release: cut v1.2.1 — event-form polish

Version bumped to 1.2.1 / 10. No code changes beyond the version — 1.2.1 is
the reviewed-and-approved form polish: card design system, optional fields
with settings defaults, reworked reminders, OptionCard dialogs app-wide,
expressive theme on standard springs, direction-aware today jump, IME fix.
CHANGELOG [1.2.1] carries the details.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitea/workflows/ci.yaml

@@ -6,7 +6,11 @@ on:
       - '**'
     tags-ignore:
       - '**'
-  pull_request:
+
+# Cancel superseded runs on the same branch.
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
   ci:
@@ -26,30 +30,25 @@ jobs:
 
       - name: Setup Android SDK
         uses: android-actions/setup-android@v3
+        with:
+          # Default ("tools platform-tools") drags in the Android Emulator
+          # (~300 MB) which the build never uses.
+          packages: ''
+
+      - name: Setup Android SDK cache
+        uses: actions/cache@v4
+        with:
+          path: /opt/android-sdk
+          key: ${{ runner.os }}-android-sdk-37-36.0.0
 
       - name: Install Android SDK packages
         run: |
           yes | sdkmanager --licenses >/dev/null || true
           sdkmanager \
             "platform-tools" \
-            "platforms;android-36" \
             "platforms;android-37.0" \
             "build-tools;36.0.0"
 
-      - name: Install jq
-        run: |
-          set -e
-          SUDO=""
-          if command -v sudo >/dev/null 2>&1; then
-            SUDO="sudo"
-          fi
-          if command -v apt-get >/dev/null 2>&1; then
-            $SUDO apt-get update
-            $SUDO apt-get install -y jq
-          elif command -v apk >/dev/null 2>&1; then
-            $SUDO apk add --no-cache jq
-          fi
-
       - name: Setup Gradle cache
         uses: actions/cache@v4
         with:
@@ -63,16 +62,19 @@ jobs:
       - name: Grant execute permission for gradlew
         run: chmod +x ./gradlew
 
+      # No --no-daemon: the daemon lives only as long as this job container
+      # and lets the following steps skip JVM startup + reconfiguration.
       - name: Lint (debug variant only)
-        run: ./gradlew lintDebug --no-daemon
+        run: ./gradlew lintDebug
 
       - name: Unit tests
-        run: ./gradlew testDebugUnitTest --no-daemon
+        run: ./gradlew testDebugUnitTest
 
       - name: Assemble debug APK
-        run: ./gradlew assembleDebug --no-daemon
+        run: ./gradlew assembleDebug
 
       - name: Trivy filesystem scan
+        if: github.ref == 'refs/heads/main'
         run: |
           set -e
           SUDO=""

.gitea/workflows/release.yaml

@@ -24,16 +24,33 @@ jobs:
 
       - name: Setup Android SDK
         uses: android-actions/setup-android@v3
+        with:
+          packages: ''
+
+      - name: Setup Android SDK cache
+        uses: actions/cache@v4
+        with:
+          path: /opt/android-sdk
+          key: ${{ runner.os }}-android-sdk-37-36.0.0
 
       - name: Install Android SDK packages
         run: |
           yes | sdkmanager --licenses >/dev/null || true
           sdkmanager \
             "platform-tools" \
-            "platforms;android-36" \
             "platforms;android-37.0" \
             "build-tools;36.0.0"
 
+      - name: Setup Gradle cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties', 'gradle/libs.versions.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+
       - name: Grant execute permission for gradlew
         run: chmod +x ./gradlew
 
@@ -42,10 +59,10 @@ jobs:
       # any tag-resolved drift (e.g. version code substitution issues).
 
