick = {
+                    runCatching { createBackup.launch("calendula-backup-${LocalDate.now()}.ics") }
+                },
+            )
+        }
+
+        Spacer(Modifier.height(16.dp))
+
+        // Synced calendars — read-only, grouped by account, each with a
+        // per-account "manage in source app" link.
+        SectionHeader(stringResource(R.string.calendars_synced_header))
+        HintText(stringResource(R.string.calendars_synced_hint))
+        synced
+            .groupBy { it.accountName.ifBlank { it.accountType } }
+            .forEach { (account, cals) ->
+                AccountHeader(account = account, accountType = cals.first().accountType)
+                cals.forEachIndexed { index, calendar ->
+                    GroupedRow(
+                        title = calendar.displayName,
+                        position = positionOf(index, cals.size),
+                        leading = { CalendarColorChip(calendar.color) },
+                    )
+                }
+            }
+        Spacer(Modifier.height(8.dp))
+        GroupedRow(
+            title = stringResource(R.string.calendars_add_account),
+            position = Position.Alone,
+            leading = { AddAvatar() },
+            onClick = {
+                runCatching { context.startActivity(Intent(Settings.ACTION_ADD_ACCOUNT)) }
+            },
+        )
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun CalendarEditor(
+    sessionKey: Int,
+    isNew: Boolean,
+    initialName: String,
+    initialColor: Int,
+    initialDescription: String,
+    onSave: (name: String, color: Int, description: String?) -> Unit,
+    onDelete: () -> Unit,
+    onClose: () -> Unit,
+) {
+    var name by rememberSaveable(sessionKey) { mutableStateOf(initialName) }
+    var color by rememberSaveable(sessionKey) { mutableStateOf(initialColor) }
+    var description by rememberSaveable(sessionKey) { mutableStateOf(initialDescription) }
+    var confirmDelete by remember { mutableStateOf(false) }
+    val dark = isSystemInDarkTheme()
+
+    BackHandler(onBack = onClose)
+
+    Scaffold(
+        modifier = Modifier
+            .fillMaxSize()
+            .background(MaterialTheme.colorScheme.surface),
+        topBar = {
+            TopAppBar(
+                title = {
+                    Text(
+                        stringResource(
+                            if (isNew) R.string.calendars_new_title
+                            else R.string.calendars_edit_title,
+                        ),
+                    )
+                },
+                navigationIcon = {
+                    IconButton(onClick = onClose) {
+                        Icon(
+                            Icons.Default.Close,
+                            contentDescription = stringResource(R.string.event_edit_close),
+                        )
+                    }
+                },
+                actions = {
+                    if (!isNew) {
+                        IconButton(onClick = { confirmDelete = true }) {
+                            Icon(
+                                Icons.Default.Delete,
+                                contentDescription = stringResource(R.string.event_detail_delete),
+                                tint = MaterialTheme.colorScheme.error,
+                            )
+                        }
+                    }
+                    // Filled save button, matching the event editor's top bar.
+                    Button(
+                        onClick = {
+                            onSave(name.trim(), color, description.trim().ifEmpty { null })
+                        },
+                        enabled = name.isNotBlank(),
+                        modifier = Modifier.padding(end = 12.dp),
+                    ) {
+                        Text(stringResource(R.string.event_edit_save))
+                    }
+                },
+                colors = TopAppBarDefaults.topAppBarColors(
+                    containerColor = MaterialTheme.colorScheme.surface,
+                ),
+            )
+        },
+    ) { innerPadding ->
+        Column(
+            modifier = Modifier
+                .padding(innerPadding)
+                .fillMaxSize()
+                .verticalScroll(rememberScrollState())
+                .padding(horizontal = 16.dp, vertical = 8.dp),
+            verticalArrangement = Arrangement.spacedBy(12.dp),
+        ) {
+            EditorCard(icon = Icons.Default.CalendarMonth, iconTint = pastelize(color, dark)) {
+                InlineTextField(
+                    value = name,
+                    onValueChange = { name = it },
+                    placeholder = stringResource(R.string.calendars_name_label),
+                    textStyle = MaterialTheme.typography.titleLarge,
+                    capitalization = KeyboardCapitalization.Sentences,
+                )
+            }
+            EditorCard(
+                icon = Icons.Default.Palette,
+                iconTint = MaterialTheme.colorScheme.onSurfaceVariant,
+                iconAtTop = true,
+            ) {
+                Text(
+                    text = stringResource(R.string.calendars_color_label),
+                    style = MaterialTheme.typography.labelLarge,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+                Spacer(Modifier.height(12.dp))
+                ColorSwatchRow(
+                    colors = CALENDAR_COLOR_PALETTE,
+                    selected = color,
+                    onSelect = { color = it },
+                    dark = dark,
+                )
+            }
+            EditorCard(
+                icon = Icons.AutoMirrored.Filled.Notes,
+                iconTint = MaterialTheme.colorScheme.onSurfaceVariant,
+                iconAtTop = true,
+            ) {
+                InlineTextField(
+                    value = description,
+                    onValueChange = { description = it },
+                    placeholder = stringResource(R.string.calendars_description_hint),
+                    singleLine = false,
+                    minLines = 2,
+                    capitalization = KeyboardCapitalization.Sentences,
+                )
+            }
+        }
+    }
+
+    if (confirmDelete) {
+        AlertDialog(
+            onDismissRequest = { confirmDelete = false },
+            title = { Text(stringResource(R.string.calendars_delete_confirm_title)) },
+            text = {
+                Text(stringResource(R.string.calendars_delete_confirm_message, initialName))
+            },
+            confirmButton = {
+                TextButton(onClick = {
+                    confirmDelete = false
+                    onDelete()
+                }) {
+                    Text(
+                        stringResource(R.string.event_detail_delete),
+                        color = MaterialTheme.colorScheme.error,
+                    )
+                }
+            },
+            dismissButton = {
+                TextButton(onClick = { confirmDelete = false }) {
+                    Text(stringResource(R.string.dialog_cancel))
+                }
+            },
+        )
+    }
+}
+
+/** Tonal field card matching the event editor's design (icon + content). */
+@Composable
+private fun EditorCard(
+    icon: ImageVector,
+    iconTint: Color,
+    iconAtTop: Boolean = false,
+    content: @Composable () -> Unit,
+) {
+    Surface(
+        color = MaterialTheme.colorScheme.surfaceContainerHigh,
+        shape = RoundedCornerShape(16.dp),
+        modifier = Modifier.fillMaxWidth(),
+    ) {
+        Row(
+            modifier = Modifier.padding(16.dp),
+            verticalAlignment = if (iconAtTop) Alignment.Top else Alignment.CenterVertically,
+        ) {
+            Icon(
+                imageVector = icon,
+                contentDescription = null,
+                tint = iconTint,
+                modifier = Modifier
+                    .padding(top = if (iconAtTop) 2.dp else 0.dp)
+                    .size(24.dp),
+            )
+            Spacer(Modifier.width(16.dp))
+            Column(modifier = Modifier.weight(1f)) { content() }
+        }
+    }
+}
+
+@Composable
+private fun AccountHeader(account: String, accountType: String) {
+    val context = LocalContext.current
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(start = 28.dp, end = 16.dp, top = 16.dp, bottom = 4.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        Text(
+            text = account,
+            style = MaterialTheme.typography.titleSmall,
+            fontWeight = FontWeight.SemiBold,
+            modifier = Modifier.weight(1f),
+        )
+        OutlinedButton(onClick = {
+            runCatching { context.startActivity(sourceAppIntent(context, accountType)) }
+        }) {
+            Icon(Icons.Default.OpenInNew, contentDescription = null, modifier = Modifier.size(16.dp))
+            Spacer(Modifier.width(6.dp))
+            Text(stringResource(R.string.calendars_manage_in_app))
+        }
+    }
+}
+
+/** Neutral circular chip carrying an arbitrary icon — matches [AddAvatar]'s shape. */
+@Composable
+private fun LeadingAvatar(icon: ImageVector) {
+    Box(
+        modifier = Modifier
+            .size(40.dp)
+            .clip(CircleShape)
+            .background(MaterialTheme.colorScheme.surfaceContainerHighest),
+        contentAlignment = Alignment.Center,
+    ) {
+        Icon(
+            icon,
+            contentDescription = null,
+            tint = MaterialTheme.colorScheme.onSurfaceVariant,
+            modifier = Modifier.size(22.dp),
+        )
+    }
+}
+
+/** Neutral circular chip with a "+" — the leading icon for add-actions. */
+@Composable
+private fun AddAvatar() {
+    Box(
+        modifier = Modifier
+            .size(40.dp)
+            .clip(CircleShape)
+            .background(MaterialTheme.colorScheme.surfaceContainerHighest),
+        contentAlignment = Alignment.Center,
+    ) {
+        Icon(
+            Icons.Default.Add,
+            contentDescription = null,
+            tint = MaterialTheme.colorScheme.onSurfaceVariant,
+            modifier = Modifier.size(22.dp),
+        )
+    }
+}
+
+@Composable
+private fun SectionHeader(text: String) {
+    Text(
+        text = text,
+        style = MaterialTheme.typography.labelLarge,
+        color = MaterialTheme.colorScheme.primary,
+        modifier = Modifier.padding(start = 24.dp, end = 24.dp, top = 16.dp, bottom = 4.dp),
+    )
+}
+
+@Composable
+private fun HintText(text: String) {
+    Text(
+        text = text,
+        style = MaterialTheme.typography.bodySmall,
+        color = MaterialTheme.colorScheme.onSurfaceVariant,
+        modifier = Modifier.padding(horizontal = 24.dp, vertical = 4.dp),
+    )
+}
+
+/**
+ * Pick the app to open for managing a synced calendar's account. The account's
+ * own authenticator package (resolved from [AccountManager], no permission
+ * needed) handles any sync provider — DAVx5, ICSx5, Nextcloud, … — and a small
+ * curated map redirects the few cases where the authenticator isn't the app to
+ * open (Google's authenticator is Play Services, but users want the Calendar
+ * app). Falls back to the system account settings when nothing launchable is
+ * found, so the button always lands somewhere sensible.
+ */
+private fun sourceAppIntent(context: Context, accountType: String): Intent {
+    val pm = context.packageManager
+    val candidates = buildList {
+        AccountManager.get(context).authenticatorTypes
+            .firstOrNull { it.type.equals(accountType, ignoreCase = true) }
+            ?.packageName
+            ?.let { add(it) }
+        curatedSourcePackage(accountType)?.let { add(it) }
+    }
+    for (pkg in candidates) {
+        pm.getLaunchIntentForPackage(pkg)?.let { return it }
+    }
+    return Intent(Settings.ACTION_SYNC_SETTINGS)
+}
+
+/** Preferred app for account types whose authenticator isn't the app to open. */
+private fun curatedSourcePackage(accountType: String): String? = when {
+    accountType.equals("com.google", ignoreCase = true) -> "com.google.android.calendar"
+    else -> null
+}
+

app/src/main/java/de/jeanlucmakiola/calendula/ui/calendars/CalendarsViewModel.kt

@@ -0,0 +1,113 @@
+package de.jeanlucmakiola.calendula.ui.calendars
+
+import android.net.Uri
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import dagger.hilt.android.lifecycle.HiltViewModel
+import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
+import de.jeanlucmakiola.calendula.data.di.IoDispatcher
+import de.jeanlucmakiola.calendula.data.ics.IcsExporter
+import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.ics.IcsWriter
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.catch
+import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import kotlin.coroutines.cancellation.CancellationException
+import kotlin.time.Clock
+import javax.inject.Inject
+
+/**
+ * Backs the calendar manager: lists every calendar (the screen splits them into
+ * the app's own local calendars and read-only/synced ones) and creates,
+ * renames, recolors or deletes the local calendars the app owns. Write failures
+ * flip [error] so the screen can surface a one-shot message.
+ */
+@HiltViewModel
+class CalendarsViewModel @Inject constructor(
+    private val repository: CalendarRepository,
+    private val icsExporter: IcsExporter,
+    @IoDispatcher private val io: CoroutineDispatcher,
+) : ViewModel() {
+
+    val calendars: StateFlow<List<CalendarSource>> =
+        repository.calendars()
+            .catch { emit(emptyList()) }
+            .flowOn(io)
+            .stateIn(
+                scope = viewModelScope,
+                started = SharingStarted.WhileSubscribed(5_000L),
+                initialValue = emptyList(),
+            )
+
+    private val _error = MutableStateFlow(false)
+    val error: StateFlow<Boolean> = _error.asStateFlow()
+
+    fun consumeError() { _error.value = false }
+
+    private val _backupResult = MutableStateFlow<BackupResult?>(null)
+    val backupResult: StateFlow<BackupResult?> = _backupResult.asStateFlow()
+
+    fun consumeBackupResult() { _backupResult.value = null }
+
+    /**
+     * Serialise every event of the writable local calendars into the chosen SAF
+     * document [uri] as one `VCALENDAR`. Result (event count, or failure) lands
+     * in [backupResult] for a one-shot message.
+     */
+    fun exportBackup(uri: Uri) {
+        viewModelScope.launch {
+            _backupResult.value = try {
+                val count = withContext(io) {
+                    val events = repository.exportEvents()
+                    icsExporter.writeDocument(
+                        uri = uri,
+                        content = IcsWriter().writeCalendar(events, Clock.System.now()),
+                    )
+                    events.size
+                }
+                BackupResult.Success(count)
+            } catch (e: CancellationException) {
+                throw e
+            } catch (e: Exception) {
+                BackupResult.Failure
+            }
+        }
+    }
+
+    fun createCalendar(displayName: String, color: Int, description: String?) = write {
+        repository.createLocalCalendar(displayName, color, description)
+    }
+
+    fun updateCalendar(id: Long, displayName: String, color: Int, description: String?) = write {
+        repository.updateCalendar(id, displayName, color, description)
+    }
+
+    fun deleteCalendar(id: Long) = write {
+        repository.deleteCalendar(id)
+    }
+
+    private inline fun write(crossinline block: suspend () -> Unit) {
+        viewModelScope.launch {
+            try {
+                block()
+            } catch (e: CancellationException) {
+                throw e
+            } catch (e: Exception) {
+                _error.value = true
+            }
+        }
+    }
+}
+
+/** Outcome of a whole-calendar backup, surfaced once to the screen. */
+sealed interface BackupResult {
+    data class Success(val eventCount: Int) : BackupResult
+    data object Failure : BackupResult
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/CalendarColors.kt

@@ -1,6 +1,20 @@
 package de.jeanlucmakiola.calendula.ui.common
 
+import androidx.compose.foundation.background
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.CalendarMonth
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.dp
 
 /**
  * Soften a raw calendar color toward a pastel that fits the active theme.
@@ -15,3 +29,27 @@ fun pastelize(rawArgb: Int, dark: Boolean): Color {
     hsv[2] = if (dark) 0.82f else 0.72f
     return Color(android.graphics.Color.HSVToColor(hsv))
 }
+
+/**
+ * Leading avatar for a calendar: a neutral chip holding a calendar glyph tinted
+ * in the calendar's (pastelised) colour. Shared by the calendar manager and the
+ * visibility filter so they read identically.
+ */
+@Composable
+fun CalendarColorChip(color: Int, modifier: Modifier = Modifier) {
+    val dark = isSystemInDarkTheme()
+    Box(
+        modifier = modifier
+            .size(40.dp)
+            .clip(CircleShape)
+            .background(MaterialTheme.colorScheme.surfaceContainerHighest),
+        contentAlignment = Alignment.Center,
+    ) {
+        Icon(
+            Icons.Filled.CalendarMonth,
+            contentDescription = null,
+            tint = pastelize(color, dark),
+            modifier = Modifier.size(22.dp),
+        )
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/CalendarDatePickerDialog.kt

@@ -0,0 +1,52 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.material3.DatePicker
+import androidx.compose.material3.DatePickerDialog
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.material3.rememberDatePickerState
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.res.stringResource
+import de.jeanlucmakiola.calendula.R
+import kotlinx.datetime.LocalDate
+
+/** One UTC day in milliseconds — the unit the M3 [DatePicker] speaks. */
+const val MILLIS_PER_DAY: Long = 86_400_000L
+
+/**
+ * The app's standard Material 3 date picker, opened on [initial] and reporting
+ * the chosen day through [onConfirm]. Shared by the event form (start/end date,
+ * RRULE until) and the drawer's jump-to-date action.
+ *
+ * DatePicker speaks UTC-midnight millis; epoch-day arithmetic keeps the
+ * conversion zone-proof in both directions.
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun CalendarDatePickerDialog(
+    initial: LocalDate,
+    onConfirm: (LocalDate) -> Unit,
+    onDismiss: () -> Unit,
+) {
+    val state = rememberDatePickerState(
+        initialSelectedDateMillis = initial.toEpochDays() * MILLIS_PER_DAY,
+    )
+    DatePickerDialog(
+        onDismissRequest = onDismiss,
+        confirmButton = {
+            TextButton(
+                onClick = {
+                    state.selectedDateMillis?.let { millis ->
+                        onConfirm(LocalDate.fromEpochDays((millis / MILLIS_PER_DAY).toInt()))
+                    }
+                },
+            ) { Text(stringResource(R.string.dialog_ok)) }
+        },
+        dismissButton = {
+            TextButton(onClick = onDismiss) { Text(stringResource(R.string.dialog_cancel)) }
+        },
+    ) {
+        DatePicker(state = state)
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/CalendarDrawer.kt

@@ -1,84 +1,154 @@
 package de.jeanlucmakiola.calendula.ui.common
 
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.requiredSize
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.DateRange
 import androidx.compose.material.icons.filled.Settings
-import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.ModalDrawerSheet
-import androidx.compose.material3.NavigationDrawerItem
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.res.colorResource
+import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import de.jeanlucmakiola.calendula.R
 import de.jeanlucmakiola.calendula.ui.filter.CalendarFilterList
+import kotlinx.datetime.LocalDate
 
 /**
  * Navigation drawer shared by every top-level calendar screen.
  *
- * Visual language (kept deliberately small so sizes don't drift):
- *  - Drawer title — `titleLarge`
- *  - Section headers (e.g. "Calendars") — `titleSmall`, primary, text only
- *  - Nav items (the views, Today / Settings) — Material `NavigationDrawerItem`
- *    (`labelLarge` label + a single 24dp leading icon)
+ * Uses the app's grouped-card design system (see [GroupedRow]): a branded
+ * header, the View switcher as a grouped card (the active view highlighted),
+ * a jump-to-date action, the per-calendar visibility filter (M3) inline, and a
+ * pinned Settings row. The "View" section mirrors the top-bar switcher pill —
+ * tapping a view here selects it (and closes the drawer) rather than cycling.
+ * The host screen owns the drawer state.
  *
- * The "View" section mirrors the top-bar switcher pill: tapping a view here
- * selects it (and closes the drawer) rather than cycling. Also hosts the
- * per-calendar visibility filter (M3) inline — the calendar list with its
- * checkboxes lives here rather than in a separate sheet — plus a Settings
- * entry (M4). The host screen owns the drawer state.
+ * [currentDate] seeds the jump-to-date picker (the visible day/week-start/month
+ * anchor); [onJumpToDate] navigates the active view to the chosen day.
  */
 @Composable
 fun CalendarDrawer(
     currentView: CalendarView,
+    currentDate: LocalDate,
     onSelectView: (CalendarView) -> Unit,
+    onJumpToDate: (LocalDate) -> Unit,
     onSettings: () -> Unit,
 ) {
+    var showDatePicker by remember { mutableStateOf(false) }
+
     ModalDrawerSheet {
-        Column(Modifier.fillMaxHeight()) {
+        // The whole sidebar scrolls as one — header, views, the calendar filter
+        // and Settings all flow in a single scroll container.
+        Column(
+            Modifier
+                .fillMaxHeight()
+                .verticalScroll(rememberScrollState()),
+        ) {
+            DrawerHeader()
+
+            DrawerSectionHeader(stringResource(R.string.view_section))
+            IMPLEMENTED_VIEWS.forEachIndexed { index, view ->
+                GroupedRow(
+                    title = stringResource(view.labelRes),
+                    position = positionOf(index, IMPLEMENTED_VIEWS.size),
+                    selected = view == currentView,
+                    minHeight = 56.dp,
+                    leading = { Icon(view.icon, contentDescription = null) },
+                    onClick = { onSelectView(view) },
+                )
+            }
+
+            Spacer(Modifier.height(16.dp))
+            GroupedRow(
+                title = stringResource(R.string.drawer_jump_to_date),
+                position = Position.Alone,
+                minHeight = 56.dp,
+                leading = { Icon(Icons.Filled.DateRange, contentDescription = null) },
+                onClick = { showDatePicker = true },
+            )
+
+            Spacer(Modifier.height(16.dp))
+
+            DrawerSectionHeader(stringResource(R.string.filter_title))
+            CalendarFilterList()
+
+            Spacer(Modifier.height(16.dp))
+            GroupedRow(
+                title = stringResource(R.string.month_action_settings),
+                position = Position.Alone,
+                minHeight = 56.dp,
+                leading = { Icon(Icons.Filled.Settings, contentDescription = null) },
+                onClick = onSettings,
+            )
+            Spacer(Modifier.height(8.dp))
+        }
+    }
+
+    if (showDatePicker) {
+        CalendarDatePickerDialog(
+            initial = currentDate,
+            onConfirm = {
+                showDatePicker = false
+                onJumpToDate(it)
+            },
+            onDismiss = { showDatePicker = false },
+        )
+    }
+}
+
+/** Branded header: the app-icon chip beside the app name. */
+@Composable
+private fun DrawerHeader() {
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(start = 28.dp, end = 28.dp, top = 24.dp, bottom = 16.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        Box(
+            modifier = Modifier
+                .size(44.dp)
+                .clip(RoundedCornerShape(14.dp))
+                .background(colorResource(R.color.ic_launcher_background)),
+            contentAlignment = Alignment.Center,
+        ) {
+            Image(
+                painter = painterResource(R.drawable.ic_launcher_foreground),
+                contentDescription = null,
+                modifier = Modifier.requiredSize(66.dp),
+            )
+        }
+        Spacer(Modifier.width(16.dp))
         Text(
             text = stringResource(R.string.app_name),
             style = MaterialTheme.typography.titleLarge,
-                modifier = Modifier.padding(horizontal = 28.dp, vertical = 24.dp),
         )
-            HorizontalDivider()
-
-            DrawerSectionHeader(stringResource(R.string.view_section))
-            IMPLEMENTED_VIEWS.forEach { view ->
-                NavigationDrawerItem(
-                    icon = { Icon(view.icon, contentDescription = null) },
-                    label = { Text(stringResource(view.labelRes)) },
-                    selected = view == currentView,
-                    onClick = { onSelectView(view) },
-                    modifier = Modifier.padding(horizontal = 12.dp),
-                )
-            }
-            Spacer(Modifier.height(8.dp))
-            HorizontalDivider()
-
-            // Calendars (M3) — visibility checkboxes, scrollable, takes the slack
-            // between the top actions and the pinned Settings entry.
-            DrawerSectionHeader(stringResource(R.string.filter_title))
-            CalendarFilterList(modifier = Modifier.weight(1f))
-
-            HorizontalDivider()
-            Spacer(Modifier.height(8.dp))
-            NavigationDrawerItem(
-                icon = { Icon(Icons.Filled.Settings, contentDescription = null) },
-                label = { Text(stringResource(R.string.month_action_settings)) },
-                selected = false,
-                onClick = onSettings,
-                modifier = Modifier.padding(horizontal = 12.dp),
-            )
-            Spacer(Modifier.height(8.dp))
-        }
     }
 }
 

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/CalendarView.kt

@@ -5,17 +5,16 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.CalendarViewDay
 import androidx.compose.material.icons.filled.CalendarViewMonth
 import androidx.compose.material.icons.filled.CalendarViewWeek
+import androidx.compose.material.icons.filled.ViewAgenda
 import androidx.compose.ui.graphics.vector.ImageVector
 import de.jeanlucmakiola.calendula.R
 
-/**
- * The top-level calendar views the user can switch between (spec M1).
- * Day is declared but not yet implemented (v0.5) — see [IMPLEMENTED_VIEWS].
- */
+/** The top-level calendar views the user can switch between (spec M1). */
 enum class CalendarView {
     Month,
     Week,
     Day,
+    Agenda,
 }
 
 /** Switcher label, shared by the top-bar pill and the drawer's View section. */
@@ -25,6 +24,7 @@ val CalendarView.labelRes: Int
         CalendarView.Month -> R.string.view_month
         CalendarView.Week -> R.string.view_week
         CalendarView.Day -> R.string.view_day
+        CalendarView.Agenda -> R.string.view_agenda
     }
 
 /** Leading icon for the view in the drawer's View section. */
@@ -33,6 +33,7 @@ val CalendarView.icon: ImageVector
         CalendarView.Month -> Icons.Filled.CalendarViewMonth
         CalendarView.Week -> Icons.Filled.CalendarViewWeek
         CalendarView.Day -> Icons.Filled.CalendarViewDay
+        CalendarView.Agenda -> Icons.Filled.ViewAgenda
     }
 
 /**
@@ -40,7 +41,7 @@ val CalendarView.icon: ImageVector
  * through these in order.
  */
 val IMPLEMENTED_VIEWS: List<CalendarView> =
-    listOf(CalendarView.Month, CalendarView.Week, CalendarView.Day)
+    listOf(CalendarView.Month, CalendarView.Week, CalendarView.Day, CalendarView.Agenda)
 
 /** Next view in [available], wrapping around. Falls back to Month if absent. */
 fun CalendarView.next(available: List<CalendarView> = IMPLEMENTED_VIEWS): CalendarView {

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/ColorSwatchRow.kt

@@ -0,0 +1,82 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.ExperimentalLayoutApi
+import androidx.compose.foundation.layout.FlowRow
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Check
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.dp
+
+/**
+ * A wrapping row of round colour swatches; the one matching [selected] is
+ * ringed and checked. Shared by the calendar editor and the event-colour
+ * picker so both pick a colour the same way. Swatches render through
+ * [pastelize] — the softened colour the app actually paints, not the raw hue.
+ */
+@OptIn(ExperimentalLayoutApi::class)
+@Composable
+fun ColorSwatchRow(
+    colors: List<Int>,
+    selected: Int?,
+    onSelect: (Int) -> Unit,
+    dark: Boolean,
+    modifier: Modifier = Modifier,
+) {
+    FlowRow(modifier = modifier, horizontalArrangement = Arrangement.spacedBy(12.dp)) {
+        colors.forEach { argb ->
+            val isSelected = argb == selected
+            Box(
+                contentAlignment = Alignment.Center,
+                modifier = Modifier
+                    .padding(vertical = 4.dp)
+                    .size(40.dp)
+                    .clip(CircleShape)
+                    .background(pastelize(argb, dark))
+                    .then(
+                        if (isSelected) {
+                            Modifier.border(2.dp, MaterialTheme.colorScheme.onSurface, CircleShape)
+                        } else {
+                            Modifier
+                        },
+                    )
+                    .clickable { onSelect(argb) },
+            ) {
+                if (isSelected) {
+                    Icon(
+                        Icons.Default.Check,
+                        contentDescription = null,
+                        tint = Color.Black.copy(alpha = 0.7f),
+                        modifier = Modifier.size(20.dp),
+                    )
+                }
+            }
+        }
+    }
+}
+
+/** Google-Calendar-style palette; ARGB ints for a raw `CALENDAR_COLOR` / `EVENT_COLOR`. */
+val CALENDAR_COLOR_PALETTE: List<Int> = listOf(
+    0xFFD50000, // red
+    0xFFE67C00, // orange
+    0xFFF6BF26, // amber
+    0xFF33B679, // green
+    0xFF0B8043, // dark green
+    0xFF039BE5, // blue
+    0xFF3F51B5, // indigo
+    0xFF8E24AA, // purple
+    0xFF616161, // graphite
+).map { it.toInt() }