       - name: Unit tests
-        run: ./gradlew testDebugUnitTest --no-daemon
+        run: ./gradlew testDebugUnitTest
 
       - name: Assemble debug APK (sanity)
-        run: ./gradlew assembleDebug --no-daemon
+        run: ./gradlew assembleDebug
 
   build-and-deploy:
     needs: ci
@@ -65,16 +82,33 @@ jobs:
 
       - name: Setup Android SDK
         uses: android-actions/setup-android@v3
+        with:
+          packages: ''
+
+      - name: Setup Android SDK cache
+        uses: actions/cache@v4
+        with:
+          path: /opt/android-sdk
+          key: ${{ runner.os }}-android-sdk-37-36.0.0
 
       - name: Install Android SDK packages
         run: |
           yes | sdkmanager --licenses >/dev/null || true
           sdkmanager \
             "platform-tools" \
-            "platforms;android-36" \
             "platforms;android-37.0" \
             "build-tools;36.0.0"
 
+      - name: Setup Gradle cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties', 'gradle/libs.versions.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+
       - name: Install jq
         run: |
           set -e
@@ -121,7 +155,7 @@ jobs:
         run: chmod +x ./gradlew
 
       - name: Build release APK
-        run: ./gradlew assembleRelease --no-daemon
+        run: ./gradlew assembleRelease
 
       - name: Setup F-Droid Server Tools
         run: |

.planning/REQUIREMENTS.md

@@ -17,7 +17,7 @@ See full design spec: `docs/superpowers/specs/2026-06-08-calendar-app-design.md`
 - [ ] Day view (S3)
 - [ ] Event Detail Sheet (S4)
 - [ ] Multi-Calendar Filter (M3)
-- [ ] Today button + Jump-to-Date (M2)
+- [x] Today button (M2) — shipped v0.5; Jump-to-Date **cut from scope**
 - [ ] View-Switcher (M1)
 - [ ] Settings screen (M4)
 - [ ] Empty / no-permission / no-calendars states

.planning/ROADMAP.md

@@ -6,21 +6,66 @@
 |---|---|---|
 | v0.1 | Foundation & CI | complete |
 | v0.2 | Data Layer & Permission Flow | complete |
-| v0.3 | Month view | in progress |
+| v0.3 | Month + Week + Day views, view switcher | complete |
-| v0.4 | Week view | in progress |
+| v0.4 | Event Detail (S4) + humanized recurrence | complete |
-| v0.5 | Day view | pending |
+| v0.5 | Calendar filter (M3) + Settings (M4) | complete |
-| v0.6 | Event Detail Sheet | pending |
+| v0.6 | Full event read — surface every readable field | complete |
-| v0.7 | Filter & Settings | pending |
+| v1.0 | First public release — polish pass, F-Droid | complete |
 
-## v1.0 — First Public Release
+Delivery ran ahead of the original table: Day view (S3) shipped in v0.3 and
+Event Detail (S4) in v0.4, so the Filter/Settings milestone became v0.5.
 
-All V1 features shipped, polished, on F-Droid. Read-only calendar.
+Jump-to-date (the date-picker half of M2) was **cut from scope** and will not
+ship. The "Today" half of M2 already shipped in v0.5 (drawer entry).
 
-## v2.0 — Write Support
+## v0.6 — Full event read
 
-- Event create / edit / delete via `CalendarContract` writes
+Round out the read-only model so a detail view shows everything the system
-- Quick-add sheet
+actually stores, before write support starts. Scope = `CalendarContract`
-- Conflict UX (event modified externally during edit)
+columns we don't yet read/display:
+
+- **Reminders** (`VALARM`) — read `CalendarContract.Reminders`, list lead times
+- **Status** — Confirmed / Tentative / Cancelled (cancelled shown struck-through)
+- **Availability** (`TRANSP`) — Free / Busy chip
+- **Attendee extras** — role (required / optional / organizer) + the user's own
+  `SELF_ATTENDEE_STATUS`
+- **Timezone** (`EVENT_TIMEZONE`) — shown only when it differs from the device zone
+- **URL** — ~~tappable link card~~ **cut**: `CalendarContract` exposes no
+  `Events.URL` column (only `CUSTOM_APP_URI`, an originating-app deep-link).
+  URLs are instead surfaced by linkifying the description text
+- **Access level / class** (private / confidential) — small chip (optional, trivial)
+
+All of the above shipped in v0.6.0 (2026-06-11).
+
+Deliberately out of v0.6:
+- Recurrence exception / modified-occurrence badges — `Instances` already
+  resolves correct per-occurrence times for display; this only matters for
+  editing, so it folds into v2
+- `CATEGORIES`, `ATTACH` — not reliably exposed by `CalendarContract`
+  (provider limitation, not our choice)
+
+## v1.0 — First Public Release — shipped 2026-06-11
+
+All V1 features shipped, polished, on F-Droid. Read-only calendar. Cut directly
+after v0.6 (full event read) plus the onboarding-screen polish pass.
+
+### Polish backlog (pre-1.0)
+- ~~Redesign the initial grant-access (permission) screen~~ — **done**
+  (Material 3 Expressive onboarding, shipped in v0.6.0 / v1.0.0)
+
+## v2.0 — Write Support (in progress)
+
+Delivered in four releasable slices (plan:
+`docs/superpowers/plans/2026-06-11-03-write-support.md`). The V1 spec is a
+guide here, not a contract — scope per slice is decided as we go.
+
+| Version | Milestone | Status |
+|---|---|---|
+| v1.1 | Write foundation — `WRITE_CALENDAR`, read-only-calendar detection, delete (series + single occurrence) | complete (shipped 2026-06-11) |
+| v1.2 | Create event — form, FAB, last-used-calendar preselect | complete (shipped 2026-06-11) |
+| v1.2.1 | Form polish after on-device review — card design system, optional fields + settings defaults, OptionCard dialogs, expressive motion | complete (shipped 2026-06-11) |
+| v1.3 | Edit event — shared form, series edit, reminders, simple recurrence picker | planned |
+| v2.0 | Quick-add, occurrence edit, conflict dialog, polish, release | planned |
 
 ## v3.0 — Power-User Features
 

.planning/STATE.md

@@ -1,12 +1,15 @@
 # Calendula — Current State
 
-*Last updated: 2026-06-10*
+*Last updated: 2026-06-11*
 
 ## Status
 
-**Milestone:** v0.4 — Week view (in progress)
+**Milestone:** v2.0 — Write support (milestone 2, in progress)
-**Phase:** Month + Week views implemented; cross-cutting wiring (detail sheet,
+**Phase:** v1.2.1 shipped 2026-06-11 — the create-form polish pass after
-filter, settings, jump-to-date) still stubbed
+Jean-Luc's on-device review (v1.2.0 and v1.1.0 shipped the same day).
+Milestone 2 runs in four slices
+(`docs/superpowers/plans/2026-06-11-03-write-support.md`); next up is v1.3
+(edit event). Note: UI slices now hold release until his explicit approval.
 
 ## Progress
 
@@ -16,13 +19,33 @@ filter, settings, jump-to-date) still stubbed
 - [x] Plan 02 written and executed — data layer + permission flow + debug screen
 - [x] Month view (S1) — 6-week grid, event dots, today marker, swipe nav, three states (replaces debug screen)
 - [x] Week view (S2) — time schedule with overlap-resolved lanes, all-day strip, swipe nav, three states
-- [x] View-switcher (M1) wired — cycles Month ↔ Week (Day joins once S3 lands)
+- [x] Day view (S3) — single-column slice reusing the week layout
-- [ ] Day view (S3)
+- [x] View-switcher (M1) wired — cycles Month ↔ Week ↔ Day
-- [ ] Event-detail sheet (S4) — week/month event taps are currently no-ops
+- [x] Event-detail screen (S4) — full-screen, humanized recurrence
-- [ ] Filter sheet (M3), Settings (M4), Jump-to-date (M2) — drawer entries stubbed
+- [x] Filter sheet (M3) — per-calendar visibility, grouped by account, persisted, applied centrally in the repository
+- [x] Settings (M4) — appearance (theme, dynamic colour, week start), language (per-app locales), about
+- [~] Jump-to-date (M2) — **cut from scope**; "Today" half shipped in v0.5, date-picker dropped
+- [x] Full event read (v0.6) — reminders, status, availability, access level,
+  attendee role + self-response, foreign timezone, and linkified description
+  URLs in the detail view; new domain enums + mapper unit tests. (A dedicated
+  URL field was cut — no `CalendarContract` column backs it.)
+
+- [x] v1.1 write foundation — `WRITE_CALENDAR` (onboarding asks READ+WRITE,
+  only READ gates; contextual upgrade for v1.0 installs), read-only-calendar
+  detection (`CALENDAR_ACCESS_LEVEL` → `canModifyContents`, actions hidden for
+  WebCal/birthday calendars), delete from the detail screen (recurring:
+  "only this event" via cancelled exception / "all events in the series"),
+  repository + mapper tests
+
+- [x] v1.2 create event — full-screen `EventEditScreen` (title, all-day,
+  M3 date/time pickers with duration-preserving start moves, writable-only
+  calendar picker preselecting the last-used calendar, location, description),
+  "+" FAB on all three views prefilled with the visible day, `insertEvent`
+  with provider-correct all-day normalisation (UTC midnights, exclusive end),
+  domain/mapper/repository tests
 