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/DialogControls.kt

@@ -0,0 +1,94 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.ArrowDropDown
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.unit.dp
+
+/**
+ * Tonal 3-digit number input shared by the custom reminder/recurrence steps and
+ * the reminder pickers — the app's [InlineTextField] over a tonal surface, so it
+ * matches the card/grouped-row design language (not Material's outlined field).
+ */
+@Composable
+fun DialogAmountField(
+    value: String,
+    onValueChange: (String) -> Unit,
+    placeholder: String,
+) {
+    // surfaceContainerHighest — the picker/dialog sits on surfaceContainerHigh,
+    // so anything lower vanishes.
+    Surface(
+        color = MaterialTheme.colorScheme.surfaceContainerHighest,
+        shape = RoundedCornerShape(12.dp),
+    ) {
+        InlineTextField(
+            value = value,
+            onValueChange = { text ->
+                if (text.length <= 3 && text.all(Char::isDigit)) onValueChange(text)
+            },
+            placeholder = placeholder,
+            textStyle = MaterialTheme.typography.titleMedium,
+            keyboardType = KeyboardType.Number,
+            modifier = Modifier
+                .width(72.dp)
+                .padding(horizontal = 14.dp, vertical = 12.dp),
+        )
+    }
+}
+
+/** Tonal dropdown trigger + menu shared by the custom reminder/recurrence steps and pickers. */
+@Composable
+fun DialogUnitDropdown(
+    label: String,
+    entries: List<String>,
+    onPick: (Int) -> Unit,
+) {
+    var open by remember { mutableStateOf(false) }
+    Box {
+        Surface(
+            color = MaterialTheme.colorScheme.surfaceContainerHighest,
+            shape = RoundedCornerShape(12.dp),
+            onClick = { open = true },
+        ) {
+            Row(
+                verticalAlignment = Alignment.CenterVertically,
+                modifier = Modifier.padding(start = 14.dp, end = 8.dp, top = 12.dp, bottom = 12.dp),
+            ) {
+                Text(text = label, style = MaterialTheme.typography.titleMedium)
+                Spacer(Modifier.width(4.dp))
+                Icon(imageVector = Icons.Default.ArrowDropDown, contentDescription = null)
+            }
+        }
+        DropdownMenu(expanded = open, onDismissRequest = { open = false }) {
+            entries.forEachIndexed { index, entry ->
+                DropdownMenuItem(
+                    text = { Text(entry) },
+                    onClick = {
+                        onPick(index)
+                        open = false
+                    },
+                )
+            }
+        }
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/GroupedList.kt

@@ -0,0 +1,205 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.activity.compose.BackHandler
+import androidx.compose.animation.core.animateDpAsState
+import androidx.compose.foundation.background
+import androidx.compose.foundation.interaction.MutableInteractionSource
+import androidx.compose.foundation.interaction.collectIsPressedAsState
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.layout.RowScope
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.consumeWindowInsets
+import androidx.compose.foundation.layout.heightIn
+import androidx.compose.foundation.layout.imePadding
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.LargeTopAppBar
+import androidx.compose.material3.ListItem
+import androidx.compose.material3.ListItemDefaults
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.material3.rememberTopAppBarState
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.input.nestedscroll.nestedScroll
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+import de.jeanlucmakiola.calendula.R
+
+/**
+ * Position of a row within a grouped list, after the Android-15 settings
+ * pattern: a run of rows shares one rounded container, with full corners at the
+ * group's outer edges and small corners between, separated by small gaps.
+ */
+enum class Position { Top, Middle, Bottom, Alone }
+
+/** Maps an index within a group of [count] rows to its [Position]. */
+fun positionOf(index: Int, count: Int): Position = when {
+    count <= 1 -> Position.Alone
+    index == 0 -> Position.Top
+    index == count - 1 -> Position.Bottom
+    else -> Position.Middle
+}
+
+/**
+ * The app's standard full-screen list scaffold: a collapsing [LargeTopAppBar]
+ * whose title shrinks into the bar (next to the back button) as the content
+ * scrolls. Content is a scrollable column that feeds the toolbar via nested
+ * scroll. Used by Settings and the calendar manager so they share one shell.
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun CollapsingScaffold(
+    title: String,
+    onBack: () -> Unit,
+    modifier: Modifier = Modifier,
+    snackbarHost: @Composable () -> Unit = {},
+    actions: @Composable RowScope.() -> Unit = {},
+    content: @Composable ColumnScope.() -> Unit,
+) {
+    BackHandler(onBack = onBack)
+    val scrollBehavior =
+        TopAppBarDefaults.exitUntilCollapsedScrollBehavior(rememberTopAppBarState())
+    Scaffold(
+        modifier = modifier
+            .fillMaxSize()
+            .background(MaterialTheme.colorScheme.surface)
+            .nestedScroll(scrollBehavior.nestedScrollConnection),
+        topBar = {
+            LargeTopAppBar(
+                title = { Text(title) },
+                navigationIcon = {
+                    IconButton(onClick = onBack) {
+                        Icon(
+                            Icons.AutoMirrored.Filled.ArrowBack,
+                            contentDescription = stringResource(R.string.settings_back),
+                        )
+                    }
+                },
+                actions = actions,
+                scrollBehavior = scrollBehavior,
+                colors = TopAppBarDefaults.topAppBarColors(
+                    scrolledContainerColor = MaterialTheme.colorScheme.surface,
+                ),
+            )
+        },
+        snackbarHost = snackbarHost,
+    ) { innerPadding ->
+        Column(
+            modifier = Modifier
+                .padding(innerPadding)
+                // Mark the scaffold's system-bar insets as consumed so the
+                // imePadding below adds only the keyboard height beyond them
+                // (max, not sum) — otherwise the nav-bar inset double-counts and
+                // leaves an empty strip above the keyboard.
+                .consumeWindowInsets(innerPadding)
+                .fillMaxSize()
+                // Paint the surface across the full area before imePadding carves
+                // into it, so any sliver above the keyboard reads as surface — not
+                // the dialog window's black — during the IME animation.
+                .background(MaterialTheme.colorScheme.surface)
+                // Shrink the scroll viewport by the keyboard inset so a focused
+                // field (e.g. the custom-reminder amount) can scroll into view.
+                .imePadding()
+                .verticalScroll(rememberScrollState())
+                .padding(top = 8.dp, bottom = 24.dp),
+            content = content,
+        )
+    }
+}
+
+/**
+ * One row in a grouped list: an M3 [ListItem] over a tonal [Surface] whose
+ * corner radii come from its [position] (so a run of rows reads as a single
+ * rounded card). Corners round further on press. A null [onClick] makes the
+ * row non-interactive (e.g. read-only entries).
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun GroupedRow(
+    title: String,
+    position: Position,
+    modifier: Modifier = Modifier,
+    summary: String? = null,
+    selected: Boolean = false,
+    minHeight: Dp = 72.dp,
+    leading: @Composable (() -> Unit)? = null,
+    trailing: @Composable (() -> Unit)? = null,
+    onClick: (() -> Unit)? = null,
+) {
+    val interaction = remember { MutableInteractionSource() }
+    val pressed by interaction.collectIsPressedAsState()
+    val full by animateDpAsState(if (pressed) 36.dp else 22.dp, label = "fullCorner")
+    val small by animateDpAsState(if (pressed) 36.dp else 6.dp, label = "smallCorner")
+    val shape = when (position) {
+        Position.Alone -> RoundedCornerShape(full)
+        Position.Top -> RoundedCornerShape(
+            topStart = full, topEnd = full, bottomStart = small, bottomEnd = small,
+        )
+        Position.Middle -> RoundedCornerShape(small)
+        Position.Bottom -> RoundedCornerShape(
+            topStart = small, topEnd = small, bottomStart = full, bottomEnd = full,
+        )
+    }
+    val gap = when (position) {
+        Position.Top, Position.Middle -> Modifier.padding(bottom = 2.dp)
+        Position.Bottom, Position.Alone -> Modifier
+    }
+    val itemColors = if (selected) {
+        ListItemDefaults.colors(
+            containerColor = Color.Transparent,
+            headlineColor = MaterialTheme.colorScheme.onSecondaryContainer,
+            leadingIconColor = MaterialTheme.colorScheme.onSecondaryContainer,
+            supportingColor = MaterialTheme.colorScheme.onSecondaryContainer,
+            trailingIconColor = MaterialTheme.colorScheme.onSecondaryContainer,
+        )
+    } else {
+        ListItemDefaults.colors(containerColor = Color.Transparent)
+    }
+    val item: @Composable () -> Unit = {
+        ListItem(
+            headlineContent = { Text(title) },
+            supportingContent = summary?.let { text -> { Text(text) } },
+            leadingContent = leading,
+            trailingContent = trailing,
+            colors = itemColors,
+            modifier = Modifier.heightIn(min = minHeight),
+        )
+    }
+    val base = modifier
+        .fillMaxWidth()
+        .padding(horizontal = 16.dp)
+        .then(gap)
+    val containerColor = if (selected) {
+        MaterialTheme.colorScheme.secondaryContainer
+    } else {
+        MaterialTheme.colorScheme.surfaceContainerHigh
+    }
+    if (onClick != null) {
+        Surface(
+            onClick = onClick,
+            color = containerColor,
+            shape = shape,
+            interactionSource = interaction,
+            modifier = base,
+        ) { item() }
+    } else {
+        Surface(color = containerColor, shape = shape, modifier = base) { item() }
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/InlineTextField.kt

@@ -0,0 +1,74 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.text.BasicTextField
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.SolidColor
+import androidx.compose.ui.graphics.isSpecified
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.input.KeyboardCapitalization
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.unit.dp
+
+/**
+ * The app's borderless text input: no underline, no outline, just the tonal
+ * card behind it. This is the standard input across the app — we deliberately
+ * don't use Material's outlined/filled text fields, so anything that takes text
+ * (the event form, the calendar manager, dialogs) uses this inside a tonal
+ * [androidx.compose.material3.Surface].
+ */
+@Composable
+fun InlineTextField(
+    value: String,
+    onValueChange: (String) -> Unit,
+    placeholder: String,
+    modifier: Modifier = Modifier
+        .fillMaxWidth()
+        .padding(vertical = 4.dp),
+    textStyle: TextStyle = MaterialTheme.typography.titleMedium,
+    singleLine: Boolean = true,
+    minLines: Int = 1,
+    keyboardType: KeyboardType = KeyboardType.Text,
+    capitalization: KeyboardCapitalization = KeyboardCapitalization.None,
+) {
+    val resolvedStyle = textStyle.copy(
+        color = if (textStyle.color.isSpecified) {
+            textStyle.color
+        } else {
+            MaterialTheme.colorScheme.onSurface
+        },
+    )
+    BasicTextField(
+        value = value,
+        onValueChange = onValueChange,
+        textStyle = resolvedStyle,
+        singleLine = singleLine,
+        minLines = minLines,
+        keyboardOptions = KeyboardOptions(
+            keyboardType = keyboardType,
+            capitalization = capitalization,
+        ),
+        cursorBrush = SolidColor(MaterialTheme.colorScheme.primary),
+        decorationBox = { innerTextField ->
+            Box {
+                if (value.isEmpty()) {
+                    // Clearly fainter than typed text, so a hint never reads as
+                    // prefilled content.
+                    Text(
+                        text = placeholder,
+                        style = resolvedStyle,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f),
+                    )
+                }
+                innerTextField()
+            }
+        },
+        modifier = modifier,
+    )
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/Picker.kt

@@ -0,0 +1,282 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Check
+import androidx.compose.material3.FilledTonalButton
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.SegmentedButton
+import androidx.compose.material3.SegmentedButtonDefaults
+import androidx.compose.material3.SingleChoiceSegmentedButtonRow
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import android.view.WindowManager
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.SideEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalView
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.window.Dialog
+import androidx.compose.ui.window.DialogProperties
+import androidx.compose.ui.window.DialogWindowProvider
+import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.data.prefs.CalendarReminderOverride
+
+/**
+ * Shared full-screen scaffold for selection pickers: a full-bleed [Dialog] that
+ * reuses the app's [CollapsingScaffold] (collapsing title + back button), so a
+ * picker is visually identical to a Settings sub-page and uses the full width.
+ * [content] places the connected grouped rows; selecting one calls [onDismiss].
+ */
+@Composable
+fun FullScreenPicker(
+    title: String,
+    onDismiss: () -> Unit,
+    content: @Composable ColumnScope.() -> Unit,
+) {
+    Dialog(
+        onDismissRequest = onDismiss,
+        properties = DialogProperties(
+            usePlatformDefaultWidth = false,
+            decorFitsSystemWindows = false,
+        ),
+    ) {
+        // The dialog window pans by default when the keyboard opens, which —
+        // combined with the content's own imePadding — leaves a fixed black gap
+        // above the keyboard. Switch it to ADJUST_NOTHING so the window stays
+        // full-screen and imePadding alone lifts the focused field.
+        val view = LocalView.current
+        SideEffect {
+            (view.parent as? DialogWindowProvider)?.window
+                ?.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_NOTHING)
+        }
+        CollapsingScaffold(title = title, onBack = onDismiss, content = content)
+    }
+}
+
+/**
+ * General single-select picker, full-screen: each option is a connected grouped
+ * row and the current one carries a check. Drop-in for the former dialog
+ * (theme, week start, language, …).
+ */
+@Composable
+fun <T> OptionPicker(
+    title: String,
+    options: List<T>,
+    selected: T,
+    label: @Composable (T) -> String,
+    onSelect: (T) -> Unit,
+    onDismiss: () -> Unit,
+) {
+    FullScreenPicker(title = title, onDismiss = onDismiss) {
+        options.forEachIndexed { index, option ->
+            val isSelected = option == selected
+            GroupedRow(
+                title = label(option),
+                position = positionOf(index, options.size),
+                selected = isSelected,
+                trailing = if (isSelected) {
+                    { SelectedCheck() }
+                } else {
+                    null
+                },
+                onClick = {
+                    onSelect(option)
+                    onDismiss()
+                },
+            )
+        }
+    }
+}
+
+/**
+ * Reminder-default picker, full-screen: the grouped list (with an optional "Use
+ * default reminder" row and a "None" row), the [presets] as lead-time rows, and
+ * a "Custom" row that expands an inline number field plus a segmented unit
+ * selector. Returns the choice as a [CalendarReminderOverride].
+ */
+@Composable
+fun ReminderDefaultPicker(
+    title: String,
+    presets: List<Int>,
+    selected: CalendarReminderOverride,
+    allowInherit: Boolean,
+    onSelect: (CalendarReminderOverride) -> Unit,
+    onDismiss: () -> Unit,
+) {
+    val selectedMinutes = (selected as? CalendarReminderOverride.Minutes)?.minutes
+    val customSelected = selectedMinutes != null && selectedMinutes !in presets
+    val seed = decomposeReminder(selectedMinutes?.takeIf { customSelected })
+
+    var customExpanded by rememberSaveable { mutableStateOf(false) }
+    var amountText by rememberSaveable { mutableStateOf(seed.first) }
+    var unit by rememberSaveable { mutableStateOf(seed.second) }
+
+    val options = buildList {
+        if (allowInherit) add(CalendarReminderOverride.Inherit)
+        add(CalendarReminderOverride.None)
+        presets.forEach { add(CalendarReminderOverride.Minutes(it)) }
+    }
+    val rowCount = options.size + 1 // + the custom row
+
+    FullScreenPicker(title = title, onDismiss = onDismiss) {
+        options.forEachIndexed { index, option ->
+            val isSelected = option == selected
+            GroupedRow(
+                title = reminderOverrideLabel(option),
+                position = positionOf(index, rowCount),
+                selected = isSelected,
+                trailing = if (isSelected) {
+                    { SelectedCheck() }
+                } else {
+                    null
+                },
+                onClick = {
+                    onSelect(option)
+                    onDismiss()
+                },
+            )
+        }
+        // When expanded, the Custom row connects downward into the editor card
+        // so the two read as one grouped container (the per-calendar pattern).
+        GroupedRow(
+            title = if (customSelected) {
+                stringResource(
+                    R.string.reminder_custom_with_value,
+                    reminderLeadTimeLabel(selectedMinutes!!),
+                )
+            } else {
+                stringResource(R.string.event_edit_reminder_custom)
+            },
+            position = if (customExpanded) Position.Top else positionOf(options.size, rowCount),
+            selected = customSelected,
+            trailing = if (customSelected) {
+                { SelectedCheck() }
+            } else {
+                null
+            },
+            onClick = { customExpanded = !customExpanded },
+        )
+        AnimatedVisibility(visible = customExpanded) {
+            CustomReminderEditor(
+                amountText = amountText,
+                onAmountChange = { amountText = it },
+                unit = unit,
+                onUnitChange = { unit = it },
+                onConfirm = { minutes ->
+                    onSelect(CalendarReminderOverride.Minutes(minutes))
+                    onDismiss()
+                },
+            )
+        }
+    }
+}
+
+/**
+ * The expanded "Custom" lead-time editor: a tonal card connected to the Custom
+ * row above it (matching the grouped-row system, so the two read as one
+ * container). An amount field with a live preview of the resulting lead time, a
+ * single-choice unit toggle, and a tonal confirm enabled only for a valid
+ * 1–999 amount. [onConfirm] receives the final lead time in minutes.
+ */
+@Composable
+private fun CustomReminderEditor(
+    amountText: String,
+    onAmountChange: (String) -> Unit,
+    unit: ReminderUnit,
+    onUnitChange: (ReminderUnit) -> Unit,
+    onConfirm: (Int) -> Unit,
+) {
+    val amount = amountText.toIntOrNull()?.takeIf { it in 1..999 }
+    Surface(
+        color = MaterialTheme.colorScheme.surfaceContainerHigh,
+        // A Position.Bottom shape: tight top corners meeting the row, full bottom.
+        shape = RoundedCornerShape(topStart = 6.dp, topEnd = 6.dp, bottomStart = 22.dp, bottomEnd = 22.dp),
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(horizontal = 16.dp),
+    ) {
+        Column(
+            modifier = Modifier.padding(16.dp),
+            verticalArrangement = Arrangement.spacedBy(16.dp),
+        ) {
+            // Unit toggle first so it stays visible above the keyboard once the
+            // amount field (the bottom row) is focused and scrolled into view.
+            SingleChoiceSegmentedButtonRow(modifier = Modifier.fillMaxWidth()) {
+                ReminderUnit.entries.forEachIndexed { index, entry ->
+                    SegmentedButton(
+                        selected = unit == entry,
+                        onClick = { onUnitChange(entry) },
+                        shape = SegmentedButtonDefaults.itemShape(index, ReminderUnit.entries.size),
+                        label = { Text(stringResource(reminderUnitLabel(entry))) },
+                    )
+                }
+            }
+            // Amount, a live preview of the lead time it resolves to, and Set —
+            // all on one row, sitting just above the keyboard.
+            Row(verticalAlignment = Alignment.CenterVertically) {
+                DialogAmountField(
+                    value = amountText,
+                    onValueChange = onAmountChange,
+                    placeholder = "10",
+                )
+                Spacer(Modifier.width(16.dp))
+                Text(
+                    text = amount?.let { reminderLeadTimeLabel(it * unit.minutesFactor) }
+                        ?: stringResource(R.string.reminder_custom_amount),
+                    style = MaterialTheme.typography.bodyLarge,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    modifier = Modifier.weight(1f),
+                )
+                Spacer(Modifier.width(16.dp))
+                FilledTonalButton(
+                    onClick = { amount?.let { onConfirm(it * unit.minutesFactor) } },
+                    enabled = amount != null,
+                ) {
+                    Text(stringResource(R.string.reminder_custom_set))
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun SelectedCheck() {
+    Icon(
+        imageVector = Icons.Default.Check,
+        contentDescription = null,
+        tint = MaterialTheme.colorScheme.primary,
+    )
+}
+
+@Composable
+private fun reminderOverrideLabel(override: CalendarReminderOverride): String = when (override) {
+    CalendarReminderOverride.Inherit -> stringResource(R.string.reminder_use_default)
+    CalendarReminderOverride.None -> stringResource(R.string.reminder_none)
+    is CalendarReminderOverride.Minutes -> reminderLeadTimeLabel(override.minutes)
+}
+
+/** Seed the custom editor: the largest exact unit for [minutes] (null → empty). */
+private fun decomposeReminder(minutes: Int?): Pair<String, ReminderUnit> = when {
+    minutes == null -> "" to ReminderUnit.Minutes
+    minutes % 10_080 == 0 -> (minutes / 10_080).toString() to ReminderUnit.Weeks
+    minutes % 1_440 == 0 -> (minutes / 1_440).toString() to ReminderUnit.Days
+    minutes % 60 == 0 -> (minutes / 60).toString() to ReminderUnit.Hours
+    else -> minutes.toString() to ReminderUnit.Minutes
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/ReminderFormatting.kt

@@ -0,0 +1,46 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.annotation.StringRes
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.res.pluralStringResource
+import androidx.compose.ui.res.stringResource
+import de.jeanlucmakiola.calendula.R
+
+/** Common reminder lead times offered as quick picks in the form and settings. */
+val REMINDER_PRESETS = listOf(0, 10, 30, 60, 1_440)
+
+/** The unit of a custom reminder lead time; [minutesFactor] converts to minutes. */
+enum class ReminderUnit(val minutesFactor: Int) {
+    Minutes(1),
+    Hours(60),
+    Days(1_440),
+    Weeks(10_080),
+}
+
+@StringRes
+fun reminderUnitLabel(unit: ReminderUnit): Int = when (unit) {
+    ReminderUnit.Minutes -> R.string.reminder_unit_minutes
+    ReminderUnit.Hours -> R.string.reminder_unit_hours
+    ReminderUnit.Days -> R.string.reminder_unit_days
+    ReminderUnit.Weeks -> R.string.reminder_unit_weeks
+}
+
+/**
+ * Humanise a reminder lead time (minutes before the event start) into one
+ * line: "Default reminder" (negative = the provider default), "At time of
+ * event" (0), "10 minutes before", "1 hour before", … Shared by the detail
+ * screen, the event form and the default-reminder settings so the wording
+ * never drifts.
+ */
+@Composable
+fun reminderLeadTimeLabel(minutes: Int): String = when {
+    minutes < 0 -> stringResource(R.string.reminder_default)
+    minutes == 0 -> stringResource(R.string.reminder_at_time)
+    minutes % 10_080 == 0 ->
+        pluralStringResource(R.plurals.reminder_weeks, minutes / 10_080, minutes / 10_080)
+    minutes % 1_440 == 0 ->
+        pluralStringResource(R.plurals.reminder_days, minutes / 1_440, minutes / 1_440)
+    minutes % 60 == 0 ->
+        pluralStringResource(R.plurals.reminder_hours, minutes / 60, minutes / 60)
+    else -> pluralStringResource(R.plurals.reminder_minutes, minutes, minutes)
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/TimePickerAlert.kt

@@ -0,0 +1,68 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import android.content.Context
+import android.content.res.Resources
+import android.provider.Settings
+import android.text.format.DateFormat
+import androidx.compose.material3.TimePicker
+import androidx.compose.material3.rememberTimePickerState
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import de.jeanlucmakiola.calendula.R
+import kotlinx.datetime.LocalTime
+
+/**
+ * M3 time picker in an alert dialog, seeded with [initial]. Shared by the event
+ * form (start/end times) and Settings (the all-day reminder fire time).
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun TimePickerAlert(
+    initial: LocalTime,
+    onConfirm: (LocalTime) -> Unit,
+    onDismiss: () -> Unit,
+) {
+    val state = rememberTimePickerState(
+        initialHour = initial.hour,
+        initialMinute = initial.minute,
+        is24Hour = deviceUses24HourClock(LocalContext.current),
+    )
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        confirmButton = {
+            TextButton(onClick = { onConfirm(LocalTime(state.hour, state.minute)) }) {
+                Text(stringResource(R.string.dialog_ok))
+            }
+        },
+        dismissButton = {
+            TextButton(onClick = onDismiss) { Text(stringResource(R.string.dialog_cancel)) }
+        },
+        text = { TimePicker(state = state) },
+    )
+}
+
+/**
+ * Whether the clock should read 24-hour, matching the rest of the device.
+ *
+ * [DateFormat.is24HourFormat] resolves a "locale default" system setting against
+ * the *app's* context locale — and this app applies a per-app language
+ * (AppCompatDelegate), so an English UI on a German-region phone would wrongly
+ * read 12-hour while the system clock shows 24-hour. So we honour an explicit
+ * system 12/24 override, and otherwise fall back to the **device** locale
+ * (Resources.getSystem), not the app's.
+ */
+private fun deviceUses24HourClock(context: Context): Boolean =
+    when (Settings.System.getString(context.contentResolver, Settings.System.TIME_12_24)) {
+        "24" -> true
+        "12" -> false
+        // 'a' is the AM/PM marker; a best-fit pattern without it is 24-hour.
+        else -> {
+            val deviceLocale = Resources.getSystem().configuration.locales[0]
+            !DateFormat.getBestDateTimePattern(deviceLocale, "jm").contains('a')
+        }
+    }

app/src/main/java/de/jeanlucmakiola/calendula/ui/day/DayScreen.kt

@@ -6,6 +6,7 @@ import androidx.compose.animation.core.animateDpAsState
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.gestures.detectHorizontalDragGestures
+import androidx.compose.foundation.gestures.detectTapGestures
 import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.BoxWithConstraints
@@ -104,7 +105,7 @@ fun DayScreen(
     onSelectView: (CalendarView) -> Unit,
     onEventClick: (EventInstance) -> Unit,
     onOpenSettings: () -> Unit,
-    onCreateEvent: (LocalDate) -> Unit,
+    onCreateEvent: (LocalDate, Int?) -> Unit,
     modifier: Modifier = Modifier,
     initialDateIso: String? = null,
     viewModel: DayViewModel = hiltViewModel(),
@@ -150,6 +151,11 @@ fun DayScreen(
         }
         viewModel.goToToday()
     }
+    // Drawer jump-to-date: slide from the side the target lies on.
+    val jumpToDate: (LocalDate) -> Unit = { target ->
+        slideDir = if (target < date) -1 else 1
+        viewModel.goToDate(target)
+    }
 
     ModalNavigationDrawer(
         drawerState = drawerState,
@@ -158,10 +164,15 @@ fun DayScreen(
         drawerContent = {
             CalendarDrawer(
                 currentView = selectedView,
+                currentDate = date,
                 onSelectView = { view ->
                     onSelectView(view)
                     scope.launch { drawerState.close() }
                 },
+                onJumpToDate = { target ->
+                    jumpToDate(target)
+                    scope.launch { drawerState.close() }
+                },
                 onSettings = {
                     onOpenSettings()
                     scope.launch { drawerState.close() }
@@ -185,7 +196,7 @@ fun DayScreen(
                     todayVisible = !isOnToday,
                     todayText = stringResource(R.string.day_today_action),
                     onToday = jumpToToday,
-                    onCreate = { onCreateEvent(date) },
+                    onCreate = { onCreateEvent(date, null) },
                 )
             },
         ) { innerPadding ->
@@ -197,6 +208,7 @@ fun DayScreen(
                 onSwipePrev = goPrev,
                 onRetry = jumpToToday,
                 onEventClick = onEventClick,
+                onCreateAt = { d, minutes -> onCreateEvent(d, minutes) },
                 modifier = Modifier
                     .padding(innerPadding)
                     .fillMaxSize(),
@@ -214,6 +226,7 @@ private fun DayContent(
     onSwipePrev: () -> Unit,
     onRetry: () -> Unit,
     onEventClick: (EventInstance) -> Unit,
+    onCreateAt: (LocalDate, Int) -> Unit,
     modifier: Modifier = Modifier,
 ) {
     val density = LocalDensity.current
@@ -282,6 +295,7 @@ private fun DayContent(
                 scrollState = scrollState,
                 allDayHeight = allDayHeight,
                 onEventClick = onEventClick,
+                onCreateAt = onCreateAt,
             )
         }
     }
@@ -294,6 +308,7 @@ private fun DaySuccess(
     scrollState: ScrollState,
     allDayHeight: Dp,
     onEventClick: (EventInstance) -> Unit,
+    onCreateAt: (LocalDate, Int) -> Unit,
 ) {
     Column(modifier = Modifier.fillMaxSize()) {
         // All-day strip collapses to nothing when the day has no all-day events,
@@ -309,7 +324,12 @@ private fun DaySuccess(
         // Breathing room between the (colour-shifting) top section and the
         // scrolling timeline below.
         Spacer(Modifier.height(8.dp))
-        Timeline(state = state, scrollState = scrollState, onEventClick = onEventClick)
+        Timeline(
+            state = state,
+            scrollState = scrollState,
+            onEventClick = onEventClick,
+            onCreateAt = onCreateAt,
+        )
     }
 }
 