 ## Next
 
-1. Day view (S3) — slot it into the view-switcher cycle
+1. v1.3 — edit event: reuse the form, series edit, reminder edit, simple
-2. Event-detail sheet (S4) — wire month-day and week-event taps to it
+   recurrence picker
-3. Revisit month/week UI polish + shared anchor-date continuity across views
+2. Monitor the F-Droid build/publish for v1.1.0 / v1.2.0

CHANGELOG.md

@@ -7,6 +7,169 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.2.1] — 2026-06-11
+
+### Added
+- Optional event-form fields with user-controlled defaults: reminders,
+  availability (busy/free), and visibility (default/public/private/
+  confidential) joined location and description as form sections. Settings
+  gained a "New event form" section choosing which show by default; the rest
+  unfold via a "More fields" picker
+- Reminders editor: stacked rows with right-bound remove, full-width add
+  action; the picker offers one-tap presets and a custom amount + unit
+  (minutes/hours/days/weeks) step
+- `OptionCard` — the app's standard selection-dialog row (full-width tonal
+  card, optional icon + supporting line, highlighted selection). All dialogs
+  (calendar, visibility, more-fields, reminder presets, recurring-delete)
+  now use it; radio-row dialogs are retired
+
+### Changed
+- Event form redesigned onto the detail screen's design system: tonal cards
+  with gutter icons (top-aligned on tall cards), borderless inline text
+  fields, calendar-coloured accent bar under the title, no dividers, no
+  top-bar title; placeholders render clearly fainter than input
+- M3 Expressive motion: the theme now provides a MotionScheme
+  (`MaterialExpressiveTheme`, standard springs — expressive bounce reviewed
+  as overdone), the FAB stack and "more fields" reveals animate on theme
+  springs
+- The jump-to-today slide is direction-aware (future → today slides in from
+  the left, past → from the right)
+- `versionName`/`versionCode` bumped to 1.2.1 / 10
+
+### Fixed
+- The keyboard no longer pans the whole event form; the screen stays
+  anchored and the focused field scrolls into view (`adjustResize` +
+  `imePadding`)
+
+## [1.2.0] — 2026-06-11
+
+### Added
+- Create events (milestone 2, slice 2):
+  - A "+" FAB on the month, week, and day views opens a new full-screen event
+    form, prefilled with the visible day (today at the next full hour, or
+    09:00 on other days)
+  - The form covers title, all-day toggle, start/end with Material 3 date and
+    time pickers (moving the start drags the end along, preserving duration),
+    target calendar, location, and description
+  - The calendar picker offers only writable calendars and preselects the one
+    you last created an event in
+  - Validation on save ("ends before it starts", no writable calendar), with
+    the same contextual write-permission upgrade as delete
+  - All-day events are stored provider-correctly (UTC midnights, exclusive
+    end), timed events in the device time zone
+
+### Changed
+- The jump-to-today pill now stacks above the new "+" FAB instead of being
+  the only floating action
+- `versionName`/`versionCode` bumped to 1.2.0 / 9
+
+## [1.1.0] — 2026-06-11
+
+### Added
+- Write foundation (milestone 2, slice 1): Calendula can now **delete events**.
+  - Delete action on the event detail screen, with a confirmation dialog;
+    recurring events choose between "Only this event" (a cancelled exception,
+    so the rest of the series survives) and "All events in the series"
+  - `WRITE_CALENDAR` permission: onboarding asks for read+write in one system
+    dialog, but only read access is required — declining write keeps the app
+    fully usable read-only. Existing v1.0 installs are asked for the write
+    upgrade in place, on their first delete
+  - Read-only calendars (WebCal subscriptions, birthday calendars, …) are
+    detected via `CALENDAR_ACCESS_LEVEL` and show no edit/delete actions at all
+
+### Changed
+- Onboarding copy no longer claims "read-only"; it now says your data stays on
+  the device (still no internet permission, still zero telemetry)
+- The placeholder Edit button on the detail screen (a no-op since v0.4) is
+  removed until editing ships in a later slice
+- `versionName`/`versionCode` bumped to 1.1.0 / 8
+
+## [1.0.0] — 2026-06-11
+
+First public release. Calendula is a read-only, Material 3 Expressive calendar
+that lives entirely on top of Android's `CalendarContract` — every calendar
+synced to the device (CalDAV via DAVx5, Google, local, WebCal, …) shows up
+automatically, with zero telemetry and no internet permission.
+
+### Highlights (accumulated across v0.1 → v0.6)
+- Month, week, and day views with a view switcher, swipe navigation, and
+  Loading / Failure / Success states on every screen
+- Full-screen event detail surfacing every readable `CalendarContract` field —
+  times, recurrence (humanised), location, description (with tappable links),
+  attendees + roles + your own response, reminders, status, availability,
+  access level, and foreign time zones
+- Per-calendar visibility filter (grouped by account, persisted) and a Settings
+  screen (theme, Material You dynamic colour, week start, app language)
+- Material 3 Expressive first-run onboarding for calendar access
+- German + English localization throughout
+
+### Changed
+- `versionName`/`versionCode` bumped to 1.0.0 / 7
+
+## [0.6.0] — 2026-06-11
+
+### Added
+- Full event read (v0.6): the detail screen now surfaces every readable
+  `CalendarContract` field that V1 had been dropping —
+  - **Reminders** — each configured lead time, humanised ("10 minutes before",
+    "1 day before", "At time of event"), read from `CalendarContract.Reminders`
+  - **Status** — Tentative / Cancelled chip under the title; a cancelled event
+    also strikes through its title (Confirmed shows no chip)
+  - **Availability** — a "Free" pill pinned top-right of the title when the
+    event doesn't block your time (`Events.AVAILABILITY`, the iCal TRANSP
+    field); the default "Busy" is left implicit to avoid noise on every event
+  - **Access level** — a Private / Confidential chip when the event isn't public
+  - **Attendee role** — organizer / optional / resource badge under each
+    attendee, plus the device user's own response ("Your response: …") from
+    `Events.SELF_ATTENDEE_STATUS`
+  - **Time zone** — shown only for timed events pinned to a zone other than the
+    device's, so cross-zone events read unambiguously
+  - **Linked URLs** — http(s) links in the description are now tappable
+- Domain model rounded out with `Reminder`, `EventStatus`, `Availability`,
+  `AccessLevel`, `AttendeeRelationship`, `AttendeeType`, and the attendee/self
+  status fields; mappers + unit tests cover every new column's integer codes
+
+### Changed
+- Redesigned the first-run grant-access screen — the onboarding a new user
+  sees. Material 3 Expressive layout: branded launcher-mark hero, an app-name
+  eyebrow, a benefit-led headline, three trust rows (on-device, every calendar,
+  no tracking) with tonal icon chips, a full-width filled CTA with a trailing
+  arrow, and a "Read-only · no internet permission" footnote (the app declares
+  only `READ_CALENDAR`). The denied/recovery state shares the same shell with a
+  lock-badged hero and Open-settings / Try-again actions
+- `versionName`/`versionCode` bumped to 0.6.0 / 6
+
+### Notes
+- A dedicated event **URL** field was dropped from scope: `CalendarContract`
+  has no `Events.URL` column (only `CUSTOM_APP_URI`, an app deep-link), so URLs
+  are surfaced by linkifying the description instead
+
+## [0.5.0] — 2026-06-10
+
+### Added
+- Calendar filter (M3): the navigation drawer now hosts the calendar list
+  inline — every calendar grouped by account, each with a colour swatch and a
+  visibility switch. Hiding a calendar is persisted app-side (DataStore,
+  separate from the system VISIBLE flag) and applied centrally in the
+  repository, so month/week/day re-filter live the moment a switch flips.
+  The drawer was trimmed to just Today, the calendar filter, and Settings
+  (the stubbed jump-to-date entry was removed; jump-to-date was later cut
+  from scope entirely)
+- Settings (M4): a full-screen destination with
+  - **Appearance** — theme (System / Light / Dark), Material You dynamic colour
+    (auto-disabled below Android 12), week start (Automatic / Monday / Sunday)
+  - **Language** — app language (System / Deutsch / English) via per-app
+    locales, persisted across cold starts down to Android 10
+  - **About** — version, license, and a link to the source on Gitea
+- Week-start preference now drives the month grid and week view; "Automatic"
+  follows the active locale (Monday in DE, Sunday in en-US)
+
+### Changed
+- Theme is driven by one activity-scoped settings source, so a theme or
+  dynamic-colour change applies app-wide immediately
+- `versionName`/`versionCode` bumped to 0.5.0 / 5 (the in-repo version had
+  lagged behind the release tags); the About screen reads it directly
+
 ## [0.4.0] — 2026-06-10
 