@@ -427,6 +447,7 @@ private fun Timeline(
     state: DayUiState.Success,
     scrollState: ScrollState,
     onEventClick: (EventInstance) -> Unit,
+    onCreateAt: (LocalDate, Int) -> Unit,
 ) {
     val totalHeight = HOUR_HEIGHT * 24
     val dark = isSystemInDarkTheme()
@@ -474,7 +495,9 @@ private fun Timeline(
                 DayColumnCard(
                     blocks = state.timed,
                     dark = dark,
+                    date = state.date,
                     onEventClick = onEventClick,
+                    onCreateAt = onCreateAt,
                     modifier = Modifier
                         .fillMaxWidth()
                         .height(totalHeight),
@@ -488,9 +511,12 @@ private fun Timeline(
 private fun DayColumnCard(
     blocks: List<TimedBlock>,
     dark: Boolean,
+    date: LocalDate,
     onEventClick: (EventInstance) -> Unit,
+    onCreateAt: (LocalDate, Int) -> Unit,
     modifier: Modifier = Modifier,
 ) {
+    val hourPx = with(LocalDensity.current) { HOUR_HEIGHT.toPx() }
     Card(
         // Plain rectangular column — the soft corners come from the outer
         // rounded scroll viewport, so inner rounding would look odd at the edges.
@@ -500,7 +526,19 @@ private fun DayColumnCard(
         ),
         modifier = modifier,
     ) {
-        BoxWithConstraints(modifier = Modifier.fillMaxSize()) {
+        BoxWithConstraints(
+            modifier = Modifier
+                .fillMaxSize()
+                // Tap an empty slot to create an event there. Taps on event
+                // blocks are consumed by their own click handler first, so this
+                // only fires on the column background. Snaps to the tapped hour.
+                .pointerInput(date) {
+                    detectTapGestures { offset ->
+                        val hour = (offset.y / hourPx).toInt().coerceIn(0, 23)
+                        onCreateAt(date, hour * 60)
+                    }
+                },
+        ) {
             val colWidth = maxWidth
             blocks.forEach { block ->
                 val laneWidth = colWidth / block.laneCount

app/src/main/java/de/jeanlucmakiola/calendula/ui/detail/EventDetailScreen.kt

@@ -41,6 +41,7 @@ import androidx.compose.material.icons.filled.Place
 import androidx.compose.material.icons.filled.Public
 import androidx.compose.material.icons.filled.Repeat
 import androidx.compose.material.icons.filled.Schedule
+import androidx.compose.material.icons.filled.Share
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
@@ -59,6 +60,7 @@ import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
@@ -67,7 +69,6 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.platform.LocalContext
 import androidx.core.content.ContextCompat
-import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.AnnotatedString
 import androidx.compose.ui.text.LinkAnnotation
@@ -96,6 +97,8 @@ import de.jeanlucmakiola.calendula.ui.common.OptionCard
 import de.jeanlucmakiola.calendula.ui.common.currentLocale
 import de.jeanlucmakiola.calendula.ui.common.pastelize
 import de.jeanlucmakiola.calendula.ui.common.recurrenceText
+import de.jeanlucmakiola.calendula.ui.common.reminderLeadTimeLabel
+import kotlinx.coroutines.launch
 import kotlinx.datetime.TimeZone
 import java.time.ZoneId
 import java.time.format.DateTimeFormatter
@@ -132,9 +135,30 @@ fun EventDetailScreen(
     BackHandler(onBack = onBack)
 
     val context = LocalContext.current
+    val scope = rememberCoroutineScope()
     val snackbarHostState = remember { SnackbarHostState() }
     var showDeleteDialog by rememberSaveable { mutableStateOf(false) }
 
+    // Sharing is read-only, so it needs no WRITE_CALENDAR upgrade. The VM stages
+    // an .ics in the cache and hands back a content Uri for the chooser.
+    val shareFailedMessage = stringResource(R.string.event_share_failed)
+    val shareChooserTitle = stringResource(R.string.event_share_chooser_title)
+    val onShareClick = {
+        scope.launch {
+            val uri = viewModel.shareUri()
+            val sent = uri != null && runCatching {
+                val send = Intent(Intent.ACTION_SEND).apply {
+                    type = "text/calendar"
+                    putExtra(Intent.EXTRA_STREAM, uri)
+                    addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+                }
+                context.startActivity(Intent.createChooser(send, shareChooserTitle))
+            }.isSuccess
+            if (!sent) snackbarHostState.showSnackbar(shareFailedMessage)
+        }
+        Unit
+    }
+
     // v1.0 installs only hold READ_CALENDAR; the first write asks for the
     // upgrade in place. Granting continues straight into the tapped action.
     var pendingEdit by remember { mutableStateOf(false) }
@@ -203,9 +227,18 @@ fun EventDetailScreen(
                     }
                 },
                 actions = {
-                    // Only writable calendars get actions — WebCal subscriptions,
-                    // birthday calendars etc. are read-only at the provider level.
                     val s = state
+                    // Share works for any loaded event — it only reads the event.
+                    if (s is EventDetailUiState.Success) {
+                        IconButton(onClick = onShareClick) {
+                            Icon(
+                                imageVector = Icons.Default.Share,
+                                contentDescription = stringResource(R.string.event_detail_share),
+                            )
+                        }
+                    }
+                    // Edit/delete need a writable calendar — WebCal subscriptions,
+                    // birthday calendars etc. are read-only at the provider level.
                     if (s is EventDetailUiState.Success && s.canModify) {
                         IconButton(
                             onClick = onEditClick,
@@ -684,26 +717,7 @@ private fun attendeeRoleLabel(attendee: Attendee): Int? = when {
 
 /** Humanise a reminder's lead time, e.g. "10 minutes before" / "At time of event". */
 @Composable
-private fun reminderLeadText(reminder: Reminder): String {
-    val minutes = reminder.minutes
-    return when {
-        minutes < 0 -> stringResource(R.string.reminder_default)
-        minutes == 0 -> stringResource(R.string.reminder_at_time)
-        minutes % 10_080 == 0 -> {
-            val weeks = minutes / 10_080
-            pluralStringResource(R.plurals.reminder_weeks, weeks, weeks)
-        }
-        minutes % 1_440 == 0 -> {
-            val days = minutes / 1_440
-            pluralStringResource(R.plurals.reminder_days, days, days)
-        }
-        minutes % 60 == 0 -> {
-            val hours = minutes / 60
-            pluralStringResource(R.plurals.reminder_hours, hours, hours)
-        }
-        else -> pluralStringResource(R.plurals.reminder_minutes, minutes, minutes)
-    }
-}
+private fun reminderLeadText(reminder: Reminder): String = reminderLeadTimeLabel(reminder.minutes)
 
 /**
  * A localized label for [tz] (e.g. "Central European Time (Europe/Berlin)"),
@@ -762,14 +776,19 @@ private fun formatWhen(
     val allDayLabel = stringResource(R.string.event_detail_all_day)
 
     if (instance.isAllDay) {
-        // All-day end is the exclusive next midnight; step back to the last
-        // covered day so a one-day event reads as a single date.
-        val lastLdt = (instance.end - 1.seconds).toJavaLocalDateTime(zid)
-        return if (startLdt.toLocalDate() == lastLdt.toLocalDate()) {
-            allDayLabel to dateFull.format(startLdt.toLocalDate())
+        // All-day events live at UTC midnights with an exclusive end. Resolve
+        // the covered dates in UTC — not the device zone, which would shift the
+        // midnight boundaries off the intended date (east of UTC pushes the
+        // end past the last day; west of UTC pulls the start back) — and step
+        // the end back to the last covered day so a one-day event reads as a
+        // single date.
+        val utc = ZoneId.of("UTC")
+        val startDate = instance.start.toJavaLocalDateTime(utc).toLocalDate()
+        val lastDate = (instance.end - 1.seconds).toJavaLocalDateTime(utc).toLocalDate()
+        return if (startDate == lastDate) {
+            allDayLabel to dateFull.format(startDate)
         } else {
-            allDayLabel to
-                "${dateMedium.format(startLdt.toLocalDate())} – ${dateMedium.format(lastLdt.toLocalDate())}"
+            allDayLabel to "${dateMedium.format(startDate)} – ${dateMedium.format(lastDate)}"
         }
     }
 

app/src/main/java/de/jeanlucmakiola/calendula/ui/detail/EventDetailViewModel.kt

@@ -1,14 +1,20 @@
 package de.jeanlucmakiola.calendula.ui.detail
 
+import android.net.Uri
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
 import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
 import de.jeanlucmakiola.calendula.data.calendar.NoSuchEventException
 import de.jeanlucmakiola.calendula.data.di.IoDispatcher
+import de.jeanlucmakiola.calendula.data.ics.IcsExporter
 import de.jeanlucmakiola.calendula.domain.FailureReason
 import de.jeanlucmakiola.calendula.domain.RecurringWriteScope
+import de.jeanlucmakiola.calendula.domain.ics.IcsWriter
+import de.jeanlucmakiola.calendula.domain.ics.toShareIcsEvent
 import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.withContext
+import kotlin.time.Clock
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
@@ -34,6 +40,7 @@ import javax.inject.Inject
 @HiltViewModel
 class EventDetailViewModel @Inject constructor(
     private val repository: CalendarRepository,
+    private val icsExporter: IcsExporter,
     @IoDispatcher private val io: CoroutineDispatcher,
 ) : ViewModel() {
 
@@ -113,6 +120,24 @@ class EventDetailViewModel @Inject constructor(
         _deleteState.value = DeleteUiState.Idle
     }
 
+    /**
+     * Serialise the open event to a `.ics` cache file and return a shareable
+     * content Uri (for an ACTION_SEND), or null when nothing is loaded or the
+     * write fails. The event is exported as a one-off (see [toShareIcsEvent]).
+     */
+    suspend fun shareUri(): Uri? {
+        val detail = (state.value as? EventDetailUiState.Success)?.detail ?: return null
+        return runCatching {
+            withContext(io) {
+                val ics = IcsWriter().writeCalendar(
+                    events = listOf(detail.toShareIcsEvent()),
+                    dtStamp = Clock.System.now(),
+                )
+                icsExporter.stageShareFile(shareFileName(detail.instance.title), ics)
+            }
+        }.getOrNull()
+    }
+
     private suspend fun loadDetail(target: Target): EventDetailUiState = try {
         val detail = repository.eventDetail(target.eventId)
         // The Events row holds the series start; replace it with this
@@ -143,3 +168,13 @@ class EventDetailViewModel @Inject constructor(
     /** A tapped occurrence: the series [eventId] plus this occurrence's own times. */
     private data class Target(val eventId: Long, val beginMillis: Long, val endMillis: Long)
 }
+
+/** A filesystem-safe `.ics` file name from an event title (or a fallback). */
+private fun shareFileName(title: String): String {
+    val base = title.trim()
+        .replace(Regex("""[^\p{L}\p{Nd} _-]"""), "")
+        .replace(' ', '_')
+        .take(40)
+        .ifBlank { "event" }
+    return "$base.ics"
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/edit/EventEditScreen.kt

@@ -41,6 +41,7 @@ import androidx.compose.material.icons.filled.Close
 import androidx.compose.material.icons.filled.EventAvailable
 import androidx.compose.material.icons.filled.Lock
 import androidx.compose.material.icons.filled.Notifications
+import androidx.compose.material.icons.filled.Palette
 import androidx.compose.material.icons.filled.Place
 import androidx.compose.material.icons.filled.Public
 import androidx.compose.material.icons.filled.Repeat
@@ -50,8 +51,6 @@ import androidx.compose.material.icons.filled.VisibilityOff
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.AssistChip
 import androidx.compose.material3.Button
-import androidx.compose.material3.DatePicker
-import androidx.compose.material3.DatePickerDialog
 import androidx.compose.material3.DropdownMenu
 import androidx.compose.material3.DropdownMenuItem
 import androidx.compose.material3.ExperimentalMaterial3Api
@@ -69,11 +68,8 @@ import androidx.compose.material3.Surface
 import androidx.compose.material3.Switch
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
-import androidx.compose.material3.TimePicker
 import androidx.compose.material3.TopAppBar
 import androidx.compose.material3.TopAppBarDefaults
-import androidx.compose.material3.rememberDatePickerState
-import androidx.compose.material3.rememberTimePickerState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
@@ -88,7 +84,6 @@ import androidx.compose.ui.graphics.SolidColor
 import androidx.compose.ui.graphics.isSpecified
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.AnnotatedString
 import androidx.compose.ui.text.TextStyle
@@ -102,6 +97,8 @@ import de.jeanlucmakiola.calendula.R
 import de.jeanlucmakiola.calendula.domain.AccessLevel
 import de.jeanlucmakiola.calendula.domain.Availability
 import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.EventColorOption
+import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventFormField
 import de.jeanlucmakiola.calendula.domain.EventFormProblem
 import de.jeanlucmakiola.calendula.domain.RecurrenceEnd
@@ -110,8 +107,20 @@ import de.jeanlucmakiola.calendula.domain.RecurringWriteScope
 import de.jeanlucmakiola.calendula.domain.SimpleRecurrence
 import de.jeanlucmakiola.calendula.domain.parseSimpleRecurrence
 import de.jeanlucmakiola.calendula.domain.toRRule
+import de.jeanlucmakiola.calendula.ui.common.CALENDAR_COLOR_PALETTE
+import de.jeanlucmakiola.calendula.ui.common.CalendarDatePickerDialog
+import de.jeanlucmakiola.calendula.ui.common.ColorSwatchRow
+import de.jeanlucmakiola.calendula.ui.common.DialogAmountField
+import de.jeanlucmakiola.calendula.ui.common.DialogUnitDropdown
+import de.jeanlucmakiola.calendula.ui.common.MILLIS_PER_DAY
+import de.jeanlucmakiola.calendula.ui.common.InlineTextField
 import de.jeanlucmakiola.calendula.ui.common.OptionCard
+import de.jeanlucmakiola.calendula.ui.common.REMINDER_PRESETS
+import de.jeanlucmakiola.calendula.ui.common.ReminderUnit
+import de.jeanlucmakiola.calendula.ui.common.TimePickerAlert
 import de.jeanlucmakiola.calendula.ui.common.currentLocale
+import de.jeanlucmakiola.calendula.ui.common.reminderLeadTimeLabel
+import de.jeanlucmakiola.calendula.ui.common.reminderUnitLabel
 import de.jeanlucmakiola.calendula.ui.common.pastelize
 import de.jeanlucmakiola.calendula.ui.common.recurrenceText
 import kotlinx.datetime.DayOfWeek
@@ -147,19 +156,24 @@ fun EventEditScreen(
     onClose: () -> Unit,
     onSaved: () -> Unit,
     editKey: LongArray? = null,
+    initialStartMinutes: Int? = null,
+    initialForm: EventForm? = null,
     viewModel: EventEditViewModel = hiltViewModel(),
 ) {
-    LaunchedEffect(initialDateIso, editKey) {
-        if (editKey != null) {
-            viewModel.openForEdit(
+    LaunchedEffect(initialDateIso, editKey, initialForm) {
+        when {
+            // Single-event .ics open: the form arrives prefilled for review.
+            initialForm != null -> viewModel.openImported(initialForm)
+            editKey != null -> viewModel.openForEdit(
                 eventId = editKey[0],
                 beginMillis = editKey[1],
                 endMillis = editKey[2],
             )
-        } else {
+            else -> {
                 val date = initialDateIso?.let { runCatching { LocalDate.parse(it) }.getOrNull() }
                     ?: Clock.System.now().toLocalDateTime(TimeZone.currentSystemDefault()).date
-            viewModel.openNew(date)
+                viewModel.openNew(date, initialStartMinutes)
+            }
         }
     }
     val state by viewModel.state.collectAsStateWithLifecycle()
@@ -412,6 +426,7 @@ private fun EventEditContent(
     var showReminderPicker by rememberSaveable { mutableStateOf(false) }
     var showRecurrencePicker by rememberSaveable { mutableStateOf(false) }
     var showVisibilityPicker by rememberSaveable { mutableStateOf(false) }
+    var showColorPicker by rememberSaveable { mutableStateOf(false) }
     var showFieldPicker by rememberSaveable { mutableStateOf(false) }
 
     val selectedCalendar = state.calendars.firstOrNull { it.id == form.calendarId }
@@ -421,6 +436,16 @@ private fun EventEditContent(
         ?: MaterialTheme.colorScheme.primary
     val gap = 12.dp
 
+    // Per-event colour applicability for the resolved calendar:
+    //  - palette calendars (Google, …) and local calendars always support it;
+    //  - synced calendars with no palette only when the user opted in, and even
+    //    then the colour may not survive the calendar's next sync (the warning).
+    val isLocalCalendar = selectedCalendar?.isLocal == true
+    val colorSupported = state.colorPalette.isNotEmpty() || isLocalCalendar ||
+        state.allowColorOnUnsupportedCalendars
+    val colorSyncRisk = state.colorPalette.isEmpty() && !isLocalCalendar &&
+        state.allowColorOnUnsupportedCalendars
+
     Column(
         modifier = modifier
             // Shrink the scroll viewport by the keyboard instead of letting
@@ -690,6 +715,67 @@ private fun EventEditContent(
             }
         }
 
+        OptionalFormSection(visible = EventFormField.Color in state.visibleFields) {
+            Spacer(Modifier.height(gap))
+            // The swatch the event will paint with: its own colour, else the
+            // calendar's. The Palette icon takes that colour as a preview.
+            val swatch = form.color ?: selectedCalendar?.color
+            EditCard(
+                icon = Icons.Default.Palette,
+                iconContentDescription = stringResource(R.string.event_edit_color),
+                iconTint = if (colorSupported && swatch != null) {
+                    pastelize(swatch, dark)
+                } else {
+                    MaterialTheme.colorScheme.onSurfaceVariant
+                },
+                onClick = { showColorPicker = true }.takeIf { colorSupported },
+            ) {
+                Row(
+                    verticalAlignment = Alignment.CenterVertically,
+                    modifier = Modifier.fillMaxWidth(),
+                ) {
+                    Column(modifier = Modifier.weight(1f)) {
+                        Text(
+                            text = stringResource(
+                                when {
+                                    !colorSupported -> R.string.event_edit_color_unsupported
+                                    form.color != null -> R.string.event_edit_color_custom
+                                    else -> R.string.event_edit_color_default
+                                },
+                            ),
+                            style = MaterialTheme.typography.titleMedium,
+                        )
+                        Text(
+                            text = stringResource(
+                                if (colorSupported) {
+                                    R.string.event_edit_color
+                                } else {
+                                    R.string.event_edit_color_unsupported_hint
+                                },
+                            ),
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        )
+                        if (colorSyncRisk) {
+                            Spacer(Modifier.height(2.dp))
+                            Text(
+                                text = stringResource(R.string.event_edit_color_sync_warning),
+                                style = MaterialTheme.typography.bodySmall,
+                                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                            )
+                        }
+                    }
+                    if (colorSupported) {
+                        Icon(
+                            imageVector = Icons.Default.ArrowDropDown,
+                            contentDescription = null,
+                            tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                        )
+                    }
+                }
+            }
+        }
+
         OptionalFormSection(visible = state.hiddenFields.isNotEmpty()) {
             Spacer(Modifier.height(20.dp))
             TextButton(
@@ -708,12 +794,12 @@ private fun EventEditContent(
     }
 
     when (picker) {
-        PickerTarget.StartDate -> DatePickerAlert(
+        PickerTarget.StartDate -> CalendarDatePickerDialog(
             initial = form.start.date,
             onConfirm = { viewModel.setStartDate(it); picker = null },
             onDismiss = { picker = null },
         )
-        PickerTarget.EndDate -> DatePickerAlert(
+        PickerTarget.EndDate -> CalendarDatePickerDialog(
             initial = form.end.date,
             onConfirm = { viewModel.setEndDate(it); picker = null },
             onDismiss = { picker = null },
@@ -777,6 +863,28 @@ private fun EventEditContent(
         )
     }
 
+    if (showColorPicker) {
+        ColorPickerDialog(
+            palette = state.colorPalette,
+            selected = form.color,
+            hasExplicitColor = form.color != null,
+            syncWarning = colorSyncRisk,
+            onPickKey = { key, argb ->
+                viewModel.setColorKey(key, argb)
+                showColorPicker = false
+            },
+            onPickRaw = { argb ->
+                viewModel.setColorRaw(argb)
+                showColorPicker = false
+            },
+            onClear = {
+                viewModel.clearColor()
+                showColorPicker = false
+            },
+            onDismiss = { showColorPicker = false },
+        )
+    }
+
     if (showFieldPicker) {
         FieldPickerDialog(
             hiddenFields = state.hiddenFields,
@@ -817,14 +925,7 @@ private fun FieldPickerDialog(
 }
 
 /** Quick-pick lead times offered as chips in the reminder dialog. */
-private val REMINDER_QUICK_PICKS = listOf(0, 10, 30, 60, 1_440)
-
-private enum class ReminderUnit(val minutesFactor: Int) {
-    Minutes(1),
-    Hours(60),
-    Days(1_440),
-    Weeks(10_080),
-}
+private val REMINDER_QUICK_PICKS = REMINDER_PRESETS
 
 /**
  * Reminder picker, two steps: the common lead times as a tappable list
@@ -1078,7 +1179,7 @@ private fun RecurrencePickerDialog(
     )
 
     if (showUntilPicker) {
-        DatePickerAlert(
+        CalendarDatePickerDialog(
             initial = untilDate ?: LocalDate.fromEpochDays(
                 (Clock.System.now().toEpochMilliseconds() / MILLIS_PER_DAY).toInt(),
             ),
@@ -1146,84 +1247,6 @@ private fun Set<DayOfWeek>.toMask(): Int = fold(0) { acc, day -> acc or day.toMa
 private fun Int.toDaySet(): Set<DayOfWeek> =
     DayOfWeek.entries.filter { this and it.toMaskBit() != 0 }.toSet()
 
-/** Tonal 3-digit number input shared by the custom reminder/recurrence steps. */
-@Composable
-private fun DialogAmountField(
-    value: String,
-    onValueChange: (String) -> Unit,
-    placeholder: String,
-) {
-    // surfaceContainerHighest — the dialog itself sits on
-    // surfaceContainerHigh, so anything lower vanishes.
-    Surface(
-        color = MaterialTheme.colorScheme.surfaceContainerHighest,
-        shape = RoundedCornerShape(12.dp),
-    ) {
-        InlineField(
-            value = value,
-            onValueChange = { text ->
-                if (text.length <= 3 && text.all(Char::isDigit)) {
-                    onValueChange(text)
-                }
-            },
-            placeholder = placeholder,
-            textStyle = MaterialTheme.typography.titleMedium,
-            keyboardType = KeyboardType.Number,
-            modifier = Modifier
-                .width(72.dp)
-                .padding(horizontal = 14.dp, vertical = 12.dp),
-        )
-    }
-}
-
-/** Tonal dropdown trigger + menu shared by the custom reminder/recurrence steps. */
-@Composable
-private fun DialogUnitDropdown(
-    label: String,
-    entries: List<String>,
-    onPick: (Int) -> Unit,
-) {
-    var open by remember { mutableStateOf(false) }
-    Box {
-        Surface(
-            color = MaterialTheme.colorScheme.surfaceContainerHighest,
-            shape = RoundedCornerShape(12.dp),
-            onClick = { open = true },
-        ) {
-            Row(
-                verticalAlignment = Alignment.CenterVertically,
-                modifier = Modifier.padding(
-                    start = 14.dp,
-                    end = 8.dp,
-                    top = 12.dp,
-                    bottom = 12.dp,
-                ),
-            ) {
-                Text(
-                    text = label,
-                    style = MaterialTheme.typography.titleMedium,
-                )
-                Spacer(Modifier.width(4.dp))
-                Icon(
-                    imageVector = Icons.Default.ArrowDropDown,
-                    contentDescription = null,
-                    tint = MaterialTheme.colorScheme.onSurfaceVariant,
-                )
-            }
-        }
-        DropdownMenu(expanded = open, onDismissRequest = { open = false }) {
-            entries.forEachIndexed { index, entry ->
-                DropdownMenuItem(
-                    text = { Text(entry) },
-                    onClick = {
-                        onPick(index)
-                        open = false
-                    },
-                )
-            }
-        }
-    }
-}
 
 private fun recurrencePresetLabel(freq: RecurrenceFreq): Int = when (freq) {
     RecurrenceFreq.Daily -> R.string.recurrence_daily
@@ -1278,13 +1301,6 @@ private fun AddReminderChip(onClick: () -> Unit) {
     )
 }
 
-private fun reminderUnitLabel(unit: ReminderUnit): Int = when (unit) {
-    ReminderUnit.Minutes -> R.string.reminder_unit_minutes
-    ReminderUnit.Hours -> R.string.reminder_unit_hours
-    ReminderUnit.Days -> R.string.reminder_unit_days
-    ReminderUnit.Weeks -> R.string.reminder_unit_weeks
-}
-
 private fun fieldLabel(field: EventFormField): Int = when (field) {
     EventFormField.Location -> R.string.event_detail_location
     EventFormField.Description -> R.string.event_detail_description
@@ -1292,6 +1308,7 @@ private fun fieldLabel(field: EventFormField): Int = when (field) {
     EventFormField.Recurrence -> R.string.event_detail_recurrence
     EventFormField.Availability -> R.string.event_edit_availability
     EventFormField.Visibility -> R.string.event_edit_visibility
+    EventFormField.Color -> R.string.event_edit_color
 }
 
 private fun fieldIcon(field: EventFormField): ImageVector = when (field) {
@@ -1301,6 +1318,7 @@ private fun fieldIcon(field: EventFormField): ImageVector = when (field) {
     EventFormField.Recurrence -> Icons.Default.Repeat
     EventFormField.Availability -> Icons.Default.EventAvailable
     EventFormField.Visibility -> Icons.Default.Lock
+    EventFormField.Color -> Icons.Default.Palette
 }
 