 ### Added

app/build.gradle.kts

@@ -23,8 +23,8 @@ android {
         applicationId = "de.jeanlucmakiola.calendula"
         minSdk = 29
         targetSdk = 36
-        versionCode = 1
+        versionCode = 10
-        versionName = "0.1.0"
+        versionName = "1.2.1"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }
@@ -89,6 +89,7 @@ kotlin {
 
 dependencies {
     implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.appcompat)
     implementation(libs.androidx.lifecycle.runtime.ktx)
     implementation(libs.androidx.lifecycle.runtime.compose)
     implementation(libs.androidx.activity.compose)

app/src/androidTest/java/de/jeanlucmakiola/calendula/data/calendar/CalendarRepositorySmokeTest.kt

@@ -1,10 +1,14 @@
 package de.jeanlucmakiola.calendula.data.calendar
 
 import android.Manifest
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.PreferenceDataStoreFactory
+import androidx.datastore.preferences.core.Preferences
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import androidx.test.platform.app.InstrumentationRegistry
 import androidx.test.rule.GrantPermissionRule
 import com.google.common.truth.Truth.assertThat
+import de.jeanlucmakiola.calendula.data.prefs.CalendarPrefs
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.runBlocking
@@ -24,7 +28,10 @@ class CalendarRepositorySmokeTest {
 
     private fun newRepo(): CalendarRepositoryImpl {
         val dataSource = AndroidCalendarDataSource(context)
-        return CalendarRepositoryImpl(dataSource, Dispatchers.IO)
+        val store: DataStore<Preferences> = PreferenceDataStoreFactory.create(
+            produceFile = { context.cacheDir.resolve("smoke_test_prefs.preferences_pb") },
+        )
+        return CalendarRepositoryImpl(dataSource, CalendarPrefs(store), Dispatchers.IO)
     }
 
     @Test

app/src/main/AndroidManifest.xml

@@ -3,6 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <uses-permission android:name="android.permission.READ_CALENDAR" />
+    <uses-permission android:name="android.permission.WRITE_CALENDAR" />
 
     <application
         android:name=".CalendulaApp"
@@ -17,12 +18,24 @@
         tools:targetApi="35">
         <activity
             android:name=".MainActivity"
-            android:exported="true">
+            android:exported="true"
+            android:windowSoftInputMode="adjustResize">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+
+        <!-- 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
+            android:name="androidx.appcompat.app.AppLocalesMetadataHolderService"
+            android:enabled="false"
+            android:exported="false">
+            <meta-data
+                android:name="autoStoreLocales"
+                android:value="true" />
+        </service>
     </application>
 
 </manifest>

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

@@ -4,10 +4,16 @@ import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
+import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.runtime.getValue
 import androidx.compose.ui.Modifier
+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.settings.SettingsViewModel
 import de.jeanlucmakiola.calendula.ui.theme.CalendulaTheme
 
 @AndroidEntryPoint
@@ -16,7 +22,19 @@ class MainActivity : ComponentActivity() {
         super.onCreate(savedInstanceState)
         enableEdgeToEdge()
         setContent {
-            CalendulaTheme {
+            // One activity-scoped SettingsViewModel drives both the theme here
+            // and the Settings screen, so a theme change applies app-wide at once.
+            val settingsViewModel: SettingsViewModel = hiltViewModel()
+            val settings by settingsViewModel.state.collectAsStateWithLifecycle()
+            val darkTheme = when (settings.themeMode) {
+                ThemeMode.SYSTEM -> isSystemInDarkTheme()
+                ThemeMode.LIGHT -> false
+                ThemeMode.DARK -> true
+            }
+            CalendulaTheme(
+                darkTheme = darkTheme,
+                dynamicColor = settings.dynamicColor,
+            ) {
                 RootScreen(modifier = Modifier.fillMaxSize())
             }
         }

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

@@ -2,17 +2,22 @@ package de.jeanlucmakiola.calendula.data.calendar
 
 import android.content.ContentResolver
 import android.content.ContentUris
+import android.content.ContentValues
 import android.content.Context
 import android.database.ContentObserver
 import android.database.Cursor
 import android.os.Handler
 import android.os.Looper
 import android.provider.CalendarContract
+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.EventDetail
+import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.Reminder
+import java.time.ZoneId
 import javax.inject.Inject
 import javax.inject.Singleton
 
@@ -28,6 +33,19 @@ interface CalendarDataSource {
     fun calendars(): List<CalendarSource>
     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
+
+    /** Delete the whole event (for recurring events: the entire series). */
+    fun deleteEvent(eventId: Long)
+
+    /**
+     * Cancel a single occurrence of a recurring event by inserting a
+     * cancelled exception at [beginMillis] (the occurrence's `Instances.BEGIN`).
+     */
+    fun deleteOccurrence(eventId: Long, beginMillis: Long)
+
     fun registerChangeListener(listener: () -> Unit)
     fun unregisterChangeListener(listener: () -> Unit)
 }
@@ -62,16 +80,76 @@ class AndroidCalendarDataSource @Inject constructor(
 
     override fun eventDetail(eventId: Long): EventDetail? {
         val attendees = queryAttendees(eventId)
+        val reminders = queryReminders(eventId)
         return resolver.query(
             ContentUris.withAppendedId(CalendarContract.Events.CONTENT_URI, eventId),
             EventDetailProjection.COLUMNS,
             null, null, null,
         )?.use { c ->
             if (!c.moveToFirst()) null
-            else CursorColumnReader(c).toEventDetailCore(attendees)
+            else CursorColumnReader(c).toEventDetailCore(attendees, reminders)
         }
     }
 