 /**
@@ -1334,6 +1352,72 @@ private fun VisibilityPickerDialog(
     )
 }
 
+/**
+ * Event-colour picker: just the swatches. A non-empty [palette] (the calendar
+ * account's published colours) picks by key so the colour round-trips through
+ * sync; otherwise the app's own palette writes a raw colour, with a
+ * [syncWarning] when that calendar may not keep it. The "Reset" button (shown
+ * only once a colour is set) drops back to the calendar's own colour.
+ */
+@Composable
+private fun ColorPickerDialog(
+    palette: List<EventColorOption>,
+    selected: Int?,
+    hasExplicitColor: Boolean,
+    syncWarning: Boolean,
+    onPickKey: (String, Int) -> Unit,
+    onPickRaw: (Int) -> Unit,
+    onClear: () -> Unit,
+    onDismiss: () -> Unit,
+) {
+    val dark = isSystemInDarkTheme()
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text(stringResource(R.string.event_edit_color)) },
+        text = {
+            Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
+                if (palette.isNotEmpty()) {
+                    ColorSwatchRow(
+                        colors = palette.map { it.argb },
+                        selected = selected,
+                        onSelect = { argb ->
+                            palette.firstOrNull { it.argb == argb }
+                                ?.let { onPickKey(it.key, it.argb) }
+                        },
+                        dark = dark,
+                    )
+                } else {
+                    ColorSwatchRow(
+                        colors = CALENDAR_COLOR_PALETTE,
+                        selected = selected,
+                        onSelect = onPickRaw,
+                        dark = dark,
+                    )
+                    if (syncWarning) {
+                        Text(
+                            text = stringResource(R.string.event_edit_color_sync_warning),
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        )
+                    }
+                }
+            }
+        },
+        confirmButton = {
+            TextButton(onClick = onDismiss) { Text(stringResource(R.string.dialog_cancel)) }
+        },
+        dismissButton = if (hasExplicitColor) {
+            {
+                TextButton(onClick = onClear) {
+                    Text(stringResource(R.string.event_edit_color_reset))
+                }
+            }
+        } else {
+            null
+        },
+    )
+}
+
 private fun accessLevelIcon(level: AccessLevel): ImageVector = when (level) {
     AccessLevel.Default -> Icons.Default.Tune
     AccessLevel.Public -> Icons.Default.Public
@@ -1350,16 +1434,7 @@ private fun accessLevelLabel(level: AccessLevel): Int = when (level) {
 
 /** Humanise a reminder lead time, mirroring the detail screen's rendering. */
 @Composable
-private fun reminderLabel(minutes: Int): String = when {
-    minutes <= 0 -> stringResource(R.string.reminder_at_time)
-    minutes % 10_080 == 0 ->
-        pluralStringResource(R.plurals.reminder_weeks, minutes / 10_080, minutes / 10_080)
-    minutes % 1_440 == 0 ->
-        pluralStringResource(R.plurals.reminder_days, minutes / 1_440, minutes / 1_440)
-    minutes % 60 == 0 ->
-        pluralStringResource(R.plurals.reminder_hours, minutes / 60, minutes / 60)
-    else -> pluralStringResource(R.plurals.reminder_minutes, minutes, minutes)
-}
+private fun reminderLabel(minutes: Int): String = reminderLeadTimeLabel(minutes)
 
 /**
  * One info card mirroring the detail screen's DetailCard: tonal container,
@@ -1436,8 +1511,9 @@ private fun EditCard(
 }
 
 /**
- * Borderless text input used inside the cards (and as the headline title) —
- * no underline, no outline, just the card's tonal surface behind it.
+ * Borderless text input used inside the cards (and as the headline title).
+ * Thin wrapper over the shared [InlineTextField] so the form and the rest of
+ * the app share one input style.
  */
 @Composable
 private fun InlineField(
@@ -1452,36 +1528,15 @@ private fun InlineField(
         .fillMaxWidth()
         .padding(vertical = 4.dp),
 ) {
-    val resolvedStyle = textStyle.copy(
-        color = if (textStyle.color.isSpecified) {
-            textStyle.color
-        } else {
-            MaterialTheme.colorScheme.onSurface
-        },
-    )
-    BasicTextField(
+    InlineTextField(
         value = value,
         onValueChange = onValueChange,
-        textStyle = resolvedStyle,
+        placeholder = placeholder,
+        modifier = modifier,
+        textStyle = textStyle,
         singleLine = singleLine,
         minLines = minLines,
-        keyboardOptions = KeyboardOptions(keyboardType = keyboardType),
-        cursorBrush = SolidColor(MaterialTheme.colorScheme.primary),
-        decorationBox = { innerTextField ->
-            Box {
-                if (value.isEmpty()) {
-                    // Clearly fainter than typed text, so a hint (e.g. the
-                    // "10" in the reminder amount) never reads as prefilled.
-                    Text(
-                        text = placeholder,
-                        style = resolvedStyle,
-                        color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f),
-                    )
-                }
-                innerTextField()
-            }
-        },
-        modifier = modifier,
+        keyboardType = keyboardType,
     )
 }
 
@@ -1540,62 +1595,6 @@ private fun ScheduleRow(
     }
 }
 
-@OptIn(ExperimentalMaterial3Api::class)
-@Composable
-private fun DatePickerAlert(
-    initial: LocalDate,
-    onConfirm: (LocalDate) -> Unit,
-    onDismiss: () -> Unit,
-) {
-    // DatePicker speaks UTC-midnight millis; epoch-day arithmetic keeps the
-    // conversion zone-proof in both directions.
-    val state = rememberDatePickerState(
-        initialSelectedDateMillis = initial.toEpochDays() * MILLIS_PER_DAY,
-    )
-    DatePickerDialog(
-        onDismissRequest = onDismiss,
-        confirmButton = {
-            TextButton(
-                onClick = {
-                    state.selectedDateMillis?.let { millis ->
-                        onConfirm(LocalDate.fromEpochDays((millis / MILLIS_PER_DAY).toInt()))
-                    }
-                },
-            ) { Text(stringResource(R.string.dialog_ok)) }
-        },
-        dismissButton = {
-            TextButton(onClick = onDismiss) { Text(stringResource(R.string.dialog_cancel)) }
-        },
-    ) {
-        DatePicker(state = state)
-    }
-}
-
-@OptIn(ExperimentalMaterial3Api::class)
-@Composable
-private fun TimePickerAlert(
-    initial: LocalTime,
-    onConfirm: (LocalTime) -> Unit,
-    onDismiss: () -> Unit,
-) {
-    val state = rememberTimePickerState(
-        initialHour = initial.hour,
-        initialMinute = initial.minute,
-    )
-    AlertDialog(
-        onDismissRequest = onDismiss,
-        confirmButton = {
-            TextButton(onClick = { onConfirm(LocalTime(state.hour, state.minute)) }) {
-                Text(stringResource(R.string.dialog_ok))
-            }
-        },
-        dismissButton = {
-            TextButton(onClick = onDismiss) { Text(stringResource(R.string.dialog_cancel)) }
-        },
-        text = { TimePicker(state = state) },
-    )
-}
-
 @Composable
 private fun CalendarPickerDialog(
     calendars: List<CalendarSource>,
@@ -1627,5 +1626,3 @@ private fun CalendarPickerDialog(
         },
     )
 }
-
-private const val MILLIS_PER_DAY = 86_400_000L

app/src/main/java/de/jeanlucmakiola/calendula/ui/edit/EventEditUiState.kt

@@ -1,6 +1,7 @@
 package de.jeanlucmakiola.calendula.ui.edit
 
 import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.EventColorOption
 import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventFormField
 import de.jeanlucmakiola.calendula.domain.EventFormProblem
@@ -33,6 +34,18 @@ data class EventEditUiState(
      * then drops "only this event" (an exception row can't carry a rule).
      */
     val recurrenceChanged: Boolean = false,
+    /**
+     * The event-colour palette the resolved target calendar publishes; empty
+     * when it exposes none. Non-empty → the colour picker offers these swatches
+     * (written as a key, sync-safe); empty → see [colorMode].
+     */
+    val colorPalette: List<EventColorOption> = emptyList(),
+    /**
+     * Whether the user has opted into custom colours on calendars that publish
+     * no palette (a synced one may then drop the colour on sync). Mirrors the
+     * settings flag; ignored for local and palette-backed calendars.
+     */
+    val allowColorOnUnsupportedCalendars: Boolean = false,
 )
 
 /** One-shot state of a save request, mirroring DeleteUiState on the detail screen. */

app/src/main/java/de/jeanlucmakiola/calendula/ui/edit/EventEditViewModel.kt

@@ -8,10 +8,12 @@ import de.jeanlucmakiola.calendula.data.calendar.NoSuchEventException
 import de.jeanlucmakiola.calendula.data.di.IoDispatcher
 import de.jeanlucmakiola.calendula.data.prefs.CalendarPrefs
 import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
+import de.jeanlucmakiola.calendula.data.prefs.resolveDefaultReminder
 import de.jeanlucmakiola.calendula.domain.AccessLevel
 import de.jeanlucmakiola.calendula.domain.Availability
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EditSnapshot
+import de.jeanlucmakiola.calendula.domain.EventColorOption
 import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventFormField
 import de.jeanlucmakiola.calendula.domain.RecurringWriteScope
@@ -19,12 +21,18 @@ import de.jeanlucmakiola.calendula.domain.populatedFields
 import de.jeanlucmakiola.calendula.domain.problems
 import de.jeanlucmakiola.calendula.domain.toEditSnapshot
 import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.catch
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.flatMapLatest
+import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
@@ -65,6 +73,10 @@ class EventEditViewModel @Inject constructor(
     // Set while the form edits an existing event instead of composing a new one.
     private val _editTarget = MutableStateFlow<EditTarget?>(null)
     private val _loadFailed = MutableStateFlow(false)
+    // True once the user has hand-edited the reminders on a new event, which
+    // freezes the auto-applied default: switching calendars no longer overwrites
+    // their choice. Reset with the form.
+    private val _remindersTouched = MutableStateFlow(false)
 
     /** True when the event to edit couldn't be loaded; the screen closes itself. */
     val loadFailed: StateFlow<Boolean> = _loadFailed.asStateFlow()
@@ -94,23 +106,55 @@ class EventEditViewModel @Inject constructor(
         val editTarget: EditTarget?,
     )
 
+    private data class ReminderDefaults(
+        val timed: Int?,
+        val allDay: Int?,
+        val timedOverrides: Map<Long, Int?>,
+        val allDayOverrides: Map<Long, Int?>,
+    )
+
     private data class ExternalInputs(
         val writable: List<CalendarSource>,
         val lastUsed: Long?,
         val defaultFields: Set<EventFormField>,
+        val allowColorOnUnsupported: Boolean,
     )
 
+    /** Writable calendars — the only valid event targets. */
+    private val writableCalendars: Flow<List<CalendarSource>> = repository.calendars()
+        .map { calendars -> calendars.filter { it.canModifyContents } }
+        .catch { emit(emptyList()) }
+
+    /** The target calendar id, resolved exactly as the form shows it. */
+    private val resolvedCalendarId: Flow<Long?> = combine(
+        _form.map { it?.calendarId },
+        writableCalendars,
+        prefs.lastUsedCalendarId,
+    ) { picked, writable, lastUsed ->
+        picked
+            ?: lastUsed?.takeIf { id -> writable.any { it.id == id } }
+            ?: writable.firstOrNull()?.id
+    }.distinctUntilChanged()
+
+    /** The resolved calendar's published event palette, refetched when it changes. */
+    @OptIn(ExperimentalCoroutinesApi::class)
+    private val colorPalette: Flow<List<EventColorOption>> = resolvedCalendarId
+        .flatMapLatest { id ->
+            flow { emit(id?.let { repository.eventColorPalette(it) }.orEmpty()) }
+        }
+        .flowOn(io)
+
     val state: StateFlow<EventEditUiState?> = combine(
         combine(_form, _saveState, _showProblems, _revealed, _editTarget, ::LocalInputs),
         combine(
-            repository.calendars()
-                .map { calendars -> calendars.filter { it.canModifyContents } }
-                .catch { emit(emptyList()) },
+            writableCalendars,
             prefs.lastUsedCalendarId,
             settingsPrefs.defaultFormFields,
+            settingsPrefs.allowColorOnUnsupportedCalendars,
             ::ExternalInputs,
         ).flowOn(io),
-    ) { local, external ->
+        colorPalette,
+    ) { local, external, palette ->
         val form = local.form ?: return@combine null
         val resolvedId = form.calendarId
             ?: external.lastUsed?.takeIf { id -> external.writable.any { it.id == id } }
@@ -129,6 +173,8 @@ class EventEditViewModel @Inject constructor(
             // the scope dialog drops "only this event" after a rule change.
             recurrenceChanged = local.editTarget != null &&
                 resolved.rrule != local.editTarget.original.rrule,
+            colorPalette = palette,
+            allowColorOnUnsupportedCalendars = external.allowColorOnUnsupported,
         )
     }
         .stateIn(
@@ -138,24 +184,86 @@ class EventEditViewModel @Inject constructor(
         )
 
     /**
-     * Initialise a fresh form for a new event on [date]. No-op when a form is
-     * already open, so user input survives configuration changes; [reset]
-     * clears it when the screen closes.
+     * Initialise a fresh form for a new event on [date]. [startMinutes] (minutes
+     * from midnight) anchors the start when the form is opened by tapping a slot
+     * in the day/week grid; without it the default is the next full hour (today)
+     * or 09:00 (any other day). No-op when a form is already open, so user input
+     * survives configuration changes; [reset] clears it when the screen closes.
      */
-    fun openNew(date: LocalDate) {
+    fun openNew(date: LocalDate, startMinutes: Int? = null) {
         if (_form.value != null) return
         val zone = TimeZone.currentSystemDefault()
         val now = Clock.System.now()
-        val start = if (date == now.toLocalDateTime(zone).date) {
+        val start = when {
+            startMinutes != null ->
+                LocalDateTime(date, LocalTime(startMinutes / 60, startMinutes % 60))
+            date == now.toLocalDateTime(zone).date -> {
                 // Today: the next full hour (may roll into tomorrow before midnight).
                 val hourMillis = 3_600_000L
                 val rounded = (now.toEpochMilliseconds() / hourMillis + 1) * hourMillis
                 Instant.fromEpochMilliseconds(rounded).toLocalDateTime(zone)
-        } else {
-            LocalDateTime(date, LocalTime(9, 0))
+            }
+            else -> LocalDateTime(date, LocalTime(9, 0))
         }
         val end = (start.toInstant(zone) + 1.hours).toLocalDateTime(zone)
         _form.value = EventForm(calendarId = null, start = start, end = end)
+        applyDefaultReminder()
+    }
+
+    /**
+     * Seed a fresh event from a parsed `.ics` file (the single-event "open into
+     * the create form" path). [form] already carries the file's fields; its
+     * [EventForm.calendarId] is null so the calendar still resolves to the
+     * last-used/first-writable one, and reminders are frozen as touched so the
+     * settings default never overwrites what the file specified. No-op when a
+     * form is already open, so the prefill survives configuration changes.
+     */
+    fun openImported(form: EventForm) {
+        if (_form.value != null || _editTarget.value != null) return
+        _remindersTouched.value = true
+        _revealed.value = form.populatedFields()
+        _form.value = form
+    }
+
+    /**
+     * Prefill a new event's reminders from the settings default — the all-day
+     * default for all-day events, otherwise the resolved calendar's per-calendar
+     * override or the global timed default. No-op while editing an existing event
+     * or once the user has hand-edited the reminders, so the auto-default never
+     * clobbers a manual choice. [calendarId] short-circuits the resolution after a
+     * calendar switch; null resolves it as the form does.
+     */
+    private fun applyDefaultReminder(calendarId: Long? = null) {
+        if (_editTarget.value != null || _remindersTouched.value) return
+        viewModelScope.launch {
+            val defaults = combine(
+                settingsPrefs.defaultReminderMinutes,
+                settingsPrefs.defaultAllDayReminderMinutes,
+                settingsPrefs.perCalendarReminderOverride,
+                settingsPrefs.perCalendarAllDayReminderOverride,
+            ) { timed, allDay, timedOv, allDayOv ->
+                ReminderDefaults(timed, allDay, timedOv, allDayOv)
+            }.first()
+            val targetId = calendarId ?: resolvedCalendarId.first()
+            // Re-check after suspending: bail if the form closed or the user edited.
+            val form = _form.value ?: return@launch
+            if (_editTarget.value != null || _remindersTouched.value) return@launch
+            val default = resolveDefaultReminder(
+                timedGlobal = defaults.timed,
+                allDayGlobal = defaults.allDay,
+                timedOverrides = defaults.timedOverrides,
+                allDayOverrides = defaults.allDayOverrides,
+                calendarId = targetId,
+                isAllDay = form.isAllDay,
+            )
+            val reminders = listOfNotNull(default)
+            _form.value = form.copy(reminders = reminders)
+            // Surface the section so an auto-applied default is visible and
+            // removable, even when Reminders isn't a default-shown field.
+            if (reminders.isNotEmpty()) {
+                _revealed.value = _revealed.value + EventFormField.Reminders
+            }
+        }
     }
 
     /**
@@ -191,6 +299,7 @@ class EventEditViewModel @Inject constructor(
         _revealed.value = emptySet()
         _editTarget.value = null
         _loadFailed.value = false
+        _remindersTouched.value = false
     }
 
     /** Unfold one optional field, picked in the "more fields" dialog. */
@@ -201,20 +310,47 @@ class EventEditViewModel @Inject constructor(
     fun setTitle(value: String) = update { it.copy(title = value) }
     fun setLocation(value: String) = update { it.copy(location = value) }
     fun setDescription(value: String) = update { it.copy(description = value) }
-    fun setAllDay(value: Boolean) = update { it.copy(isAllDay = value) }
-    fun setCalendar(id: Long) = update { it.copy(calendarId = id) }
+    fun setAllDay(value: Boolean) {
+        update { it.copy(isAllDay = value) }
+        // The default reminder differs for all-day vs timed; re-apply the
+        // type-appropriate default unless the user has hand-edited it (guarded).
+        applyDefaultReminder()
+    }
+
+    /**
+     * Switching calendars drops any chosen colour: a palette key is
+     * account-scoped, and a raw colour may be invalid on the new calendar.
+     * The event falls back to the new calendar's colour until re-picked.
+     */
+    fun setCalendar(id: Long) {
+        update { it.copy(calendarId = id, colorKey = null, color = null) }
+        // A fresh event re-inherits the new calendar's default reminder unless
+        // the user has already hand-edited it (guarded inside).
+        applyDefaultReminder(id)
+    }
     fun setAvailability(value: Availability) = update { it.copy(availability = value) }
     fun setAccessLevel(value: AccessLevel) = update { it.copy(accessLevel = value) }
 
+    /** Pick a palette colour (round-trips via its key); [argb] is its swatch. */
+    fun setColorKey(key: String, argb: Int) = update { it.copy(colorKey = key, color = argb) }
+
+    /** Pick a raw colour (local / opted-in calendars), clearing any palette key. */
+    fun setColorRaw(argb: Int) = update { it.copy(colorKey = null, color = argb) }
+
+    /** Clear the colour so the event inherits its calendar's. */
+    fun clearColor() = update { it.copy(colorKey = null, color = null) }
+
     /** Bare RRULE value from the recurrence picker; null = does not repeat. */
     fun setRecurrence(rrule: String?) = update { it.copy(rrule = rrule) }
 
-    fun addReminder(minutes: Int) = update {
-        it.copy(reminders = (it.reminders + minutes).distinct().sorted())
+    fun addReminder(minutes: Int) {
+        _remindersTouched.value = true
+        update { it.copy(reminders = (it.reminders + minutes).distinct().sorted()) }
     }
 
-    fun removeReminder(minutes: Int) = update {
-        it.copy(reminders = it.reminders - minutes)
+    fun removeReminder(minutes: Int) {
+        _remindersTouched.value = true
+        update { it.copy(reminders = it.reminders - minutes) }
     }
 
     /** Moving the start drags the end along, preserving the duration. */

app/src/main/java/de/jeanlucmakiola/calendula/ui/filter/CalendarFilterList.kt

@@ -1,25 +1,17 @@
 package de.jeanlucmakiola.calendula.ui.filter
 
 import androidx.compose.foundation.background
-import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.PaddingValues
-import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.size
-import androidx.compose.foundation.lazy.LazyColumn
-import androidx.compose.foundation.lazy.items
-import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material3.Checkbox
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
-import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextAlign
@@ -28,7 +20,9 @@ import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import de.jeanlucmakiola.calendula.R
 import de.jeanlucmakiola.calendula.domain.FailureReason
-import de.jeanlucmakiola.calendula.ui.common.pastelize
+import de.jeanlucmakiola.calendula.ui.common.CalendarColorChip
+import de.jeanlucmakiola.calendula.ui.common.GroupedRow
+import de.jeanlucmakiola.calendula.ui.common.positionOf
 
 /**
  * Calendar-visibility filter (M3), rendered inline in the navigation drawer.
@@ -53,67 +47,44 @@ fun CalendarFilterList(
     }
 }
 
+/**
+ * Renders as a plain (non-scrolling) [Column] so it flows inside the drawer's
+ * single scroll container — the whole sidebar scrolls as one. Calendar counts
+ * are small, so a lazy list isn't needed.
+ */
 @Composable
 private fun FilterList(
     groups: List<AccountGroup>,
     onSetVisible: (Long, Boolean) -> Unit,
     modifier: Modifier = Modifier,
 ) {
-    val dark = isSystemInDarkTheme()
-    LazyColumn(
-        modifier = modifier.fillMaxWidth(),
-        contentPadding = PaddingValues(vertical = 4.dp),
-    ) {
+    Column(modifier = modifier.fillMaxWidth()) {
         groups.forEach { group ->
-            item(key = "header-${group.account}") {
             Text(
                 text = group.account,
                 style = MaterialTheme.typography.labelMedium,
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
                 modifier = Modifier.padding(start = 28.dp, end = 28.dp, top = 12.dp, bottom = 4.dp),
             )
-            }
-            items(group.calendars, key = { it.id }) { cal ->
-                CalendarToggleRow(
-                    row = cal,
-                    dark = dark,
+            group.calendars.forEachIndexed { index, cal ->
+                GroupedRow(
+                    title = cal.displayName,
+                    position = positionOf(index, group.calendars.size),
+                    minHeight = 56.dp,
+                    leading = { CalendarColorChip(cal.color) },
+                    trailing = {
+                        Checkbox(
+                            checked = cal.visible,
                             onCheckedChange = { onSetVisible(cal.id, it) },
                         )
+                    },
+                    onClick = { onSetVisible(cal.id, !cal.visible) },
+                )
             }
         }
     }
 }
 
-@Composable
-private fun CalendarToggleRow(
-    row: CalendarRow,
-    dark: Boolean,
-    onCheckedChange: (Boolean) -> Unit,
-) {
-    Row(
-        modifier = Modifier
-            .fillMaxWidth()
-            .padding(horizontal = 28.dp, vertical = 6.dp),
-        verticalAlignment = Alignment.CenterVertically,
-        horizontalArrangement = Arrangement.spacedBy(16.dp),
-    ) {
-        Box(
-            modifier = Modifier
-                .size(14.dp)
-                .background(pastelize(row.color, dark), CircleShape),
-        )
-        Text(
-            text = row.displayName,
-            style = MaterialTheme.typography.bodyMedium,
-            modifier = Modifier.weight(1f),
-        )
-        Checkbox(
-            checked = row.visible,
-            onCheckedChange = onCheckedChange,
-        )
-    }
-}
-
 @Composable
 private fun FilterLoading(modifier: Modifier = Modifier) {
     Column(

app/src/main/java/de/jeanlucmakiola/calendula/ui/imports/ImportScreen.kt

@@ -0,0 +1,207 @@
+package de.jeanlucmakiola.calendula.ui.imports
+
+import android.net.Uri
+import androidx.activity.compose.BackHandler
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Close
+import androidx.compose.material3.Button
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.pluralStringResource
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.hilt.navigation.compose.hiltViewModel
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.domain.EventForm
+import de.jeanlucmakiola.calendula.domain.ics.IcsParseWarning
+import de.jeanlucmakiola.calendula.ui.common.OptionCard
+
+/**
+ * Handles an opened/received `.ics` file. A single event is handed straight to
+ * the prefilled create form via [onOpenSingle]; several events show a target-
+ * calendar picker and import in bulk (dedup by UID), then a result summary.
+ * Empty/failed files show a short message and close.
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun ImportScreen(
+    uri: Uri,
+    onClose: () -> Unit,
+    onOpenSingle: (EventForm) -> Unit,
+    viewModel: ImportViewModel = hiltViewModel(),
+) {
+    LaunchedEffect(uri) { viewModel.load(uri) }
+    val state by viewModel.state.collectAsStateWithLifecycle()
+    BackHandler(onBack = onClose)
+
+    // A single event isn't shown here — it opens the create form for review.
+    LaunchedEffect(state) {
+        (state as? ImportUiState.Single)?.let { onOpenSingle(it.form); onClose() }
+    }
+
+    Scaffold(
+        modifier = Modifier.fillMaxSize(),
+        topBar = {
+            TopAppBar(
+                title = { Text(stringResource(R.string.import_title)) },
+                navigationIcon = {
+                    IconButton(onClick = onClose) {
+                        Icon(Icons.Default.Close, contentDescription = stringResource(R.string.event_edit_close))
+                    }
+                },
+                colors = TopAppBarDefaults.topAppBarColors(
+                    containerColor = MaterialTheme.colorScheme.surface,
+                ),
+            )
+        },
+    ) { padding ->
+        Box(Modifier.fillMaxSize().padding(padding)) {
+            when (val s = state) {
+                ImportUiState.Loading,
+                ImportUiState.Importing,
+                is ImportUiState.Single,
+                -> CircularProgressIndicator(Modifier.align(Alignment.Center))
+
+                ImportUiState.Empty -> CenteredMessage(stringResource(R.string.import_empty), onClose)
+                ImportUiState.Failed -> CenteredMessage(stringResource(R.string.import_failed), onClose)
+                is ImportUiState.Many -> ManyContent(s, onImport = viewModel::import)
+                is ImportUiState.Done -> DoneContent(s, onClose)
+            }
+        }
+    }
+}
+
+@Composable
+private fun ManyContent(state: ImportUiState.Many, onImport: (Long) -> Unit) {
+    // No writable calendar to import into — tell the user honestly.
+    if (state.calendars.isEmpty()) {
+        CenteredMessage(stringResource(R.string.import_no_calendar), onClose = null)
+        return
+    }
+    var selected by rememberSaveable { mutableStateOf(state.calendars.first().id) }
+
+    Column(
+        Modifier.fillMaxSize().verticalScroll(rememberScrollState())
+            .padding(horizontal = 16.dp, vertical = 8.dp),
+        verticalArrangement = Arrangement.spacedBy(8.dp),
+    ) {
+        Text(
+            pluralStringResource(R.plurals.import_event_count, state.events.size, state.events.size),
+            style = MaterialTheme.typography.bodyLarge,
+            modifier = Modifier.padding(vertical = 8.dp),
+        )
+        Text(
+            stringResource(R.string.import_target_header),
+            style = MaterialTheme.typography.labelLarge,
+            color = MaterialTheme.colorScheme.primary,
+        )
+        state.calendars.forEach { calendar ->
+            OptionCard(
+                label = calendar.displayName,
+                onClick = { selected = calendar.id },
+                selected = calendar.id == selected,
+                icon = null,
+            )
+        }
+        state.warnings.forEach { WarningText(it) }
+        Button(
+            onClick = { onImport(selected) },
+            modifier = Modifier.fillMaxWidth().padding(top = 8.dp),
+        ) {
+            Text(pluralStringResource(R.plurals.import_action, state.events.size, state.events.size))
+        }
+    }
+}
+
+@Composable
+private fun DoneContent(state: ImportUiState.Done, onClose: () -> Unit) {
+    Column(
+        Modifier.fillMaxSize().padding(24.dp),
+        verticalArrangement = Arrangement.spacedBy(12.dp),
+        horizontalAlignment = Alignment.CenterHorizontally,
+    ) {
+        Text(
+            stringResource(R.string.import_done_title),
+            style = MaterialTheme.typography.headlineSmall,
+            modifier = Modifier.padding(top = 24.dp),
+        )
+        Text(
+            pluralStringResource(
+                R.plurals.import_done_imported,
+                state.summary.imported,
+                state.summary.imported,
+            ),
+            style = MaterialTheme.typography.bodyLarge,
+        )
+        if (state.summary.skippedDuplicate > 0) {
+            Text(
+                pluralStringResource(
+                    R.plurals.import_done_skipped,
+                    state.summary.skippedDuplicate,
+                    state.summary.skippedDuplicate,
+                ),
+                style = MaterialTheme.typography.bodyMedium,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+            )
+        }
+        Button(onClick = onClose, modifier = Modifier.padding(top = 12.dp)) {
+            Text(stringResource(R.string.import_close))
+        }
+    }
+}
+
+@Composable
+private fun WarningText(warning: IcsParseWarning) {
+    val text = when (warning) {
+        IcsParseWarning.ModifiedOccurrenceSkipped -> stringResource(R.string.import_warning_recurrence)
+        IcsParseWarning.EventWithoutStartSkipped -> stringResource(R.string.import_warning_no_start)
+        IcsParseWarning.AttendeesIgnored -> stringResource(R.string.import_warning_attendees)
+        IcsParseWarning.UnknownTimezone -> stringResource(R.string.import_warning_timezone)
+    }
+    Text(
+        text = text,
+        style = MaterialTheme.typography.bodySmall,
+        color = MaterialTheme.colorScheme.onSurfaceVariant,
+    )
+}
+
+@Composable
+private fun CenteredMessage(message: String, onClose: (() -> Unit)?) {
+    Box(Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+        Column(
+            Modifier.padding(24.dp),
+            verticalArrangement = Arrangement.spacedBy(16.dp),
+            horizontalAlignment = Alignment.CenterHorizontally,
+        ) {
+            Text(message, style = MaterialTheme.typography.bodyLarge)
+            if (onClose != null) {
+                Button(onClick = onClose) { Text(stringResource(R.string.import_close)) }
+            }
+        }
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/imports/ImportViewModel.kt

@@ -0,0 +1,105 @@
+package de.jeanlucmakiola.calendula.ui.imports
+
+import android.net.Uri
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import dagger.hilt.android.lifecycle.HiltViewModel
+import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
+import de.jeanlucmakiola.calendula.data.di.IoDispatcher
+import de.jeanlucmakiola.calendula.data.ics.IcsImporter
+import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.EventForm
+import de.jeanlucmakiola.calendula.domain.ics.IcsImportSummary
+import de.jeanlucmakiola.calendula.domain.ics.IcsParseWarning
+import de.jeanlucmakiola.calendula.domain.ics.IcsParser
+import de.jeanlucmakiola.calendula.domain.ics.ParsedIcsEvent
+import de.jeanlucmakiola.calendula.domain.ics.toEventForm
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import kotlinx.datetime.TimeZone
+import kotlin.coroutines.cancellation.CancellationException
+import javax.inject.Inject
+
+/** What an opened/received `.ics` resolved to. */
+sealed interface ImportUiState {
+    data object Loading : ImportUiState
+    data object Importing : ImportUiState
+
+    /** The file held no importable event (or couldn't be read/parsed as one). */
+    data object Empty : ImportUiState
+    data object Failed : ImportUiState
+
+    /** Exactly one event → review it in the prefilled create form. */
+    data class Single(val form: EventForm, val warnings: Set<IcsParseWarning>) : ImportUiState
+
+    /** Several events → pick a target calendar and bulk-import. */
+    data class Many(
+        val events: List<ParsedIcsEvent>,
+        val warnings: Set<IcsParseWarning>,
+        val calendars: List<CalendarSource>,
+    ) : ImportUiState
+
+    data class Done(val summary: IcsImportSummary) : ImportUiState
+}
+
+/**
+ * Reads an `.ics` [Uri], parses it (pure [IcsParser]) and routes by event count:
+ * one event opens the create form for review, many open the bulk-import picker.
+ * The bulk import dedups by UID in the repository.
+ */
+@HiltViewModel
+class ImportViewModel @Inject constructor(
+    private val repository: CalendarRepository,
+    private val importer: IcsImporter,
+    @IoDispatcher private val io: CoroutineDispatcher,
+) : ViewModel() {
+
+    private val parser = IcsParser()
+    private val _state = MutableStateFlow<ImportUiState>(ImportUiState.Loading)
+    val state: StateFlow<ImportUiState> = _state.asStateFlow()
+    private var started = false
+
+    /** Read + parse [uri] once; subsequent calls (recomposition) are ignored. */
+    fun load(uri: Uri) {
+        if (started) return
+        started = true
+        viewModelScope.launch {
+            val parsed = withContext(io) {
+                importer.readText(uri)?.let(parser::parse)
+            }
+            _state.value = when {
+                parsed == null -> ImportUiState.Failed
+                parsed.events.isEmpty() -> ImportUiState.Empty
+                parsed.events.size == 1 -> ImportUiState.Single(
+                    form = parsed.events.single().toEventForm(TimeZone.currentSystemDefault()),
+                    warnings = parsed.warnings,
+                )
+                else -> ImportUiState.Many(
+                    events = parsed.events,
+                    warnings = parsed.warnings,
+                    calendars = repository.calendars().first().filter { it.canModifyContents },
+                )
+            }
+        }
+    }
+
+    /** Bulk-import the parsed events into [targetCalendarId]; result → [ImportUiState.Done]. */
+    fun import(targetCalendarId: Long) {
+        val many = _state.value as? ImportUiState.Many ?: return
+        viewModelScope.launch {
+            _state.value = ImportUiState.Importing
+            _state.value = try {
+                ImportUiState.Done(repository.importEvents(targetCalendarId, many.events))
+            } catch (e: CancellationException) {
+                throw e
+            } catch (e: Exception) {
+                ImportUiState.Failed
+            }
+        }
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/month/MonthScreen.kt

@@ -86,7 +86,7 @@ fun MonthScreen(
     onSelectView: (CalendarView) -> Unit,
     onOpenDay: (LocalDate) -> Unit,
     onOpenSettings: () -> Unit,
-    onCreateEvent: (LocalDate) -> Unit,
+    onCreateEvent: (LocalDate, Int?) -> Unit,
     modifier: Modifier = Modifier,
     viewModel: MonthViewModel = hiltViewModel(),
 ) {
@@ -124,6 +124,11 @@ fun MonthScreen(
         }
         viewModel.goToToday()
     }
+    // Drawer jump-to-date: slide from the side the target month lies on.
+    val jumpToDate: (LocalDate) -> Unit = { target ->
+        slideDir = if (YearMonth(target.year, target.month) < month) -1 else 1
+        viewModel.goToDate(target)
+    }
 
     ModalNavigationDrawer(
         drawerState = drawerState,
@@ -132,10 +137,15 @@ fun MonthScreen(
         drawerContent = {
             CalendarDrawer(
                 currentView = selectedView,
+                currentDate = LocalDate(month.year, month.month, 1),
                 onSelectView = { view ->
                     onSelectView(view)
                     scope.launch { drawerState.close() }
                 },
+                onJumpToDate = { target ->
+                    jumpToDate(target)
+                    scope.launch { drawerState.close() }
+                },
                 onSettings = {
                     onOpenSettings()
                     scope.launch { drawerState.close() }
@@ -166,6 +176,7 @@ fun MonthScreen(
                         onCreateEvent(
                             if (isOnCurrentMonth) today
                             else LocalDate(month.year, month.month, 1),
+                            null,
                         )
                     },
                 )

app/src/main/java/de/jeanlucmakiola/calendula/ui/month/MonthViewModel.kt

@@ -96,6 +96,11 @@ class MonthViewModel @Inject constructor(
         _month.value = YearMonth(todayDate.year, todayDate.month)
     }
 
+    /** Jump to the month containing [date] (drawer jump-to-date). */
+    fun goToDate(date: LocalDate) {
+        _month.value = YearMonth(date.year, date.month)
+    }
+
     private fun buildState(
         ym: YearMonth,
         weekStart: DayOfWeek,
@@ -108,21 +113,26 @@ class MonthViewModel @Inject constructor(
         return MonthUiState.Success(
             month = ym,
             today = todayDate,
-            weeks = layoutMonth(ym, weekStart, instances),
+            weeks = layoutMonthWeeks(ym, weekStart, instances, zone),
         )
     }
+}
 
-    /**
-     * Split the grid into week rows and resolve each row's events. An event is a
-     * spanning bar when it's all-day or touches more than one of the row's days;
+/**
+ * Split the month grid into week rows and resolve each row's events. An event is
+ * a spanning bar when it's all-day or touches more than one of the row's days;
  * everything else is a single-day timed pill. Bars get lanes from the shared
  * [layoutAllDay] so a multi-day event stays on one row across the week.
+ *
+ * Shared by the Month screen and the month home-screen widget so both lay out
+ * spans, lanes and per-day counts identically.
  */
-    private fun layoutMonth(
+internal fun layoutMonthWeeks(
     ym: YearMonth,
     weekStart: DayOfWeek,
     instances: List<EventInstance>,
-    ): List<MonthWeek> {
+    zone: TimeZone,
+): List<MonthWeek> {
     val firstOfMonth = LocalDate(ym.year, ym.month, 1)
     val gridStart = firstOfMonth.startOfGridWeek(weekStart)
     val leadOffset = ((firstOfMonth.dayOfWeek.ordinal - weekStart.ordinal) + 7) % 7
@@ -155,7 +165,6 @@ class MonthViewModel @Inject constructor(
             countByDay = days.associateWith { d -> weekEvents.count { it.coversDay(d, zone) } },
         )
     }
-    }
 }
 
 /**

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/AppLanguage.kt

@@ -1,36 +1,78 @@
 package de.jeanlucmakiola.calendula.ui.settings
 
+import android.content.Context
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.core.os.LocaleListCompat
+import de.jeanlucmakiola.calendula.R
+import org.xmlpull.v1.XmlPullParser
+import java.util.Locale
 
-/** UI-facing language choice. AUTO follows the system languages. */
-enum class LanguagePref { AUTO, GERMAN, ENGLISH }
+private const val ANDROID_NS = "http://schemas.android.com/apk/res/android"
 
 /**
- * Per-app language via AppCompatDelegate. On API 33+ this delegates to the
- * platform per-app-languages API; below that the appcompat backport persists
- * the choice itself (manifest `autoStoreLocales` service), so we don't mirror
- * it in DataStore. Setting a locale recreates the activity, which re-reads the
- * current value for the dropdown.
+ * Per-app language via AppCompatDelegate, driven by res/xml/locales_config.xml.
+ *
+ * That file is the single source of truth for which languages we ship: dropping
+ * in a values-<tag> translation and adding a matching `<locale>` entry makes the
+ * language show up here and in the system per-app-language settings, with no
+ * other code change. The system-default choice is represented as `null`.
+ *
+ * On API 33+ this delegates to the platform per-app-languages API; below that
+ * the appcompat backport persists the choice itself (manifest `autoStoreLocales`
+ * service), so we don't mirror it in DataStore. Setting a locale recreates the
+ * activity, which re-reads the current value for the picker.
  */
 object AppLanguage {
 
-    fun current(): LanguagePref {
-        val locales = AppCompatDelegate.getApplicationLocales()
-        if (locales.isEmpty) return LanguagePref.AUTO
-        return when (locales[0]?.language) {
-            "de" -> LanguagePref.GERMAN
-            "en" -> LanguagePref.ENGLISH
-            else -> LanguagePref.AUTO
+    /**
+     * The BCP-47 tags the app ships translations for, in declaration order, as
+     * listed in locales_config.xml. Returns whatever could be parsed; a missing
+     * or malformed config yields an empty list (the picker then offers only the
+     * system-default entry rather than crashing).
+     */
+    fun supportedTags(context: Context): List<String> {
+        val tags = mutableListOf<String>()
+        val parser = context.resources.getXml(R.xml.locales_config)
+        try {
+            var event = parser.eventType
+            while (event != XmlPullParser.END_DOCUMENT) {
+                if (event == XmlPullParser.START_TAG && parser.name == "locale") {
+                    parser.getAttributeValue(ANDROID_NS, "name")?.let(tags::add)
                 }
+                event = parser.next()
+            }
+        } catch (_: Exception) {
+            // Fall back to whatever was parsed before the failure.
+        } finally {
+            parser.close()
+        }
+        return tags
     }
 
-    fun apply(pref: LanguagePref) {
-        val locales = when (pref) {
-            LanguagePref.AUTO -> LocaleListCompat.getEmptyLocaleList()
-            LanguagePref.GERMAN -> LocaleListCompat.forLanguageTags("de")
-            LanguagePref.ENGLISH -> LocaleListCompat.forLanguageTags("en")
+    /** The applied app language as a BCP-47 tag, or `null` when following the system. */
+    fun currentTag(): String? {
+        val locales = AppCompatDelegate.getApplicationLocales()
+        return if (locales.isEmpty) null else locales[0]?.toLanguageTag()
+    }
+
+    /** Apply a BCP-47 tag, or `null` to follow the system languages. */
+    fun apply(tag: String?) {
+        val locales = if (tag == null) {
+            LocaleListCompat.getEmptyLocaleList()
+        } else {
+            LocaleListCompat.forLanguageTags(tag)
         }
         AppCompatDelegate.setApplicationLocales(locales)
     }
+
+    /**
+     * The autonym for a tag — the language's own name in its own script, e.g.
+     * "Deutsch", "English", "Français" — so users find their language regardless
+     * of the current UI language. Capitalised per the language's own rules.
+     */
+    fun displayName(tag: String): String {
+        val locale = Locale.forLanguageTag(tag)
+        return locale.getDisplayName(locale)
+            .replaceFirstChar { if (it.isLowerCase()) it.titlecase(locale) else it.toString() }
+    }
 }

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/SettingsUiState.kt

@@ -3,6 +3,7 @@ package de.jeanlucmakiola.calendula.ui.settings
 import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
 import de.jeanlucmakiola.calendula.data.prefs.ThemeMode
 import de.jeanlucmakiola.calendula.data.prefs.WeekStartPref
+import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventFormField
 
 /**
@@ -20,4 +21,28 @@ data class SettingsUiState(
     val defaultFormFields: Set<EventFormField> = SettingsPrefs.DEFAULT_FORM_FIELDS,
     /** Whether Calendula posts reminder notifications (v1.4). */
     val remindersEnabled: Boolean = true,
+    /**
+     * The default reminder lead time (minutes) prefilled on new timed events;
+     * null = no default reminder. Per-calendar overrides take precedence.
+     */
+    val defaultReminderMinutes: Int? = null,
+    /** The default reminder lead time prefilled on new all-day events; null = none. */
+    val defaultAllDayReminderMinutes: Int? = null,
+    /** Wall-clock time (minutes from midnight) all-day reminders fire at; default 09:00. */
+    val allDayReminderTimeMinutes: Int = SettingsPrefs.DEFAULT_ALLDAY_REMINDER_TIME,
+    /**
+     * Per-calendar overrides of [defaultReminderMinutes] for timed events: a
+     * calendar present in the map overrides the global default (null value = no
+     * reminder); absent = inherit the global default.
+     */
+    val perCalendarReminderOverride: Map<Long, Int?> = emptyMap(),
+    /** Per-calendar overrides of [defaultAllDayReminderMinutes] for all-day events. */
+    val perCalendarAllDayReminderOverride: Map<Long, Int?> = emptyMap(),
+    /** Writable calendars, shown as per-calendar reminder-override rows. */
+    val writableCalendars: List<CalendarSource> = emptyList(),
+    /**
+     * Whether the event-colour picker is offered on calendars that publish no
+     * colour palette (the colour may then not survive their next sync).
+     */
+    val allowColorOnUnsupportedCalendars: Boolean = false,
 )

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/SettingsViewModel.kt

@@ -4,13 +4,19 @@ import android.os.Build
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
+import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
+import de.jeanlucmakiola.calendula.data.prefs.CalendarReminderOverride
 import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
 import de.jeanlucmakiola.calendula.data.prefs.ThemeMode
 import de.jeanlucmakiola.calendula.data.prefs.WeekStartPref
+import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventFormField
+import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.catch
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
 import javax.inject.Inject
@@ -18,11 +24,20 @@ import javax.inject.Inject
 @HiltViewModel
 class SettingsViewModel @Inject constructor(
     private val prefs: SettingsPrefs,
+    repository: CalendarRepository,
 ) : ViewModel() {
 
     private val dynamicColorAvailable = Build.VERSION.SDK_INT >= Build.VERSION_CODES.S
 
+    /** Writable calendars — the only ones that take a per-calendar reminder override. */
+    private val writableCalendars: Flow<List<CalendarSource>> = repository.calendars()
+        .map { calendars -> calendars.filter { it.canModifyContents } }
+        .catch { emit(emptyList()) }
+
     val state: StateFlow<SettingsUiState> =
+        combine(
+            // combine() types up to five flows, so the prefs split into two
+            // groups that fold together in the outer combine.
             combine(
                 prefs.themeMode,
                 prefs.dynamicColor,
@@ -38,12 +53,51 @@ class SettingsViewModel @Inject constructor(
                     defaultFormFields = formFields,
                     remindersEnabled = reminders,
                 )
+            },
+            combine(
+                prefs.allowColorOnUnsupportedCalendars,
+                prefs.defaultReminderMinutes,
+                prefs.defaultAllDayReminderMinutes,
+                prefs.allDayReminderTimeMinutes,
+            ) { allowColor, defaultReminder, allDayReminder, allDayReminderTime ->
+                ReminderDefaults(allowColor, defaultReminder, allDayReminder, allDayReminderTime)
+            },
+            combine(
+                prefs.perCalendarReminderOverride,
+                prefs.perCalendarAllDayReminderOverride,
+                writableCalendars,
+            ) { overrides, allDayOverrides, calendars ->
+                ReminderOverrides(overrides, allDayOverrides, calendars)
+            },
+        ) { base, defaults, overrides ->
+            base.copy(
+                allowColorOnUnsupportedCalendars = defaults.allowColor,
+                defaultReminderMinutes = defaults.defaultReminder,
+                defaultAllDayReminderMinutes = defaults.allDayReminder,
+                allDayReminderTimeMinutes = defaults.allDayReminderTime,
+                perCalendarReminderOverride = overrides.timed,
+                perCalendarAllDayReminderOverride = overrides.allDay,
+                writableCalendars = overrides.calendars,
+            )
         }.stateIn(
             scope = viewModelScope,
             started = SharingStarted.WhileSubscribed(5_000L),
             initialValue = SettingsUiState(dynamicColorAvailable = dynamicColorAvailable),
         )
 
+    private data class ReminderDefaults(
+        val allowColor: Boolean,
+        val defaultReminder: Int?,
+        val allDayReminder: Int?,
+        val allDayReminderTime: Int,
+    )
+
+    private data class ReminderOverrides(
+        val timed: Map<Long, Int?>,
+        val allDay: Map<Long, Int?>,
+        val calendars: List<CalendarSource>,
+    )
+
     fun setThemeMode(mode: ThemeMode) {
         viewModelScope.launch { prefs.setThemeMode(mode) }
     }
@@ -63,4 +117,28 @@ class SettingsViewModel @Inject constructor(
     fun setRemindersEnabled(enabled: Boolean) {
         viewModelScope.launch { prefs.setRemindersEnabled(enabled) }
     }
+
+    fun setDefaultReminderMinutes(minutes: Int?) {
+        viewModelScope.launch { prefs.setDefaultReminderMinutes(minutes) }
+    }
+
+    fun setDefaultAllDayReminderMinutes(minutes: Int?) {
+        viewModelScope.launch { prefs.setDefaultAllDayReminderMinutes(minutes) }
+    }
+
+    fun setAllDayReminderTimeMinutes(minutesOfDay: Int) {
+        viewModelScope.launch { prefs.setAllDayReminderTimeMinutes(minutesOfDay) }
+    }
+
+    fun setCalendarReminderOverride(calendarId: Long, override: CalendarReminderOverride) {
+        viewModelScope.launch { prefs.setCalendarReminderOverride(calendarId, override) }
+    }
+
+    fun setCalendarAllDayReminderOverride(calendarId: Long, override: CalendarReminderOverride) {
+        viewModelScope.launch { prefs.setCalendarAllDayReminderOverride(calendarId, override) }
+    }
+
+    fun setAllowColorOnUnsupportedCalendars(enabled: Boolean) {
+        viewModelScope.launch { prefs.setAllowColorOnUnsupportedCalendars(enabled) }
+    }
 }

app/src/main/java/de/jeanlucmakiola/calendula/ui/week/WeekScreen.kt

@@ -6,6 +6,7 @@ import androidx.compose.animation.core.animateDpAsState
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.gestures.detectHorizontalDragGestures
+import androidx.compose.foundation.gestures.detectTapGestures
 import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
@@ -112,7 +113,7 @@ fun WeekScreen(
     onSelectView: (CalendarView) -> Unit,
     onEventClick: (EventInstance) -> Unit,
     onOpenSettings: () -> Unit,
-    onCreateEvent: (LocalDate) -> Unit,
+    onCreateEvent: (LocalDate, Int?) -> Unit,
     modifier: Modifier = Modifier,
     viewModel: WeekViewModel = hiltViewModel(),
 ) {
@@ -155,6 +156,11 @@ fun WeekScreen(
         }
         viewModel.goToToday()
     }
+    // Drawer jump-to-date: slide from the side the target week lies on.
+    val jumpToDate: (LocalDate) -> Unit = { target ->
+        slideDir = if (target < weekStart) -1 else 1
+        viewModel.goToDate(target)
+    }
 
     ModalNavigationDrawer(
         drawerState = drawerState,
@@ -163,10 +169,15 @@ fun WeekScreen(
         drawerContent = {
             CalendarDrawer(
                 currentView = selectedView,
+                currentDate = weekStart,
                 onSelectView = { view ->
                     onSelectView(view)
                     scope.launch { drawerState.close() }
                 },
+                onJumpToDate = { target ->
+                    jumpToDate(target)
+                    scope.launch { drawerState.close() }
+                },
                 onSettings = {
                     onOpenSettings()
                     scope.launch { drawerState.close() }
@@ -194,7 +205,7 @@ fun WeekScreen(
                         // Anchor on today when it's in view, else the week's first day.
                         val today = Clock.System.now()
                             .toLocalDateTime(TimeZone.currentSystemDefault()).date
-                        onCreateEvent(if (isOnCurrentWeek) today else weekStart)
+                        onCreateEvent(if (isOnCurrentWeek) today else weekStart, null)
                     },
                 )
             },
@@ -207,6 +218,7 @@ fun WeekScreen(
                 onSwipePrev = goPrev,
                 onRetry = jumpToToday,
                 onEventClick = onEventClick,
+                onCreateAt = { d, minutes -> onCreateEvent(d, minutes) },
                 modifier = Modifier
                     .padding(innerPadding)
                     .fillMaxSize(),
@@ -224,6 +236,7 @@ private fun WeekContent(
     onSwipePrev: () -> Unit,
     onRetry: () -> Unit,
     onEventClick: (EventInstance) -> Unit,
+    onCreateAt: (LocalDate, Int) -> Unit,
     modifier: Modifier = Modifier,
 ) {
     val density = LocalDensity.current
@@ -295,6 +308,7 @@ private fun WeekContent(
                 scrollState = scrollState,
                 allDayHeight = allDayHeight,
                 onEventClick = onEventClick,
+                onCreateAt = onCreateAt,
             )
         }
     }
@@ -307,6 +321,7 @@ private fun WeekSuccess(
     scrollState: ScrollState,
     allDayHeight: Dp,
     onEventClick: (EventInstance) -> Unit,
+    onCreateAt: (LocalDate, Int) -> Unit,
 ) {
     Column(modifier = Modifier.fillMaxSize()) {
         Column(
@@ -320,7 +335,12 @@ private fun WeekSuccess(
         // Breathing room between the (colour-shifting) top section and the
         // scrolling timeline below.
         Spacer(Modifier.height(8.dp))
-        Timeline(state = state, scrollState = scrollState, onEventClick = onEventClick)
+        Timeline(
+            state = state,
+            scrollState = scrollState,
+            onEventClick = onEventClick,
+            onCreateAt = onCreateAt,
+        )
     }
 }
 
@@ -533,6 +553,7 @@ private fun Timeline(
     state: WeekUiState.Success,
     scrollState: ScrollState,
     onEventClick: (EventInstance) -> Unit,
+    onCreateAt: (LocalDate, Int) -> Unit,
 ) {
     val totalHeight = HOUR_HEIGHT * 24
     val dark = isSystemInDarkTheme()
@@ -588,7 +609,9 @@ private fun Timeline(
                         DayColumnCard(
                             blocks = state.timedByDay[day].orEmpty(),
                             dark = dark,
+                            date = day,
                             onEventClick = onEventClick,
+                            onCreateAt = onCreateAt,
                             modifier = Modifier
                                 .weight(1f)
                                 .fillMaxHeight(),
@@ -604,9 +627,12 @@ private fun Timeline(
 private fun DayColumnCard(
     blocks: List<TimedBlock>,
     dark: Boolean,
+    date: LocalDate,
     onEventClick: (EventInstance) -> Unit,
+    onCreateAt: (LocalDate, Int) -> Unit,
     modifier: Modifier = Modifier,
 ) {
+    val hourPx = with(LocalDensity.current) { HOUR_HEIGHT.toPx() }
     Card(
         // Plain rectangular columns — the soft corners come from the outer
         // rounded scroll viewport, so inner rounding would look odd at the edges.
@@ -616,7 +642,18 @@ private fun DayColumnCard(
         ),
         modifier = modifier,
     ) {
-        BoxWithConstraints(modifier = Modifier.fillMaxSize()) {
+        BoxWithConstraints(
+            modifier = Modifier
+                .fillMaxSize()
+                // Tap an empty slot to create an event there; taps on event
+                // blocks are consumed by their own handler first. Snaps to hour.
+                .pointerInput(date) {
+                    detectTapGestures { offset ->
+                        val hour = (offset.y / hourPx).toInt().coerceIn(0, 23)
+                        onCreateAt(date, hour * 60)
+                    }
+                },
+        ) {
             val colWidth = maxWidth
             blocks.forEach { block ->
                 val laneWidth = colWidth / block.laneCount

app/src/main/java/de/jeanlucmakiola/calendula/ui/week/WeekViewModel.kt

@@ -107,6 +107,11 @@ class WeekViewModel @Inject constructor(
         _anchor.value = todayDate
     }
 
+    /** Jump to the week containing [date] (drawer jump-to-date). */
+    fun goToDate(date: LocalDate) {
+        _anchor.value = date
+    }
+
     private fun buildState(
         start: LocalDate,
         calendars: List<CalendarSource>,
@@ -176,6 +181,18 @@ internal fun weekRange(start: LocalDate, zone: TimeZone): ClosedRange<Instant> {
 
 /** True if this event overlaps the calendar [day] in [zone] (any portion). */
 internal fun EventInstance.coversDay(day: LocalDate, zone: TimeZone): Boolean {
+    if (isAllDay) {
+        // All-day events live at UTC midnights with an exclusive end. Compare
+        // calendar dates in UTC and step the exclusive end back to the last
+        // covered day (mirroring the detail/edit views), so a one-day event
+        // covers exactly its single date. Slicing the day in the device zone
+        // would push the exclusive end a few hours into the next local day
+        // east of UTC, making the event leak onto day + 1.
+        val startDate = start.toLocalDateTime(TimeZone.UTC).date
+        val endExclusive = end.toLocalDateTime(TimeZone.UTC).date
+        val lastDay = maxOf(startDate, endExclusive.minus(1, DateTimeUnit.DAY))
+        return day in startDate..lastDay
+    }
     val dayStart = day.atStartOfDayIn(zone)
     val dayEnd = day.plus(1, DateTimeUnit.DAY).atStartOfDayIn(zone)
     return start < dayEnd && end > dayStart

app/src/main/java/de/jeanlucmakiola/calendula/widget/WidgetData.kt

@@ -0,0 +1,113 @@
+package de.jeanlucmakiola.calendula.widget
+
+import android.Manifest
+import android.content.Context
+import android.content.pm.PackageManager
+import androidx.core.content.ContextCompat
+import de.jeanlucmakiola.calendula.data.prefs.resolveFirstDay
+import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.ui.agenda.AgendaDay
+import de.jeanlucmakiola.calendula.ui.agenda.agendaRange
+import de.jeanlucmakiola.calendula.ui.agenda.groupAgendaDays
+import kotlinx.coroutines.flow.first
+import kotlinx.datetime.DateTimeUnit
+import kotlinx.datetime.DayOfWeek
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.atStartOfDayIn
+import kotlinx.datetime.atTime
+import kotlinx.datetime.minus
+import kotlinx.datetime.plus
+import kotlinx.datetime.toInstant
+import kotlinx.datetime.toLocalDateTime
+import java.util.Locale
+import kotlin.time.Clock
+
+/** How far ahead the agenda widget loads (a month of upcoming events). */
+private const val AGENDA_WIDGET_DAYS = 30
+
+/**
+ * How far either side of today the month widget pre-loads. The displayed month
+ * is chosen reactively in the composition, so one wide read covers ~13 months of
+ * prev/next navigation without re-querying on every arrow tap.
+ */
+private const val MONTH_WIDGET_RANGE_DAYS = 400
+
+internal fun systemZone(): TimeZone = TimeZone.currentSystemDefault()
+
+internal fun today(zone: TimeZone): LocalDate =
+    Clock.System.now().toLocalDateTime(zone).date
+
+internal fun Context.hasCalendarPermission(): Boolean =
+    ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CALENDAR) ==
+        PackageManager.PERMISSION_GRANTED
+
+/** Snapshot rendered by the agenda widget. */
+sealed interface AgendaWidgetData {
+    /** Calendar permission not granted — the widget can't read events. */
+    data object NeedsPermission : AgendaWidgetData
+    data class Ready(val today: LocalDate, val days: List<AgendaDay>) : AgendaWidgetData
+}
+
+/**
+ * Source data for the month widget: a wide window of instances plus the
+ * week-start preference and today. The widget computes each displayed month's
+ * grid from this in-memory list (via `layoutMonthWeeks`) as the user pages,
+ * so month navigation is pure recomposition — no reload, no flaky widget
+ * session restart.
+ */
+sealed interface MonthWidgetSource {
+    data object NeedsPermission : MonthWidgetSource
+    data class Ready(
+        val today: LocalDate,
+        val weekStart: DayOfWeek,
+        val instances: List<EventInstance>,
+    ) : MonthWidgetSource
+}
+
+/**
+ * Process-lived cache of the wide month window. Month navigation re-runs
+ * `provideGlance` (via `updateAll`), and re-querying ~13 months of instances on
+ * every arrow tap is what made paging feel sluggish — so we load once and reuse
+ * the same snapshot for every nearby month. Invalidated by
+ * [invalidateMonthWidgetCache] when calendar data changes (the freshness
+ * receiver), and automatically when the day rolls over (the `today` guard).
+ */
+internal object MonthWidgetCache {
+    @Volatile
+    var data: MonthWidgetSource.Ready? = null
+}
+
+internal fun invalidateMonthWidgetCache() {
+    MonthWidgetCache.data = null
+}
+
+/**
+ * One-shot read of the upcoming agenda for the widget. Reuses the app's
+ * [agendaRange] window and [groupAgendaDays] grouping, and the repository's
+ * [first]-emitted snapshot already has hidden calendars filtered out.
+ */
+internal suspend fun Context.loadAgendaWidgetData(): AgendaWidgetData {
+    if (!hasCalendarPermission()) return AgendaWidgetData.NeedsPermission
+    val zone = systemZone()
+    val anchor = today(zone)
+    val repo = widgetEntryPoint().calendarRepository()
+    val instances = repo.instances(agendaRange(anchor, AGENDA_WIDGET_DAYS, zone)).first()
+    return AgendaWidgetData.Ready(today = anchor, days = groupAgendaDays(anchor, instances, zone))
+}
+
+/** One-shot wide read backing the month widget's grid for any nearby month. */
+internal suspend fun Context.loadMonthWidgetSource(): MonthWidgetSource {
+    if (!hasCalendarPermission()) return MonthWidgetSource.NeedsPermission
+    val zone = systemZone()
+    val anchor = today(zone)
+    // Reuse the cached window unless the day changed (then it's stale for "today").
+    MonthWidgetCache.data?.let { if (it.today == anchor) return it }
+    val ep = widgetEntryPoint()
+    val weekStart = ep.settingsPrefs().weekStart.first().resolveFirstDay(Locale.getDefault())
+    val from = anchor.minus(MONTH_WIDGET_RANGE_DAYS, DateTimeUnit.DAY).atStartOfDayIn(zone)
+    val to = anchor.plus(MONTH_WIDGET_RANGE_DAYS, DateTimeUnit.DAY).atTime(23, 59, 59).toInstant(zone)
+    val instances = ep.calendarRepository().instances(from..to).first()
+    return MonthWidgetSource.Ready(today = anchor, weekStart = weekStart, instances = instances)
+        .also { MonthWidgetCache.data = it }
+}

app/src/main/java/de/jeanlucmakiola/calendula/widget/WidgetEntryPoint.kt

@@ -0,0 +1,27 @@
+package de.jeanlucmakiola.calendula.widget
+
+import android.content.Context
+import dagger.hilt.EntryPoint
+import dagger.hilt.InstallIn
+import dagger.hilt.android.EntryPointAccessors
+import dagger.hilt.components.SingletonComponent
+import de.jeanlucmakiola.calendula.data.calendar.CalendarRepository
+import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
+
+/**
+ * Hilt bridge for the Glance widgets. A [androidx.glance.appwidget.GlanceAppWidget]
+ * is instantiated by the framework, not by Hilt, so it can't take constructor
+ * injection. We instead reach the singleton graph through this entry point and
+ * read the same [CalendarRepository] / [SettingsPrefs] the app uses — so widget
+ * data (hidden-calendar filtering, week-start preference, …) matches the app
+ * one-to-one.
+ */
+@EntryPoint
+@InstallIn(SingletonComponent::class)
+interface WidgetEntryPoint {
+    fun calendarRepository(): CalendarRepository
+    fun settingsPrefs(): SettingsPrefs
+}
+
+internal fun Context.widgetEntryPoint(): WidgetEntryPoint =
+    EntryPointAccessors.fromApplication(applicationContext, WidgetEntryPoint::class.java)

app/src/main/java/de/jeanlucmakiola/calendula/widget/WidgetTheme.kt

@@ -0,0 +1,36 @@
+package de.jeanlucmakiola.calendula.widget
+
+import android.os.Build
+import androidx.compose.runtime.Composable
+import androidx.glance.GlanceTheme
+import androidx.glance.material3.ColorProviders
+import de.jeanlucmakiola.calendula.ui.theme.CalendulaDarkFallback
+import de.jeanlucmakiola.calendula.ui.theme.CalendulaLightFallback
+
+/**
+ * Brand fallback for devices without Material You dynamic colour (API < 31).
+ * Reuses the exact same hand-tuned schemes as the in-app theme
+ * ([CalendulaLightFallback] / [CalendulaDarkFallback]) so a widget on an older
+ * device matches the app surface-for-surface.
+ */
+private val CalendulaGlanceColors = ColorProviders(
+    light = CalendulaLightFallback,
+    dark = CalendulaDarkFallback,
+)
+
+/**
+ * Glance equivalent of `CalendulaTheme`. On API 31+ it follows the system's
+ * Material You palette (so the widget matches the home screen / the app's
+ * dynamic colour); below that it falls back to the brand scheme. Either way the
+ * widget draws only from M3 colour-role tokens (`GlanceTheme.colors.*`) — never
+ * a hardcoded colour — so it tracks light/dark automatically.
+ */
+@Composable
+fun CalendulaGlanceTheme(content: @Composable () -> Unit) {
+    val colors = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+        GlanceTheme.colors
+    } else {
+        CalendulaGlanceColors
+    }
+    GlanceTheme(colors = colors, content = content)
+}

app/src/main/java/de/jeanlucmakiola/calendula/widget/WidgetUpdateReceiver.kt

@@ -0,0 +1,41 @@
+package de.jeanlucmakiola.calendula.widget
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import androidx.glance.appwidget.updateAll
+import de.jeanlucmakiola.calendula.widget.agenda.AgendaWidget
+import de.jeanlucmakiola.calendula.widget.month.MonthWidget
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.launch
+
+/**
+ * Redraws both home-screen widgets when their data goes stale. Triggered by:
+ *  - `PROVIDER_CHANGED` from the calendar provider — fires on any data change,
+ *    so it covers both the app's own writes and external sync.
+ *  - `DATE_CHANGED` / `TIME_SET` / `TIMEZONE_CHANGED` — so "today" highlighting
+ *    and the upcoming window roll over at midnight / on a clock change.
+ *
+ * Both widgets also carry an `updatePeriodMillis` backstop in their provider
+ * XML, and the month widget's refresh button forces an immediate redraw.
+ */
+class WidgetUpdateReceiver : BroadcastReceiver() {
+    override fun onReceive(context: Context, intent: Intent) {
+        val pending = goAsync()
+        val appContext = context.applicationContext
+        // Calendar data may have changed (sync / our own write) — drop the cached
+        // month window so the widgets reload fresh. Month paging does NOT call
+        // this, so arrow taps stay instant.
+        invalidateMonthWidgetCache()
+        CoroutineScope(SupervisorJob() + Dispatchers.IO).launch {
+            try {
+                AgendaWidget().updateAll(appContext)
+                MonthWidget().updateAll(appContext)
+            } finally {
+                pending.finish()
+            }
+        }
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/widget/agenda/AgendaWidget.kt

@@ -0,0 +1,279 @@
+package de.jeanlucmakiola.calendula.widget.agenda
+
+import android.content.Context
+import android.content.res.Configuration
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.glance.ColorFilter
+import androidx.glance.GlanceId
+import androidx.glance.GlanceModifier
+import androidx.glance.GlanceTheme
+import androidx.glance.Image
+import androidx.glance.ImageProvider
+import androidx.glance.action.ActionParameters
+import androidx.glance.action.clickable
+import androidx.glance.appwidget.GlanceAppWidget
+import androidx.glance.appwidget.action.ActionCallback
+import androidx.glance.appwidget.action.actionRunCallback
+import androidx.glance.appwidget.action.actionStartActivity
+import androidx.glance.appwidget.cornerRadius
+import androidx.glance.appwidget.lazy.LazyColumn
+import androidx.glance.appwidget.lazy.items
+import androidx.glance.appwidget.provideContent
+import androidx.glance.appwidget.updateAll
+import androidx.glance.background
+import androidx.glance.layout.Alignment
+import androidx.glance.layout.Box
+import androidx.glance.layout.Column
+import androidx.glance.layout.Row
+import androidx.glance.layout.Spacer
+import androidx.glance.layout.fillMaxSize
+import androidx.glance.layout.fillMaxWidth
+import androidx.glance.layout.height
+import androidx.glance.layout.padding
+import androidx.glance.layout.size
+import androidx.glance.layout.width
+import androidx.glance.text.FontWeight
+import androidx.glance.text.Text
+import androidx.glance.text.TextStyle
+import de.jeanlucmakiola.calendula.MainActivity
+import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.ui.common.pastelize
+import de.jeanlucmakiola.calendula.widget.AgendaWidgetData
+import de.jeanlucmakiola.calendula.widget.CalendulaGlanceTheme
+import de.jeanlucmakiola.calendula.widget.loadAgendaWidgetData
+import de.jeanlucmakiola.calendula.widget.systemZone
+import de.jeanlucmakiola.calendula.widget.today
+import kotlinx.datetime.DateTimeUnit
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.plus
+import kotlinx.datetime.toLocalDateTime
+import kotlin.time.Instant
+import java.time.format.TextStyle as JavaTextStyle
+import java.util.Locale
+
+/**
+ * "Upcoming" agenda widget — a continuously scrolling list of the next ~30 days
+ * of events grouped under day headers (the Google "Schedule" widget model).
+ * Reuses the app's [groupAgendaDays] grouping so it matches the in-app agenda.
+ */
+class AgendaWidget : GlanceAppWidget() {
+
+    override suspend fun provideGlance(context: Context, id: GlanceId) {
+        val data = context.loadAgendaWidgetData()
+        val dark = (context.resources.configuration.uiMode and
+            Configuration.UI_MODE_NIGHT_MASK) == Configuration.UI_MODE_NIGHT_YES
+        provideContent {
+            CalendulaGlanceTheme {
+                AgendaWidgetBody(data = data, dark = dark)
+            }
+        }
+    }
+}
+
+/** Re-reads the calendar and redraws the widget (header refresh button). */
+class RefreshAgendaAction : ActionCallback {
+    override suspend fun onAction(context: Context, glanceId: GlanceId, parameters: ActionParameters) {
+        AgendaWidget().updateAll(context.applicationContext)
+    }
+}
+
+/** Flat row model so the [LazyColumn] can mix day headers and events. */
+private sealed interface AgendaRow {
+    data class Header(val date: LocalDate, val today: LocalDate) : AgendaRow
+    data class Event(val event: EventInstance) : AgendaRow
+}
+
+@Composable
+private fun AgendaWidgetBody(data: AgendaWidgetData, dark: Boolean) {
+    Column(
+        modifier = GlanceModifier
+            .fillMaxSize()
+            .background(GlanceTheme.colors.surface)
+            .padding(horizontal = 8.dp, vertical = 6.dp),
+    ) {
+        AgendaHeader()
+        Spacer(GlanceModifier.height(4.dp))
+        when (data) {
+            AgendaWidgetData.NeedsPermission -> WidgetMessage(R.string.widget_needs_permission)
+            is AgendaWidgetData.Ready ->
+                if (data.days.isEmpty()) {
+                    WidgetMessage(R.string.agenda_empty_title)
+                } else {
+                    val rows = buildList {
+                        data.days.forEach { day ->
+                            add(AgendaRow.Header(day.date, data.today))
+                            day.events.forEach { add(AgendaRow.Event(it)) }
+                        }
+                    }
+                    LazyColumn(modifier = GlanceModifier.fillMaxSize()) {
+                        items(rows.size) { index ->
+                            when (val row = rows[index]) {
+                                is AgendaRow.Header -> DayHeaderRow(row.date, row.today)
+                                is AgendaRow.Event -> EventRow(row.event, dark)
+                            }
+                        }
+                    }
+                }
+        }
+    }
+}
+
+@Composable
+private fun AgendaHeader() {
+    val context = androidx.glance.LocalContext.current
+    Row(
+        modifier = GlanceModifier.fillMaxWidth().padding(horizontal = 4.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        Text(
+            text = context.getString(R.string.widget_agenda_title),
+            style = TextStyle(
+                color = GlanceTheme.colors.primary,
+                fontSize = 16.sp,
+                fontWeight = FontWeight.Medium,
+            ),
+            modifier = GlanceModifier.defaultWeight(),
+        )
+        IconButton(
+            resId = R.drawable.ic_widget_refresh,
+            contentDescription = context.getString(R.string.widget_refresh),
+            onClick = GlanceModifier.clickable(actionRunCallback<RefreshAgendaAction>()),
+        )
+        IconButton(
+            resId = R.drawable.ic_widget_add,
+            contentDescription = context.getString(R.string.widget_new_event),
+            onClick = GlanceModifier.clickable(
+                actionStartActivity(
+                    MainActivity.openCreateIntent(context, today(systemZone())),
+                ),
+            ),
+        )
+    }
+}
+
+@Composable
+private fun IconButton(resId: Int, contentDescription: String, onClick: GlanceModifier) {
+    Box(
+        modifier = GlanceModifier.size(40.dp).then(onClick),
+        contentAlignment = Alignment.Center,
+    ) {
+        Image(
+            provider = ImageProvider(resId),
+            contentDescription = contentDescription,
+            colorFilter = ColorFilter.tint(GlanceTheme.colors.onSurfaceVariant),
+            modifier = GlanceModifier.size(22.dp),
+        )
+    }
+}
+
+@Composable
+private fun DayHeaderRow(date: LocalDate, today: LocalDate) {
+    val context = androidx.glance.LocalContext.current
+    Text(
+        text = agendaDayLabel(context, date, today),
+        style = TextStyle(
+            color = if (date == today) GlanceTheme.colors.primary
+            else GlanceTheme.colors.onSurfaceVariant,
+            fontSize = 13.sp,
+            fontWeight = FontWeight.Medium,
+        ),
+        modifier = GlanceModifier
+            .fillMaxWidth()
+            .padding(start = 8.dp, end = 8.dp, top = 10.dp, bottom = 4.dp)
+            .clickable(actionStartActivity(MainActivity.openDateIntent(context, date))),
+    )
+}
+
+@Composable
+private fun EventRow(event: EventInstance, dark: Boolean) {
+    val context = androidx.glance.LocalContext.current
+    val title = event.title.ifBlank { context.getString(R.string.event_untitled) }
+    Row(
+        modifier = GlanceModifier
+            .fillMaxWidth()
+            .padding(horizontal = 4.dp, vertical = 4.dp)
+            .clickable(
+                actionStartActivity(
+                    MainActivity.eventDetailIntent(
+                        context = context,
+                        eventId = event.eventId,
+                        beginMillis = event.start.toEpochMilliseconds(),
+                        endMillis = event.end.toEpochMilliseconds(),
+                    ),
+                ),
+            ),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        Box(
+            modifier = GlanceModifier
+                .width(5.dp)
+                .height(36.dp)
+                .cornerRadius(3.dp)
+                .background(pastelize(event.color, dark)),
+        ) {}
+        Spacer(GlanceModifier.width(10.dp))
+        Column(modifier = GlanceModifier.defaultWeight()) {
+            Text(
+                text = title,
+                maxLines = 1,
+                style = TextStyle(color = GlanceTheme.colors.onSurface, fontSize = 14.sp),
+            )
+            Text(
+                text = eventTimeSummary(context, event),
+                maxLines = 1,
+                style = TextStyle(color = GlanceTheme.colors.onSurfaceVariant, fontSize = 12.sp),
+            )
+        }
+    }
+}
+
+@Composable
+private fun WidgetMessage(resId: Int) {
+    val context = androidx.glance.LocalContext.current
+    Box(
+        modifier = GlanceModifier.fillMaxSize().padding(16.dp),
+        contentAlignment = Alignment.Center,
+    ) {
+        Text(
+            text = context.getString(resId),
+            style = TextStyle(color = GlanceTheme.colors.onSurfaceVariant, fontSize = 14.sp),
+        )
+    }
+}
+
+private fun zone(): TimeZone = systemZone()
+
+/** "Today · Wed, 17 Jun" — relative word for today/tomorrow, else the date. */
+private fun agendaDayLabel(context: Context, date: LocalDate, today: LocalDate): String {
+    val relative = when (date) {
+        today -> context.getString(R.string.agenda_header_today)
+        today.plus(1, DateTimeUnit.DAY) -> context.getString(R.string.agenda_header_tomorrow)
+        else -> null
+    }
+    val locale = Locale.getDefault()
+    val java = java.time.LocalDate.of(date.year, date.month.ordinal + 1, date.day)
+    val weekday = java.dayOfWeek.getDisplayName(JavaTextStyle.SHORT, locale)
+    val monthName = java.month.getDisplayName(JavaTextStyle.SHORT, locale)
+    val formatted = "$weekday, ${date.day} $monthName"
+    return if (relative != null) "$relative · $formatted" else formatted
+}
+
+private fun eventTimeSummary(context: Context, event: EventInstance): String {
+    val time = if (event.isAllDay) {
+        context.getString(R.string.event_detail_all_day)
+    } else {
+        "${formatTime(event.start)} – ${formatTime(event.end)}"
+    }
+    val location = event.location?.takeIf { it.isNotBlank() }
+    return if (location != null) "$time · $location" else time
+}
+
+private fun formatTime(instant: Instant): String {
+    val t = instant.toLocalDateTime(zone()).time
+    return "%02d:%02d".format(t.hour, t.minute)
+}

app/src/main/java/de/jeanlucmakiola/calendula/widget/agenda/AgendaWidgetReceiver.kt

@@ -0,0 +1,13 @@
+package de.jeanlucmakiola.calendula.widget.agenda
+
+import androidx.glance.appwidget.GlanceAppWidget
+import androidx.glance.appwidget.GlanceAppWidgetReceiver
+
+/**
+ * Host-facing receiver for the agenda widget. Declared in the manifest with the
+ * `appwidget_info_agenda` provider metadata; delegates all rendering to
+ * [AgendaWidget].
+ */
+class AgendaWidgetReceiver : GlanceAppWidgetReceiver() {
+    override val glanceAppWidget: GlanceAppWidget = AgendaWidget()
+}

app/src/main/java/de/jeanlucmakiola/calendula/widget/month/MonthWidget.kt

@@ -0,0 +1,433 @@
+package de.jeanlucmakiola.calendula.widget.month
+
+import android.content.Context
+import android.content.res.Configuration
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.datastore.preferences.core.intPreferencesKey
+import androidx.glance.ColorFilter
+import androidx.glance.GlanceId
+import androidx.glance.GlanceModifier
+import androidx.glance.GlanceTheme
+import androidx.glance.Image
+import androidx.glance.ImageProvider
+import androidx.glance.LocalContext
+import androidx.glance.LocalSize
+import androidx.glance.action.ActionParameters
+import androidx.glance.action.actionParametersOf
+import androidx.glance.action.clickable
+import androidx.glance.appwidget.GlanceAppWidget
+import androidx.glance.appwidget.SizeMode
+import androidx.glance.appwidget.action.ActionCallback
+import androidx.glance.appwidget.action.actionRunCallback
+import androidx.glance.appwidget.action.actionStartActivity
+import androidx.glance.appwidget.cornerRadius
+import androidx.glance.appwidget.provideContent
+import androidx.glance.appwidget.state.updateAppWidgetState
+import androidx.glance.appwidget.updateAll
+import androidx.glance.background
+import androidx.glance.currentState
+import androidx.glance.layout.Alignment
+import androidx.glance.layout.Box
+import androidx.glance.layout.Column
+import androidx.glance.layout.Row
+import androidx.glance.layout.Spacer
+import androidx.glance.layout.fillMaxSize
+import androidx.glance.layout.fillMaxWidth
+import androidx.glance.layout.height
+import androidx.glance.layout.padding
+import androidx.glance.layout.size
+import androidx.glance.layout.width
+import androidx.glance.state.PreferencesGlanceStateDefinition
+import androidx.glance.text.FontWeight
+import androidx.glance.text.Text
+import androidx.glance.text.TextAlign
+import androidx.glance.text.TextStyle
+import androidx.glance.unit.ColorProvider
+import de.jeanlucmakiola.calendula.MainActivity
+import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.ui.common.pastelize
+import de.jeanlucmakiola.calendula.ui.month.MonthWeek
+import de.jeanlucmakiola.calendula.ui.month.layoutMonthWeeks
+import de.jeanlucmakiola.calendula.widget.CalendulaGlanceTheme
+import de.jeanlucmakiola.calendula.widget.MonthWidgetSource
+import de.jeanlucmakiola.calendula.widget.loadMonthWidgetSource
+import de.jeanlucmakiola.calendula.widget.systemZone
+import de.jeanlucmakiola.calendula.widget.today
+import androidx.compose.ui.unit.Dp
+import kotlinx.datetime.DayOfWeek
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.Month
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.YearMonth
+import java.time.format.TextStyle as JavaTextStyle
+import java.util.Locale
+
+/** Per-widget state: the displayed month as `year * 12 + monthOrdinal`. */
+private val MONTH_INDEX_KEY = intPreferencesKey("month_index")
+
+/** Event rows (lanes) shown per week before the rest collapse into "+N". */
+private const val MAX_LANES = 3
+private val LANE_HEIGHT = 14.dp
+private val DAY_NUMBER_HEIGHT = 18.dp
+private val GRID_HPADDING = 8.dp
+
+/** Dark ink that reads on the pastelized event fills, like the in-app MonthBar. */
+private val EventInk = ColorProvider(Color(0xDE000000))
+
+private fun currentMonthIndex(zone: TimeZone): Int {
+    val t = today(zone)
+    return t.year * 12 + t.month.ordinal
+}
+
+private fun yearMonthOf(index: Int): YearMonth =
+    YearMonth(index / 12, Month(index % 12 + 1))
+
+/**
+ * Month-grid widget: a 6×7 calendar with today highlighted, connected multi-day
+ * event bars and titled single-day pills (the in-app lane layout via
+ * [layoutMonthWeeks]), and prev/next/today navigation.
+ *
+ * Columns are sized explicitly from [LocalSize] (hence [SizeMode.Exact]) so a
+ * multi-day span renders as a single Box spanning its columns — connected, no
+ * inter-cell seam, with rounded end caps. The displayed month lives in Glance
+ * state and is read reactively in the composition ([currentState]) so the arrows
+ * move it via plain recomposition, not a (here-unreliable) widget session reload.
+ */
+class MonthWidget : GlanceAppWidget() {
+
+    override val stateDefinition = PreferencesGlanceStateDefinition
+    override val sizeMode = SizeMode.Exact
+
+    override suspend fun provideGlance(context: Context, id: GlanceId) {
+        val source = context.loadMonthWidgetSource()
+        val dark = (context.resources.configuration.uiMode and
+            Configuration.UI_MODE_NIGHT_MASK) == Configuration.UI_MODE_NIGHT_YES
+        provideContent {
+            CalendulaGlanceTheme {
+                MonthWidgetBody(source = source, dark = dark)
+            }
+        }
+    }
+}
+
+/** Step the displayed month by the `delta` action parameter (±1). */
+class ShiftMonthAction : ActionCallback {
+    override suspend fun onAction(context: Context, glanceId: GlanceId, parameters: ActionParameters) {
+        val delta = parameters[deltaKey] ?: 0
+        updateAppWidgetState(context, glanceId) { prefs ->
+            val cur = prefs[MONTH_INDEX_KEY] ?: currentMonthIndex(systemZone())
+            prefs[MONTH_INDEX_KEY] = cur + delta
+        }
+        MonthWidget().updateAll(context.applicationContext)
+    }
+
+    companion object {
+        val deltaKey = ActionParameters.Key<Int>("delta")
+    }
+}
+
+/** Jump the displayed month back to the current month. */
+class ResetMonthAction : ActionCallback {
+    override suspend fun onAction(context: Context, glanceId: GlanceId, parameters: ActionParameters) {
+        updateAppWidgetState(context, glanceId) { prefs -> prefs.remove(MONTH_INDEX_KEY) }
+        MonthWidget().updateAll(context.applicationContext)
+    }
+}
+
+@Composable
+private fun MonthWidgetBody(source: MonthWidgetSource, dark: Boolean) {
+    Column(
+        modifier = GlanceModifier
+            .fillMaxSize()
+            .background(GlanceTheme.colors.surface)
+            .padding(horizontal = GRID_HPADDING, vertical = 6.dp),
+    ) {
+        when (source) {
+            MonthWidgetSource.NeedsPermission -> {
+                MonthHeader(label = "Calendula")
+                PermissionMessage()
+            }
+            is MonthWidgetSource.Ready -> {
+                val zone = systemZone()
+                val index = currentState(MONTH_INDEX_KEY) ?: currentMonthIndex(zone)
+                val ym = yearMonthOf(index)
+                // Column width from the live widget size, minus our H padding.
+                val colW = (LocalSize.current.width - GRID_HPADDING * 2) / 7
+                val weeks = layoutMonthWeeks(ym, source.weekStart, source.instances, zone)
+
+                MonthHeader(label = monthLabel(ym))
+                Spacer(GlanceModifier.height(2.dp))
+                WeekdayHeader(weekStart = source.weekStart, colW = colW)
+                weeks.forEach { week ->
+                    WeekRow(
+                        week = week,
+                        currentMonth = ym.month,
+                        today = source.today,
+                        dark = dark,
+                        colW = colW,
+                        modifier = GlanceModifier.defaultWeight(),
+                    )
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun MonthHeader(label: String) {
+    val context = LocalContext.current
+    Row(
+        modifier = GlanceModifier.fillMaxWidth(),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        HeaderIcon(
+            resId = R.drawable.ic_widget_chevron_left,
+            contentDescription = context.getString(R.string.widget_prev_month),
+            onClick = GlanceModifier.clickable(
+                actionRunCallback<ShiftMonthAction>(
+                    actionParametersOf(ShiftMonthAction.deltaKey to -1),
+                ),
+            ),
+        )
+        Text(
+            text = label,
+            style = TextStyle(
+                color = GlanceTheme.colors.primary,
+                fontSize = 15.sp,
+                fontWeight = FontWeight.Medium,
+                textAlign = TextAlign.Center,
+            ),
+            modifier = GlanceModifier
+                .defaultWeight()
+                .clickable(actionRunCallback<ResetMonthAction>()),
+        )
+        HeaderIcon(
+            resId = R.drawable.ic_widget_today,
+            contentDescription = context.getString(R.string.widget_today),
+            onClick = GlanceModifier.clickable(
+                actionStartActivity(MainActivity.openDateIntent(context, today(systemZone()))),
+            ),
+        )
+        HeaderIcon(
+            resId = R.drawable.ic_widget_chevron_right,
+            contentDescription = context.getString(R.string.widget_next_month),
+            onClick = GlanceModifier.clickable(
+                actionRunCallback<ShiftMonthAction>(
+                    actionParametersOf(ShiftMonthAction.deltaKey to 1),
+                ),
+            ),
+        )
+    }
+}
+
+@Composable
+private fun HeaderIcon(resId: Int, contentDescription: String, onClick: GlanceModifier) {
+    Box(
+        modifier = GlanceModifier.size(40.dp).then(onClick),
+        contentAlignment = Alignment.Center,
+    ) {
+        Image(
+            provider = ImageProvider(resId),
+            contentDescription = contentDescription,
+            colorFilter = ColorFilter.tint(GlanceTheme.colors.onSurfaceVariant),
+            modifier = GlanceModifier.size(20.dp),
+        )
+    }
+}
+
+@Composable
+private fun WeekdayHeader(weekStart: DayOfWeek, colW: Dp) {
+    Row(modifier = GlanceModifier.fillMaxWidth()) {
+        weekdayNarrowNames(weekStart).forEach { name ->
+            Text(
+                text = name,
+                style = TextStyle(
+                    color = GlanceTheme.colors.onSurfaceVariant,
+                    fontSize = 11.sp,
+                    textAlign = TextAlign.Center,
+                ),
+                modifier = GlanceModifier.width(colW),
+            )
+        }
+    }
+}
+
+/** Narrow weekday initials starting at [weekStart], in the device locale.
+ * Computed outside the composable so the locale read stays observable-safe. */
+private fun weekdayNarrowNames(weekStart: DayOfWeek): List<String> {
+    val locale = Locale.getDefault()
+    return (0 until 7).map { i ->
+        java.time.DayOfWeek.of((weekStart.ordinal + i) % 7 + 1)
+            .getDisplayName(JavaTextStyle.NARROW, locale)
+    }
+}
+
+@Composable
+private fun WeekRow(
+    week: MonthWeek,
+    currentMonth: Month,
+    today: LocalDate,
+    dark: Boolean,
+    colW: Dp,
+    modifier: GlanceModifier,
+) {
+    Column(modifier = modifier.fillMaxWidth()) {
+        // Day numbers.
+        Row(modifier = GlanceModifier.fillMaxWidth()) {
+            week.days.forEach { date ->
+                DayNumber(
+                    date = date,
+                    isToday = date == today,
+                    inMonth = date.month == currentMonth,
+                    colW = colW,
+                )
+            }
+        }
+        Spacer(GlanceModifier.height(2.dp))
+        // One lane row per event row. A multi-day span is a single Box spanning
+        // its columns (colW * n) so it's connected with no seam and rounded ends.
+        repeat(MAX_LANES) { lane ->
+            LaneRow(week = week, lane = lane, dark = dark, colW = colW)
+            Spacer(GlanceModifier.height(1.dp))
+        }
+        OverflowRow(week = week, colW = colW)
+    }
+}
+
+@Composable
+private fun DayNumber(date: LocalDate, isToday: Boolean, inMonth: Boolean, colW: Dp) {
+    Box(
+        modifier = GlanceModifier.width(colW).height(DAY_NUMBER_HEIGHT),
+        contentAlignment = Alignment.Center,
+    ) {
+        Box(
+            modifier = GlanceModifier
+                .size(DAY_NUMBER_HEIGHT)
+                .then(if (isToday) GlanceModifier.cornerRadius(DAY_NUMBER_HEIGHT / 2).background(GlanceTheme.colors.primary) else GlanceModifier),
+            contentAlignment = Alignment.Center,
+        ) {
+            Text(
+                text = date.day.toString(),
+                style = TextStyle(
+                    color = when {
+                        isToday -> GlanceTheme.colors.onPrimary
+                        inMonth -> GlanceTheme.colors.onSurface
+                        else -> GlanceTheme.colors.onSurfaceVariant
+                    },
+                    fontSize = 11.sp,
+                    fontWeight = if (isToday) FontWeight.Bold else FontWeight.Normal,
+                ),
+            )
+        }
+    }
+}
+
+@Composable
+private fun LaneRow(week: MonthWeek, lane: Int, dark: Boolean, colW: Dp) {
+    Row(modifier = GlanceModifier.fillMaxWidth()) {
+        var col = 0
+        while (col < 7) {
+            val span = week.spans.firstOrNull { it.lane == lane && col in it.startCol..it.endCol }
+            if (span != null) {
+                val cols = span.endCol - col + 1
+                SpanBar(event = span.event, dark = dark, width = colW * cols)
+                col = span.endCol + 1
+            } else {
+                val timed = timedEventAt(week, lane, col, week.days[col])
+                if (timed != null) {
+                    SpanBar(event = timed, dark = dark, width = colW)
+                } else {
+                    Box(GlanceModifier.width(colW).height(LANE_HEIGHT)) {}
+                }
+                col += 1
+            }
+        }
+    }
+}
+
+/** A single connected, rounded event bar [width] wide with its clipped title. */
+@Composable
+private fun SpanBar(event: EventInstance, dark: Boolean, width: Dp) {
+    val context = LocalContext.current
+    Box(modifier = GlanceModifier.width(width).height(LANE_HEIGHT).padding(horizontal = 1.dp)) {
+        Box(
+            modifier = GlanceModifier
+                .fillMaxSize()
+                .cornerRadius(4.dp)
+                .background(pastelize(event.color, dark)),
+            contentAlignment = Alignment.CenterStart,
+        ) {
+            Text(
+                text = event.title.ifBlank { context.getString(R.string.event_untitled) },
+                maxLines = 1,
+                style = TextStyle(color = EventInk, fontSize = 9.sp),
+                modifier = GlanceModifier.padding(horizontal = 3.dp),
+            )
+        }
+    }
+}
+
+@Composable
+private fun OverflowRow(week: MonthWeek, colW: Dp) {
+    Row(modifier = GlanceModifier.fillMaxWidth()) {
+        week.days.forEachIndexed { col, date ->
+            val shownSpans = week.spans.count { col in it.startCol..it.endCol && it.lane < MAX_LANES }
+            val freeSlots = (MAX_LANES - shownSpans).coerceAtLeast(0)
+            val timedShown = minOf(freeSlots, week.timedByDay[date].orEmpty().size)
+            val hidden = (week.countByDay[date] ?: 0) - shownSpans - timedShown
+            Box(
+                modifier = GlanceModifier.width(colW).height(LANE_HEIGHT),
+                contentAlignment = Alignment.CenterStart,
+            ) {
+                if (hidden > 0) {
+                    Text(
+                        text = "+$hidden",
+                        maxLines = 1,
+                        style = TextStyle(color = GlanceTheme.colors.onSurfaceVariant, fontSize = 9.sp),
+                        modifier = GlanceModifier.padding(start = 3.dp),
+                    )
+                }
+            }
+        }
+    }
+}
+
+/** The timed single-day event that fills lane [lane] on day [col], if any. */
+private fun timedEventAt(week: MonthWeek, lane: Int, col: Int, date: LocalDate): EventInstance? {
+    val occupied = week.spans
+        .filter { col in it.startCol..it.endCol && it.lane < MAX_LANES }
+        .map { it.lane }
+        .toSet()
+    val freeSlots = (0 until MAX_LANES).filter { it !in occupied }
+    val timed = week.timedByDay[date].orEmpty()
+    return timed.getOrNull(freeSlots.indexOf(lane))
+}
+
+@Composable
+private fun PermissionMessage() {
+    val context = LocalContext.current
+    Box(
+        modifier = GlanceModifier.fillMaxSize().padding(16.dp),
+        contentAlignment = Alignment.Center,
+    ) {
+        Text(
+            text = context.getString(R.string.widget_needs_permission),
+            style = TextStyle(
+                color = GlanceTheme.colors.onSurfaceVariant,
+                fontSize = 14.sp,
+                textAlign = TextAlign.Center,
+            ),
+        )
+    }
+}
+
+private fun monthLabel(month: YearMonth): String {
+    val locale = Locale.getDefault()
+    val name = java.time.Month.of(month.month.ordinal + 1)
+        .getDisplayName(JavaTextStyle.FULL, locale)
+    return "$name ${month.year}"
+}

app/src/main/java/de/jeanlucmakiola/calendula/widget/month/MonthWidgetReceiver.kt

@@ -0,0 +1,12 @@
+package de.jeanlucmakiola.calendula.widget.month
+
+import androidx.glance.appwidget.GlanceAppWidget
+import androidx.glance.appwidget.GlanceAppWidgetReceiver
+
+/**
+ * Host-facing receiver for the month widget. Declared in the manifest with the
+ * `appwidget_info_month` provider metadata; delegates rendering to [MonthWidget].
+ */
+class MonthWidgetReceiver : GlanceAppWidgetReceiver() {
+    override val glanceAppWidget: GlanceAppWidget = MonthWidget()
+}

app/src/main/res/drawable/ic_gitea.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Gitea brand mark, used on the "Source" button in Settings → About.
+    Single-path logo from Simple Icons (https://simpleicons.org, CC0),
+    pathData kept verbatim so Android's PathParser reads the arc flags.
+    fillColor is a placeholder; the Compose Icon recolours it via tint.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M4.209 4.603c-.247 0-.525.02-.84.088-.333.07-1.28.283-2.054 1.027C-.403 7.25.035 9.685.089 10.052c.065.446.263 1.687 1.21 2.768 1.749 2.141 5.513 2.092 5.513 2.092s.462 1.103 1.168 2.119c.955 1.263 1.936 2.248 2.89 2.367 2.406 0 7.212-.004 7.212-.004s.458.004 1.08-.394c.535-.324 1.013-.893 1.013-.893s.492-.527 1.18-1.73c.21-.37.385-.729.538-1.068 0 0 2.107-4.471 2.107-8.823-.042-1.318-.367-1.55-.443-1.627-.156-.156-.366-.153-.366-.153s-4.475.252-6.792.306c-.508.011-1.012.023-1.512.027v4.474l-.634-.301c0-1.39-.004-4.17-.004-4.17-1.107.016-3.405-.084-3.405-.084s-5.399-.27-5.987-.324c-.187-.011-.401-.032-.648-.032zm.354 1.832h.111s.271 2.269.6 3.597C5.549 11.147 6.22 13 6.22 13s-.996-.119-1.641-.348c-.99-.324-1.409-.714-1.409-.714s-.73-.511-1.096-1.52C1.444 8.73 2.021 7.7 2.021 7.7s.32-.859 1.47-1.145c.395-.106.863-.12 1.072-.12zm8.33 2.554c.26.003.509.127.509.127l.868.422-.529 1.075a.686.686 0 0 0-.614.359.685.685 0 0 0 .072.756l-.939 1.924a.69.69 0 0 0-.66.527.687.687 0 0 0 .347.763.686.686 0 0 0 .867-.206.688.688 0 0 0-.069-.882l.916-1.874a.667.667 0 0 0 .237-.02.657.657 0 0 0 .271-.137 8.826 8.826 0 0 1 1.016.512.761.761 0 0 1 .286.282c.073.21-.073.569-.073.569-.087.29-.702 1.55-.702 1.55a.692.692 0 0 0-.676.477.681.681 0 1 0 1.157-.252c.073-.141.141-.282.214-.431.19-.397.515-1.16.515-1.16.035-.066.218-.394.103-.814-.095-.435-.48-.638-.48-.638-.467-.301-1.116-.58-1.116-.58s0-.156-.042-.27a.688.688 0 0 0-.148-.241l.516-1.062 2.89 1.401s.48.218.583.619c.073.282-.019.534-.069.657-.24.587-2.1 4.317-2.1 4.317s-.232.554-.748.588a1.065 1.065 0 0 1-.393-.045l-.202-.08-4.31-2.1s-.417-.218-.49-.596c-.083-.31.104-.691.104-.691l2.073-4.272s.183-.37.466-.497a.855.855 0 0 1 .35-.077z" />
+</vector>

app/src/main/res/drawable/ic_shortcut_new_event.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Launcher long-press shortcut icon ("New event"): a brand-coloured circle
+     with a white calendar+plus glyph, as one scalable vector. Self-contained so
+     it stays visible on any launcher surface (shortcut icons aren't tinted, so a
+     bare white glyph would vanish on a light sheet). -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="48dp"
+    android:height="48dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#3B5364"
+        android:pathData="M0,12 a12,12 0 1,0 24,0 a12,12 0 1,0 -24,0 Z" />
+    <group
+        android:scaleX="0.58"
+        android:scaleY="0.58"
+        android:translateX="5"
+        android:translateY="5">
+        <path
+            android:fillColor="@android:color/white"
+            android:pathData="M19,3h-1V1h-2v2H8V1H6v2H5C3.89,3 3.01,3.9 3.01,5L3,19c0,1.1 0.89,2 2,2h14c1.1,0 2,-0.9 2,-2V5C21,3.9 20.1,3 19,3zM19,19H5V8h14V19z" />
+        <path
+            android:fillColor="@android:color/white"
+            android:pathData="M11.5,10.5h1v2h2v1h-2v2h-1v-2h-2v-1h2z" />
+    </group>
+</vector>

app/src/main/res/drawable/ic_widget_add.xml

@@ -0,0 +1,6 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp" android:height="24dp"
+    android:viewportWidth="24" android:viewportHeight="24">
+    <path android:fillColor="@android:color/white"
+        android:pathData="M19,13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/>
+</vector>

app/src/main/res/drawable/ic_widget_chevron_left.xml

@@ -0,0 +1,6 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp" android:height="24dp"
+    android:viewportWidth="24" android:viewportHeight="24">
+    <path android:fillColor="@android:color/white"
+        android:pathData="M15.41,7.41L14,6l-6,6 6,6 1.41,-1.41L10.83,12z"/>
+</vector>

app/src/main/res/drawable/ic_widget_chevron_right.xml

@@ -0,0 +1,6 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp" android:height="24dp"
+    android:viewportWidth="24" android:viewportHeight="24">
+    <path android:fillColor="@android:color/white"
+        android:pathData="M10,6L8.59,7.41 13.17,12l-4.58,4.59L10,18l6,-6z"/>
+</vector>

app/src/main/res/drawable/ic_widget_refresh.xml

@@ -0,0 +1,6 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp" android:height="24dp"
+    android:viewportWidth="24" android:viewportHeight="24">
+    <path android:fillColor="@android:color/white"
+        android:pathData="M17.65,6.35C16.2,4.9 14.21,4 12,4c-4.42,0 -7.99,3.58 -7.99,8s3.57,8 7.99,8c3.73,0 6.84,-2.55 7.73,-6h-2.08c-0.82,2.33 -3.04,4 -5.65,4 -3.31,0 -6,-2.69 -6,-6s2.69,-6 6,-6c1.66,0 3.14,0.69 4.22,1.78L13,11h7V4l-2.35,2.35z"/>
+</vector>

app/src/main/res/drawable/ic_widget_today.xml

@@ -0,0 +1,6 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp" android:height="24dp"
+    android:viewportWidth="24" android:viewportHeight="24">
+    <path android:fillColor="@android:color/white"
+        android:pathData="M19,3h-1V1h-2v2H8V1H6v2H5C3.89,3 3.01,3.9 3.01,5L3,19c0,1.1 0.89,2 2,2h14c1.1,0 2,-0.9 2,-2V5c0,-1.1 -0.9,-2 -2,-2zM19,19H5V8h14v11zM7,10h5v5H7z"/>
+</vector>

app/src/main/res/drawable/preview_stripe.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="#4F7CAC" />
+    <corners android:radius="3dp" />
+</shape>

app/src/main/res/drawable/preview_today_circle.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+    <solid android:color="@color/widget_preview_primary" />
+</shape>

app/src/main/res/drawable/preview_widget_bg.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="@color/widget_preview_surface" />
+    <corners android:radius="20dp" />
+</shape>

app/src/main/res/layout/widget_preview_agenda.xml

@@ -0,0 +1,124 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Static mock shown in the widget picker (android:previewLayout). Not the
+     runtime layout — the live widget is rendered by Glance. Colours are the
+     brand light scheme so the picker preview reads on its light sheet. -->
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:background="@drawable/preview_widget_bg"
+    android:padding="14dp">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/widget_agenda_title"
+        android:textColor="@color/widget_preview_primary"
+        android:textSize="15sp"
+        android:textStyle="bold" />
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        android:text="@string/agenda_header_today"
+        android:textColor="@color/widget_preview_primary"
+        android:textSize="12sp"
+        android:textStyle="bold" />
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="10dp"
+        android:orientation="horizontal"
+        android:gravity="center_vertical">
+        <ImageView
+            android:layout_width="5dp"
+            android:layout_height="34dp"
+            android:contentDescription="@null"
+            android:background="@drawable/preview_stripe"
+            android:backgroundTint="#4F7CAC" />
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="10dp"
+            android:orientation="vertical">
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:text="Standup"
+                android:textColor="@color/widget_preview_on_surface"
+                android:textSize="14sp" />
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:text="09:00 – 09:30"
+                android:textColor="@color/widget_preview_variant"
+                android:textSize="12sp" />
+        </LinearLayout>
+    </LinearLayout>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        android:orientation="horizontal"
+        android:gravity="center_vertical">
+        <ImageView
+            android:layout_width="5dp"
+            android:layout_height="34dp"
+            android:contentDescription="@null"
+            android:background="@drawable/preview_stripe"
+            android:backgroundTint="#6FA37A" />
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="10dp"
+            android:orientation="vertical">
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:text="Design review"
+                android:textColor="@color/widget_preview_on_surface"
+                android:textSize="14sp" />
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:text="11:30 – 12:30"
+                android:textColor="@color/widget_preview_variant"
+                android:textSize="12sp" />
+        </LinearLayout>
+    </LinearLayout>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        android:orientation="horizontal"
+        android:gravity="center_vertical">
+        <ImageView
+            android:layout_width="5dp"
+            android:layout_height="34dp"
+            android:contentDescription="@null"
+            android:background="@drawable/preview_stripe"
+            android:backgroundTint="#C58A56" />
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="10dp"
+            android:orientation="vertical">
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:text="1:1 with Mara"
+                android:textColor="@color/widget_preview_on_surface"
+                android:textSize="14sp" />
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:text="14:00 – 14:30"
+                android:textColor="@color/widget_preview_variant"
+                android:textSize="12sp" />
+        </LinearLayout>
+    </LinearLayout>
+</LinearLayout>

app/src/main/res/layout/widget_preview_month.xml

@@ -0,0 +1,114 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Static mock shown in the widget picker (android:previewLayout). The live
+     widget is rendered by Glance with real events; this only needs to read as
+     "a month grid" in the picker. -->
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:background="@drawable/preview_widget_bg"
+    android:padding="12dp">
+
+    <!-- Header -->
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        android:gravity="center_vertical">
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="‹"
+            android:textColor="@color/widget_preview_variant"
+            android:textSize="16sp" />
+        <TextView
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:gravity="center"
+            android:text="June 2026"
+            android:textColor="@color/widget_preview_primary"
+            android:textSize="15sp"
+            android:textStyle="bold" />
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="›"
+            android:textColor="@color/widget_preview_variant"
+            android:textSize="16sp" />
+    </LinearLayout>
+
+    <!-- Weekday header -->
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="6dp"
+        android:orientation="horizontal">
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="M" android:textColor="@color/widget_preview_variant" android:textSize="11sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="T" android:textColor="@color/widget_preview_variant" android:textSize="11sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="W" android:textColor="@color/widget_preview_variant" android:textSize="11sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="T" android:textColor="@color/widget_preview_variant" android:textSize="11sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="F" android:textColor="@color/widget_preview_variant" android:textSize="11sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="S" android:textColor="@color/widget_preview_variant" android:textSize="11sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="S" android:textColor="@color/widget_preview_variant" android:textSize="11sp" />
+    </LinearLayout>
+
+    <!-- Week 1: 1..7 (event bar on the 3rd) -->
+    <LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:orientation="horizontal" android:layout_marginTop="4dp">
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="1" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="2" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="3" android:textColor="#4F7CAC" android:textStyle="bold" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="4" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="5" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="6" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="7" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+    </LinearLayout>
+
+    <!-- Week 2: 8..14 (bars on 11,12,13) -->
+    <LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:orientation="horizontal" android:layout_marginTop="4dp">
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="8" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="9" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="10" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="11" android:textColor="#6FA37A" android:textStyle="bold" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="12" android:textColor="#6FA37A" android:textStyle="bold" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="13" android:textColor="#6FA37A" android:textStyle="bold" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="14" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+    </LinearLayout>
+
+    <!-- Week 3: 15..21 (17 = today) -->
+    <LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:orientation="horizontal" android:layout_marginTop="4dp">
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="15" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="16" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:orientation="horizontal">
+            <TextView android:layout_width="22dp" android:layout_height="22dp" android:gravity="center"
+                android:text="17" android:textColor="@color/widget_preview_on_primary" android:textStyle="bold" android:textSize="12sp"
+                android:background="@drawable/preview_today_circle" />
+        </LinearLayout>
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="18" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="19" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="20" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="21" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+    </LinearLayout>
+
+    <!-- Week 4: 22..28 (bar on 24) -->
+    <LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:orientation="horizontal" android:layout_marginTop="4dp">
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="22" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="23" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="24" android:textColor="#C58A56" android:textStyle="bold" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="25" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="26" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="27" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="28" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+    </LinearLayout>
+
+    <!-- Week 5: 29, 30, then trailing July days greyed -->
+    <LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:orientation="horizontal" android:layout_marginTop="4dp">
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="29" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="30" android:textColor="@color/widget_preview_on_surface" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="1" android:textColor="@color/widget_preview_variant" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="2" android:textColor="@color/widget_preview_variant" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="3" android:textColor="@color/widget_preview_variant" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="4" android:textColor="@color/widget_preview_variant" android:textSize="12sp" />
+        <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="5" android:textColor="@color/widget_preview_variant" android:textSize="12sp" />
+    </LinearLayout>
+</LinearLayout>

app/src/main/res/values-de/strings.xml

@@ -47,6 +47,9 @@
     <string name="event_detail_back">Zurück</string>
     <string name="event_detail_edit">Bearbeiten</string>
     <string name="event_detail_delete">Löschen</string>
+    <string name="event_detail_share">Teilen</string>
+    <string name="event_share_chooser_title">Termin teilen</string>
+    <string name="event_share_failed">Termin konnte nicht geteilt werden.</string>
     <string name="event_delete_title">Termin löschen?</string>
     <string name="event_delete_body">Der Termin wird aus deinem Kalender und von allen synchronisierten Geräten entfernt.</string>
     <string name="event_delete_recurring_title">Wiederkehrenden Termin löschen</string>
@@ -82,6 +85,15 @@
     <string name="event_edit_availability">Verfügbarkeit</string>
     <string name="event_edit_visibility">Sichtbarkeit</string>
 
+    <!-- Termin-Formular — eigene Terminfarbe -->
+    <string name="event_edit_color">Farbe</string>
+    <string name="event_edit_color_default">Kalenderfarbe</string>
+    <string name="event_edit_color_custom">Eigene Farbe</string>
+    <string name="event_edit_color_reset">Zurücksetzen</string>
+    <string name="event_edit_color_unsupported">Für diesen Kalender nicht verfügbar</string>
+    <string name="event_edit_color_unsupported_hint">Dieser Kalender stellt keine Farbpalette bereit. Du kannst eigene Farben für solche Kalender in den Einstellungen aktivieren.</string>
+    <string name="event_edit_color_sync_warning">Dieser Kalender verwirft oder überschreibt die Farbe unter Umständen bei der nächsten Synchronisierung.</string>
+
     <!-- Termin-Formular — Speicher-Konflikt (v2.0) -->
     <string name="event_edit_conflict_title">Termin wurde extern geändert</string>
     <string name="event_edit_conflict_body">Während du bearbeitet hast, wurde dieser Termin anderswo geändert — durch Synchronisierung oder eine andere App. Was soll mit deinen Änderungen passieren?</string>
@@ -187,8 +199,34 @@
     <string name="view_month">Monat</string>
     <string name="view_week">Woche</string>
     <string name="view_day">Tag</string>
+    <string name="view_agenda">Agenda</string>
     <string name="view_section">Ansicht</string>
 
+    <!-- Zu Datum springen (Navigationsleiste) -->
+    <string name="drawer_jump_to_date">Zu Datum springen</string>
+
+    <!-- Agenda-Ansicht -->
+    <string name="agenda_today_action">Heute</string>
+    <string name="agenda_header_today">Heute</string>
+    <string name="agenda_header_tomorrow">Morgen</string>
+    <string name="agenda_empty_title">Nichts geplant</string>
+    <string name="agenda_empty_subtitle">Anstehende Termine erscheinen hier.</string>
+
+    <!-- Startbildschirm-Widgets -->
+    <string name="widget_agenda_title">Anstehend</string>
+    <string name="widget_agenda_label">Calendula Agenda</string>
+    <string name="widget_month_label">Calendula Monat</string>
+    <string name="widget_refresh">Aktualisieren</string>
+    <string name="widget_new_event">Neuer Termin</string>
+    <string name="widget_needs_permission">Öffne Calendula, um Kalenderzugriff zu erlauben</string>
+    <string name="widget_prev_month">Vorheriger Monat</string>
+    <string name="widget_next_month">Nächster Monat</string>
+    <string name="widget_today">Heute</string>
+
+    <!-- Verknüpfungen (Long-Press auf das App-Symbol) -->
+    <string name="shortcut_new_event_short">Neuer Termin</string>
+    <string name="shortcut_new_event_long">Neuen Termin erstellen</string>
+
     <!-- Kalender-Filter (M3) -->
     <string name="filter_title">Kalender</string>
 
@@ -208,18 +246,95 @@
     <string name="settings_week_start_sunday">Sonntag</string>
     <string name="settings_section_event_form">Termin-Formular</string>
     <string name="settings_form_fields_hint">Standardmäßig angezeigte Felder — alles Weitere liegt hinter \"Weitere Felder\"</string>
+    <string name="settings_color_unsupported">Farben auf nicht unterstützten Kalendern erlauben</string>
+    <string name="settings_color_unsupported_hint">Manche Kalender (z. B. bestimmte CalDAV) stellen keine Farbpalette bereit; eine eigene Terminfarbe wird dort bei der nächsten Synchronisierung unter Umständen verworfen oder überschrieben. Das ist eine Einschränkung dieser Kalender und kann von Calendula nicht behoben werden.</string>
     <string name="settings_section_notifications">Benachrichtigungen</string>
     <string name="settings_reminders">Termin-Erinnerungen</string>
     <string name="settings_reminders_hint">Erinnerungen doppelt? Eine andere Kalender-App zeigt sie ebenfalls — schalte sie in einer der beiden ab.</string>
+    <string name="settings_default_reminder">Standard-Erinnerung</string>
+    <string name="settings_default_reminder_allday">Ganztägige Termine</string>
+    <string name="settings_allday_reminder_time">Uhrzeit für ganztägige Erinnerungen</string>
+    <string name="settings_allday_reminder_time_hint">Erinnerungen für ganztägige Termine werden um %1$s ausgelöst</string>
+    <string name="reminder_none">Keine</string>
+    <string name="reminder_use_default">Standard-Erinnerung verwenden</string>
+    <string name="reminder_custom_amount">Anzahl</string>
+    <string name="reminder_custom_with_value">Benutzerdefiniert (%1$s)</string>
+    <string name="reminder_custom_set">Übernehmen</string>
+    <string name="settings_calendar_reminders_hint">Standard pro Kalender überschreiben — getrennt für Termine mit Uhrzeit und ganztägige Termine. Ein Kalender kann den Standard übernehmen, weglassen oder einen eigenen festlegen.</string>
+    <string name="settings_calendar_reminder_inherits">Standard (%1$s)</string>
+    <string name="settings_reliable_delivery">Zuverlässige Zustellung</string>
+    <string name="settings_reliable_delivery_hint">Android verzögert Erinnerungen womöglich, um Akku zu sparen. Nimm Calendula aus, damit sie pünktlich ankommen.</string>
+    <string name="settings_reliable_delivery_exempt">Von der Akku-Optimierung ausgenommen — Erinnerungen kommen pünktlich.</string>
+    <string name="settings_section_calendars">Kalender</string>
+    <string name="settings_manage_calendars">Kalender verwalten</string>
+    <string name="settings_manage_calendars_hint">Lokale Kalender anlegen, synchronisierte verwalten</string>
     <string name="settings_section_language">Sprache</string>
     <string name="settings_language">App-Sprache</string>
     <string name="settings_language_auto">Systemstandard</string>
-    <string name="settings_language_german">Deutsch</string>
-    <string name="settings_language_english">English</string>
+    <!-- Hub category subtitles -->
+    <string name="settings_appearance_subtitle">Design, dynamische Farben, Wochenstart</string>
+    <string name="settings_event_form_subtitle">Standardfelder für neue Termine</string>
+    <string name="settings_notifications_subtitle">Termin-Erinnerungen</string>
     <string name="settings_section_about">Über</string>
-    <string name="settings_version">Version</string>
     <string name="settings_license">Lizenz</string>
     <string name="settings_license_value">MIT</string>
-    <string name="settings_source">Quellcode</string>
-    <string name="settings_source_open">Öffnen</string>
+    <string name="settings_about_author">von Jean-Luc Makiola</string>
+    <string name="settings_about_source">Quellcode</string>
+    <string name="settings_about_version">Version %1$s</string>
+    <string name="settings_about_logo_desc">Calendula-App-Symbol</string>
+
+    <!-- Calendar manager -->
+    <string name="calendars_title">Kalender</string>
+    <string name="calendars_local_header">Deine Kalender</string>
+    <string name="calendars_local_empty">Noch keine lokalen Kalender. Lege einen an, um Termine nur auf diesem Gerät zu speichern.</string>
+    <string name="calendars_add">Kalender hinzufügen</string>
+    <string name="calendars_synced_header">Synchronisierte Kalender</string>
+    <string name="calendars_synced_hint">Diese stammen von Konten auf deinem Gerät. Erstelle und bearbeite sie in der jeweiligen App.</string>
+    <string name="calendars_manage_in_app">Verwalten</string>
+    <string name="calendars_add_account">Konto hinzufügen</string>
+    <string name="calendars_new_title">Neuer Kalender</string>
+    <string name="calendars_edit_title">Kalender bearbeiten</string>
+    <string name="calendars_name_label">Name</string>
+    <string name="calendars_color_label">Farbe</string>
+    <string name="calendars_description_hint">Beschreibung hinzufügen</string>
+    <string name="calendars_delete_confirm_title">Kalender löschen?</string>
+    <string name="calendars_delete_confirm_message">\"%1$s\" und alle zugehörigen Termine werden dauerhaft von diesem Gerät entfernt.</string>
+    <string name="calendars_write_error">Änderung konnte nicht gespeichert werden.</string>
+    <!-- Backup (whole-calendar .ics export) -->
+    <string name="calendars_backup_header">Sicherung</string>
+    <string name="calendars_backup_hint">Lokale Kalender werden nirgends synchronisiert – exportiere sie als .ics-Datei, um eine Kopie zu behalten.</string>
+    <string name="calendars_backup_action">Als .ics-Datei exportieren</string>
+    <string name="calendars_backup_failed">Sicherung konnte nicht exportiert werden.</string>
+    <plurals name="calendars_backup_done">
+        <item quantity="one">%d Termin exportiert.</item>
+        <item quantity="other">%d Termine exportiert.</item>
+    </plurals>
+    <!-- Import (.ics) -->
+    <string name="import_title">Termine importieren</string>
+    <string name="import_target_header">Zu Kalender hinzufügen</string>
+    <string name="import_empty">In dieser Datei wurden keine Termine gefunden.</string>
+    <string name="import_failed">Datei konnte nicht gelesen werden.</string>
+    <string name="import_no_calendar">Kein beschreibbarer Kalender zum Importieren. Lege zuerst einen lokalen Kalender an.</string>
+    <string name="import_done_title">Import abgeschlossen</string>
+    <string name="import_close">Schließen</string>
+    <string name="import_warning_recurrence">Einige geänderte Einzeltermine wiederkehrender Termine wurden übersprungen.</string>
+    <string name="import_warning_no_start">Ein Termin ohne Startzeit wurde übersprungen.</string>
+    <string name="import_warning_attendees">Gästelisten wurden nicht importiert.</string>
+    <string name="import_warning_timezone">Eine unbekannte Zeitzone wurde durch die deines Geräts ersetzt.</string>
+    <plurals name="import_event_count">
+        <item quantity="one">%d Termin in dieser Datei.</item>
+        <item quantity="other">%d Termine in dieser Datei.</item>
+    </plurals>
+    <plurals name="import_action">
+        <item quantity="one">%d Termin importieren</item>
+        <item quantity="other">%d Termine importieren</item>
+    </plurals>
+    <plurals name="import_done_imported">
+        <item quantity="one">%d Termin importiert.</item>
+        <item quantity="other">%d Termine importiert.</item>
+    </plurals>
+    <plurals name="import_done_skipped">
+        <item quantity="one">%d bereits in diesem Kalender übersprungen.</item>
+        <item quantity="other">%d bereits in diesem Kalender übersprungen.</item>
+    </plurals>
 </resources>

app/src/main/res/values-night-v31/widget_preview_colors.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="widget_preview_surface">@android:color/system_neutral1_900</color>
+    <color name="widget_preview_on_surface">@android:color/system_neutral1_50</color>
+    <color name="widget_preview_variant">@android:color/system_neutral2_200</color>
+    <color name="widget_preview_primary">@android:color/system_accent1_200</color>
+    <color name="widget_preview_on_primary">@android:color/system_accent1_800</color>
+</resources>

app/src/main/res/values-night/colors.xml

@@ -0,0 +1,6 @@
+<resources>
+    <!-- Dark-scheme window backdrop, matching the Compose dark background/surface
+         (#101316) so activity recreation (e.g. language switch) doesn't flash a
+         lighter grey. See values/colors.xml. -->
+    <color name="window_background">#FF101316</color>
+</resources>

app/src/main/res/values-night/widget_preview_colors.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="widget_preview_surface">#101316</color>
+    <color name="widget_preview_on_surface">#E1E3E6</color>
+    <color name="widget_preview_variant">#A8ADB2</color>
+    <color name="widget_preview_primary">#A3CBE2</color>
+    <color name="widget_preview_on_primary">#003348</color>
+</resources>

app/src/main/res/values-v31/widget_preview_colors.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="widget_preview_surface">@android:color/system_neutral1_50</color>
+    <color name="widget_preview_on_surface">@android:color/system_neutral1_900</color>
+    <color name="widget_preview_variant">@android:color/system_neutral2_700</color>
+    <color name="widget_preview_primary">@android:color/system_accent1_600</color>
+    <color name="widget_preview_on_primary">@android:color/system_accent1_0</color>
+</resources>

app/src/main/res/values/colors.xml

@@ -3,4 +3,8 @@
     <color name="seed">#FF5C6B7A</color>
     <!-- Adaptive icon background -->
     <color name="ic_launcher_background">#FF5C6B7A</color>
+    <!-- Window backdrop shown during activity recreation (e.g. on a language
+         switch). Matches the Compose light scheme background/surface so the
+         recreation is seamless; overridden for dark in values-night. -->
+    <color name="window_background">#FFFBFCFE</color>
 </resources>

app/src/main/res/values/strings.xml

@@ -48,6 +48,9 @@
     <string name="event_detail_back">Back</string>
     <string name="event_detail_edit">Edit</string>
     <string name="event_detail_delete">Delete</string>
+    <string name="event_detail_share">Share</string>
+    <string name="event_share_chooser_title">Share event</string>
+    <string name="event_share_failed">Couldn\'t share this event.</string>
     <string name="event_delete_title">Delete event?</string>
     <string name="event_delete_body">The event is removed from your calendar and from every device it syncs to.</string>
     <string name="event_delete_recurring_title">Delete recurring event</string>
@@ -83,6 +86,15 @@
     <string name="event_edit_availability">Availability</string>
     <string name="event_edit_visibility">Visibility</string>
 
+    <!-- Event form — per-event color -->
+    <string name="event_edit_color">Color</string>
+    <string name="event_edit_color_default">Calendar color</string>
+    <string name="event_edit_color_custom">Custom color</string>
+    <string name="event_edit_color_reset">Reset</string>
+    <string name="event_edit_color_unsupported">Not available for this calendar</string>
+    <string name="event_edit_color_unsupported_hint">This calendar publishes no color set. You can allow custom colors for such calendars in Settings.</string>
+    <string name="event_edit_color_sync_warning">This calendar may drop or overwrite the color on its next sync.</string>
+
     <!-- Event form — save conflict (v2.0) -->
     <string name="event_edit_conflict_title">Event changed elsewhere</string>
     <string name="event_edit_conflict_body">While you were editing, this event was changed — by sync or another app. What should happen to your changes?</string>
@@ -188,8 +200,30 @@
     <string name="view_month">Month</string>
     <string name="view_week">Week</string>
     <string name="view_day">Day</string>
+    <string name="view_agenda">Agenda</string>
     <string name="view_section">View</string>
 
+    <!-- Jump to date (drawer) -->
+    <string name="drawer_jump_to_date">Jump to date</string>
+
+    <!-- Agenda view -->
+    <string name="agenda_today_action">Today</string>
+    <string name="agenda_header_today">Today</string>
+    <string name="agenda_header_tomorrow">Tomorrow</string>
+    <string name="agenda_empty_title">Nothing scheduled</string>
+    <string name="agenda_empty_subtitle">Upcoming events will show up here.</string>
+
+    <!-- Home-screen widgets -->
+    <string name="widget_agenda_title">Upcoming</string>
+    <string name="widget_agenda_label">Calendula agenda</string>
+    <string name="widget_month_label">Calendula month</string>
+    <string name="widget_refresh">Refresh</string>
+    <string name="widget_new_event">New event</string>
+    <string name="widget_needs_permission">Open Calendula to grant calendar access</string>
+    <string name="widget_prev_month">Previous month</string>
+    <string name="widget_next_month">Next month</string>
+    <string name="widget_today">Today</string>
+
     <!-- Calendar filter (M3) -->
     <string name="filter_title">Calendars</string>
 
@@ -209,19 +243,101 @@
     <string name="settings_week_start_sunday">Sunday</string>
     <string name="settings_section_event_form">New event form</string>
     <string name="settings_form_fields_hint">Fields shown by default — everything else sits behind \"More fields\"</string>
+    <string name="settings_color_unsupported">Allow colors on unsupported calendars</string>
+    <string name="settings_color_unsupported_hint">Some calendars (e.g. certain CalDAV) publish no color set; a custom event color may be dropped or overwritten on their next sync. That\'s a limitation of those calendars, not something Calendula can fix.</string>
     <string name="settings_section_notifications">Notifications</string>
     <string name="settings_reminders">Event reminders</string>
     <string name="settings_reminders_hint">Seeing reminders twice? Another calendar app is posting them too — turn them off in one of the two.</string>
+    <string name="settings_default_reminder">Default reminder</string>
+    <string name="settings_default_reminder_allday">All-day events</string>
+    <string name="settings_allday_reminder_time">All-day reminder time</string>
+    <string name="settings_allday_reminder_time_hint">Reminders for all-day events fire at %1$s</string>
+    <string name="reminder_none">None</string>
+    <string name="reminder_use_default">Use default reminder</string>
+    <string name="reminder_custom_amount">Amount</string>
+    <string name="reminder_custom_with_value">Custom (%1$s)</string>
+    <string name="reminder_custom_set">Set</string>
+    <string name="settings_calendar_reminders_hint">Override the default per calendar — separately for timed and all-day events. A calendar can keep the default, drop it, or set its own.</string>
+    <string name="settings_calendar_reminder_inherits">Default (%1$s)</string>
+    <string name="settings_reliable_delivery">Reliable delivery</string>
+    <string name="settings_reliable_delivery_hint">Android may delay reminders to save battery. Exempt Calendula so they arrive on time.</string>
+    <string name="settings_reliable_delivery_exempt">Exempt from battery optimisation — reminders arrive on time.</string>
+    <string name="settings_section_calendars">Calendars</string>
+    <string name="settings_manage_calendars">Manage calendars</string>
+    <string name="settings_manage_calendars_hint">Create local calendars; manage synced ones</string>
     <string name="settings_section_language">Language</string>
     <string name="settings_language">App language</string>
     <string name="settings_language_auto">System default</string>
-    <string name="settings_language_german">Deutsch</string>
-    <string name="settings_language_english">English</string>
+    <!-- Hub category subtitles -->
+    <string name="settings_appearance_subtitle">Theme, dynamic colour, week start</string>
+    <string name="settings_event_form_subtitle">Default fields for new events</string>
+    <string name="settings_notifications_subtitle">Event reminders</string>
     <string name="settings_section_about">About</string>
-    <string name="settings_version">Version</string>
     <string name="settings_license">License</string>
     <string name="settings_license_value">MIT</string>
-    <string name="settings_source">Source code</string>
-    <string name="settings_source_open">Open</string>
+    <string name="settings_about_author">by Jean-Luc Makiola</string>
+    <string name="settings_about_source">Source</string>
+    <string name="settings_about_version">Version %1$s</string>
+    <string name="settings_about_logo_desc">Calendula app icon</string>
+
+    <!-- Calendar manager -->
+    <string name="calendars_title">Calendars</string>
+    <string name="calendars_local_header">Your calendars</string>
+    <string name="calendars_local_empty">No local calendars yet. Create one to keep events on this device only.</string>
+    <string name="calendars_add">Add calendar</string>
+    <string name="calendars_synced_header">Synced calendars</string>
+    <string name="calendars_synced_hint">These come from accounts on your device. Create and edit them in their own app.</string>
+    <string name="calendars_manage_in_app">Manage</string>
+    <string name="calendars_add_account">Add account</string>
+    <string name="calendars_new_title">New calendar</string>
+    <string name="calendars_edit_title">Edit calendar</string>
+    <string name="calendars_name_label">Name</string>
+    <string name="calendars_color_label">Color</string>
+    <string name="calendars_description_hint">Add a description</string>
+    <string name="calendars_delete_confirm_title">Delete calendar?</string>
+    <string name="calendars_delete_confirm_message">\"%1$s\" and all of its events will be permanently removed from this device.</string>
+    <string name="calendars_write_error">Couldn\'t save the change.</string>
+    <!-- Backup (whole-calendar .ics export) -->
+    <string name="calendars_backup_header">Backup</string>
+    <string name="calendars_backup_hint">Local calendars aren\'t synced anywhere, so export them to an .ics file to keep a copy.</string>
+    <string name="calendars_backup_action">Export as .ics file</string>
+    <string name="calendars_backup_failed">Couldn\'t export the backup.</string>
+    <plurals name="calendars_backup_done">
+        <item quantity="one">Exported %d event.</item>
+        <item quantity="other">Exported %d events.</item>
+    </plurals>
+    <!-- Import (.ics) -->
+    <string name="import_title">Import events</string>
+    <string name="import_target_header">Add to calendar</string>
+    <string name="import_empty">No events found in this file.</string>
+    <string name="import_failed">Couldn\'t read this file.</string>
+    <string name="import_no_calendar">No writable calendar to import into. Create a local calendar first.</string>
+    <string name="import_done_title">Import complete</string>
+    <string name="import_close">Close</string>
+    <string name="import_warning_recurrence">Some changed occurrences of recurring events were skipped.</string>
+    <string name="import_warning_no_start">An event without a start time was skipped.</string>
+    <string name="import_warning_attendees">Guest lists weren\'t imported.</string>
+    <string name="import_warning_timezone">An unknown time zone fell back to your device\'s.</string>
+    <plurals name="import_event_count">
+        <item quantity="one">%d event in this file.</item>
+        <item quantity="other">%d events in this file.</item>
+    </plurals>
+    <plurals name="import_action">
+        <item quantity="one">Import %d event</item>
+        <item quantity="other">Import %d events</item>
+    </plurals>
+    <plurals name="import_done_imported">
+        <item quantity="one">Imported %d event.</item>
+        <item quantity="other">Imported %d events.</item>
+    </plurals>
+    <plurals name="import_done_skipped">
+        <item quantity="one">Skipped %d already in this calendar.</item>
+        <item quantity="other">Skipped %d already in this calendar.</item>
+    </plurals>
+    <!-- Launcher long-press shortcuts -->
+    <string name="shortcut_new_event_short">New event</string>
+    <string name="shortcut_new_event_long">Create a new event</string>
+
     <string name="about_source_url" translatable="false">https://gitea.jeanlucmakiola.de/makiolaj/calendula</string>
+    <string name="about_license_url" translatable="false">https://gitea.jeanlucmakiola.de/makiolaj/calendula/src/branch/main/LICENSE</string>
 </resources>

app/src/main/res/values/themes.xml

@@ -1,5 +1,10 @@
 <resources xmlns:tools="http://schemas.android.com/tools">
-    <style name="Theme.Calendula" parent="android:Theme.Material.Light.NoActionBar">
+    <!-- AppCompat (DayNight) parent so MainActivity can be an AppCompatActivity,
+         which is required for AppCompatDelegate.setApplicationLocales (the in-app
+         language picker) to sync to the system. Actual colours are driven by the
+         Compose theme; this is essentially the launch/backdrop theme. -->
+    <style name="Theme.Calendula" parent="Theme.AppCompat.DayNight.NoActionBar">
+        <item name="android:windowBackground">@color/window_background</item>
         <item name="android:statusBarColor">@android:color/transparent</item>
         <item name="android:navigationBarColor">@android:color/transparent</item>
         <item name="android:windowLightStatusBar">true</item>

app/src/main/res/values/widget_preview_colors.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Colours for the static widget-picker previews. Base = brand light fallback
+     (API < 31). values-v31 maps them to the Material You dynamic palette so the
+     preview matches the live Glance widget; -night holds the dark variants. -->
+<resources>
+    <color name="widget_preview_surface">#FBFCFE</color>
+    <color name="widget_preview_on_surface">#191C1F</color>
+    <color name="widget_preview_variant">#6E7479</color>
+    <color name="widget_preview_primary">#3B5364</color>
+    <color name="widget_preview_on_primary">#FFFFFF</color>
+</resources>

app/src/main/res/xml/appwidget_info_agenda.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
+    android:minWidth="180dp"
+    android:minHeight="150dp"
+    android:targetCellWidth="3"
+    android:targetCellHeight="3"
+    android:minResizeWidth="110dp"
+    android:minResizeHeight="110dp"
+    android:resizeMode="horizontal|vertical"
+    android:widgetCategory="home_screen"
+    android:description="@string/widget_agenda_label"
+    android:updatePeriodMillis="1800000"
+    android:previewLayout="@layout/widget_preview_agenda"
+    android:initialLayout="@layout/glance_default_loading_layout" />

app/src/main/res/xml/appwidget_info_month.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
+    android:minWidth="250dp"
+    android:minHeight="180dp"
+    android:targetCellWidth="4"
+    android:targetCellHeight="4"
+    android:minResizeWidth="180dp"
+    android:minResizeHeight="150dp"
+    android:resizeMode="horizontal|vertical"
+    android:widgetCategory="home_screen"
+    android:description="@string/widget_month_label"
+    android:updatePeriodMillis="1800000"
+    android:previewLayout="@layout/widget_preview_month"
+    android:initialLayout="@layout/glance_default_loading_layout" />

app/src/main/res/xml/file_paths.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Exposes the cache subdirectory where IcsExporter stages files for sharing. -->
+<paths>
+    <cache-path
+        name="shared_ics"
+        path="shared_ics/" />
+</paths>

app/src/main/res/xml/locales_config.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    The languages Calendula ships translations for. This is the single source of
+    truth: each entry must have a matching res/values-<tag>/strings.xml, and is
+    surfaced automatically in both the in-app language picker (parsed at runtime
+    by AppLanguage) and the system per-app language settings (Android 13+, via
+    android:localeConfig in the manifest). To add a community translation, drop
+    in the values-<tag> folder and add one <locale> line here.
+-->
+<locale-config xmlns:android="http://schemas.android.com/apk/res/android">
+    <locale android:name="en" />
+    <locale android:name="de" />
+</locale-config>

app/src/main/res/xml/shortcuts.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Launcher long-press shortcuts. The intent fires a custom action that
+     MainActivity (singleTop) consumes to open the create-event form on today;
+     see MainActivity.ACTION_NEW_EVENT. -->
+<shortcuts xmlns:android="http://schemas.android.com/apk/res/android">
+    <shortcut
+        android:shortcutId="new_event"
+        android:enabled="true"
+        android:icon="@drawable/ic_shortcut_new_event"
+        android:shortcutShortLabel="@string/shortcut_new_event_short"
+        android:shortcutLongLabel="@string/shortcut_new_event_long">
+        <intent
+            android:action="de.jeanlucmakiola.calendula.action.NEW_EVENT"
+            android:targetPackage="de.jeanlucmakiola.calendula"
+            android:targetClass="de.jeanlucmakiola.calendula.MainActivity" />
+    </shortcut>
+</shortcuts>

app/src/test/java/de/jeanlucmakiola/calendula/data/calendar/AllDayReminderEncodingTest.kt

@@ -0,0 +1,97 @@
+package de.jeanlucmakiola.calendula.data.calendar
+
+import com.google.common.truth.Truth.assertThat
+import org.junit.jupiter.api.Test
+import java.time.LocalDate
+import java.time.LocalTime
+import java.time.ZoneId
+import java.time.ZoneOffset
+
+class AllDayReminderEncodingTest {
+
+    private val berlin: ZoneId = ZoneId.of("Europe/Berlin")
+    private val nineAm = 9 * 60
+    private val summer = LocalDate.of(2026, 6, 20) // CEST, UTC+2
+    private val winter = LocalDate.of(2026, 1, 20) // CET, UTC+1
+
+    /** The instant the provider would actually fire: DTSTART(UTC midnight) − raw. */
+    private fun actualFire(rawMinutes: Int, startDate: LocalDate): Long =
+        startDate.atStartOfDay(ZoneOffset.UTC).toInstant().toEpochMilli() -
+            rawMinutes * 60_000L
+
+    /** The wall-clock instant we intend: [time] local, [daysBefore] days before [startDate]. */
+    private fun intendedFire(startDate: LocalDate, daysBefore: Int, timeMinutes: Int): Long =
+        startDate.minusDays(daysBefore.toLong())
+            .atTime(LocalTime.of(timeMinutes / 60, timeMinutes % 60))
+            .atZone(berlin).toInstant().toEpochMilli()
+
+    @Test
+    fun `one day before at 9am fires at 9am local the day before (summer)`() {
+        val raw = toProviderAllDayMinutes(1_440, summer, berlin, nineAm)
+        assertThat(actualFire(raw, summer)).isEqualTo(intendedFire(summer, 1, nineAm))
+        // 09:00 CEST is 07:00Z, 7h later than the bare midnight offset: 1440 − 420.
+        assertThat(raw).isEqualTo(1_020)
+    }
+
+    @Test
+    fun `one day before at 9am fires at 9am local the day before (winter)`() {
+        val raw = toProviderAllDayMinutes(1_440, winter, berlin, nineAm)
+        assertThat(actualFire(raw, winter)).isEqualTo(intendedFire(winter, 1, nineAm))
+        // 09:00 CET is 08:00Z, 8h later than midnight: 1440 − 480.
+        assertThat(raw).isEqualTo(960)
+    }
+
+    @Test
+    fun `at time of event encodes a negative offset firing 9am on the day (summer)`() {
+        val raw = toProviderAllDayMinutes(0, summer, berlin, nineAm)
+        assertThat(raw).isLessThan(0) // fires after DTSTART; must not be clamped
+        assertThat(actualFire(raw, summer)).isEqualTo(intendedFire(summer, 0, nineAm))
+    }
+
+    @Test
+    fun `round-trips for whole-day lead times across both seasons`() {
+        for (date in listOf(summer, winter)) {
+            for (time in listOf(0, nineAm, 20 * 60)) {
+                for (semantic in listOf(0, 1_440, 2_880, 10_080)) {
+                    val raw = toProviderAllDayMinutes(semantic, date, berlin, time)
+                    assertThat(fromProviderAllDayMinutes(raw, date, berlin)).isEqualTo(semantic)
+                }
+            }
+        }
+    }
+
+    @Test
+    fun `pre-feature rows (raw multiple of 1440) still decode to whole days`() {
+        // Reminders written before this feature stored raw N*1440 (fired at UTC
+        // midnight). They must still read back as "N days before".
+        assertThat(fromProviderAllDayMinutes(1_440, summer, berlin)).isEqualTo(1_440)
+        assertThat(fromProviderAllDayMinutes(1_440, winter, berlin)).isEqualTo(1_440)
+        assertThat(fromProviderAllDayMinutes(2_880, summer, berlin)).isEqualTo(2_880)
+    }
+
+    @Test
+    fun `decoding is independent of the time-of-day used to encode`() {
+        val atNine = toProviderAllDayMinutes(1_440, summer, berlin, nineAm)
+        val atEight = toProviderAllDayMinutes(1_440, summer, berlin, 8 * 60)
+        assertThat(atNine).isNotEqualTo(atEight)
+        assertThat(fromProviderAllDayMinutes(atNine, summer, berlin)).isEqualTo(1_440)
+        assertThat(fromProviderAllDayMinutes(atEight, summer, berlin)).isEqualTo(1_440)
+    }
+
+    @Test
+    fun `negative semantic minutes (provider-default sentinel) pass through`() {
+        assertThat(toProviderAllDayMinutes(-1, summer, berlin, nineAm)).isEqualTo(-1)
+    }
+
+    @Test
+    fun `a winter-anchored offset drifts one hour on a summer occurrence`() {
+        // Known limitation: one fixed MINUTES per series can't track DST. An
+        // offset tuned for a CET anchor fires an hour off once the series crosses
+        // into CEST. Bounded to ±1h; documented, not fixed.
+        val raw = toProviderAllDayMinutes(1_440, winter, berlin, nineAm)
+        val summerOccurrence = LocalDate.of(2026, 7, 20)
+        val fire = actualFire(raw, summerOccurrence).let(java.time.Instant::ofEpochMilli)
+            .atZone(berlin).toLocalTime()
+        assertThat(fire).isEqualTo(LocalTime.of(10, 0)) // 09:00 intended, +1h in CEST
+    }
+}