+    override fun insertEvent(form: EventForm): Long {
+        val times = form.toWriteTimes(ZoneId.systemDefault())
+        val values = ContentValues().apply {
+            put(
+                CalendarContract.Events.CALENDAR_ID,
+                requireNotNull(form.calendarId) { "EventForm.calendarId is required" },
+            )
+            put(CalendarContract.Events.TITLE, form.title.trim())
+            put(CalendarContract.Events.ALL_DAY, if (form.isAllDay) 1 else 0)
+            put(CalendarContract.Events.DTSTART, times.dtStartMillis)
+            put(CalendarContract.Events.DTEND, times.dtEndMillis)
+            put(CalendarContract.Events.EVENT_TIMEZONE, times.timezone)
+            put(CalendarContract.Events.AVAILABILITY, form.availability.toProviderValue())
+            put(CalendarContract.Events.ACCESS_LEVEL, form.accessLevel.toProviderValue())
+            form.location.trim().takeIf { it.isNotEmpty() }
+                ?.let { put(CalendarContract.Events.EVENT_LOCATION, it) }
+            form.description.trim().takeIf { it.isNotEmpty() }
+                ?.let { put(CalendarContract.Events.DESCRIPTION, it) }
+        }
+        val uri = resolver.insert(CalendarContract.Events.CONTENT_URI, values)
+            ?: throw WriteFailedException("insert event into calendar id=${form.calendarId}")
+        val eventId = ContentUris.parseId(uri)
+        // Best effort (spec §8): the event exists at this point — a reminder
+        // that fails to attach is logged, not surfaced as a failed create.
+        form.reminders.distinct().forEach { minutes ->
+            val reminder = ContentValues().apply {
+                put(CalendarContract.Reminders.EVENT_ID, eventId)
+                put(CalendarContract.Reminders.MINUTES, minutes)
+                put(CalendarContract.Reminders.METHOD, CalendarContract.Reminders.METHOD_ALERT)
+            }
+            if (resolver.insert(CalendarContract.Reminders.CONTENT_URI, reminder) == null) {
+                Log.w(TAG, "Failed to attach reminder ($minutes min) to event $eventId")
+            }
+        }
+        return eventId
+    }
+
+    override fun deleteEvent(eventId: Long) {
+        val deleted = resolver.delete(
+            ContentUris.withAppendedId(CalendarContract.Events.CONTENT_URI, eventId),
+            null, null,
+        )
+        if (deleted == 0) throw WriteFailedException("delete event id=$eventId")
+    }
+
+    override fun deleteOccurrence(eventId: Long, beginMillis: Long) {
+        // A cancelled exception row hides exactly this occurrence; the sync
+        // adapter turns it into an EXDATE/cancelled VEVENT upstream.
+        val values = ContentValues().apply {
+            put(CalendarContract.Events.ORIGINAL_INSTANCE_TIME, beginMillis)
+            put(CalendarContract.Events.STATUS, CalendarContract.Events.STATUS_CANCELED)
+        }
+        val uri = ContentUris.withAppendedId(
+            CalendarContract.Events.CONTENT_EXCEPTION_URI, eventId,
+        )
+        resolver.insert(uri, values)
+            ?: throw WriteFailedException("cancel occurrence event id=$eventId begin=$beginMillis")
+    }
+
     override fun registerChangeListener(listener: () -> Unit) {
         val obs = object : ContentObserver(Handler(Looper.getMainLooper())) {
             override fun onChange(selfChange: Boolean) {
@@ -98,6 +176,14 @@ class AndroidCalendarDataSource @Inject constructor(
         null,
     )?.use { c -> c.mapAll { CursorColumnReader(c).toAttendee() } } ?: emptyList()
 
+    private fun queryReminders(eventId: Long): List<Reminder> = resolver.query(
+        CalendarContract.Reminders.CONTENT_URI,
+        ReminderProjection.COLUMNS,
+        CalendarContract.Reminders.EVENT_ID + " = ?",
+        arrayOf(eventId.toString()),
+        null,
+    )?.use { c -> c.mapAll { CursorColumnReader(c).toReminder() } } ?: emptyList()
+
     private fun toCalendarSource(c: Cursor): CalendarSource = CursorColumnReader(c).toCalendarSource()
 
     /** Iterate every row and map; skips nothing. */
@@ -109,4 +195,8 @@ class AndroidCalendarDataSource @Inject constructor(
     private inline fun <T : Any> Cursor.mapAllNotNull(mapper: (Cursor) -> T?): List<T> = buildList {
         while (moveToNext()) mapper(this@mapAllNotNull)?.let(::add)
     }
+
+    private companion object {
+        const val TAG = "CalendarDataSource"
+    }
 }

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

@@ -1,5 +1,6 @@
 package de.jeanlucmakiola.calendula.data.calendar
 
+import android.provider.CalendarContract
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 
 internal fun ColumnReader.toCalendarSource(): CalendarSource = CalendarSource(
@@ -10,4 +11,6 @@ internal fun ColumnReader.toCalendarSource(): CalendarSource = CalendarSource(
     accountType = getString(CalendarProjection.IDX_ACCOUNT_TYPE).orEmpty(),
     color = getInt(CalendarProjection.IDX_COLOR),
     isVisibleInSystem = getInt(CalendarProjection.IDX_VISIBLE) != 0,
+    canModifyContents = getInt(CalendarProjection.IDX_ACCESS_LEVEL) >=
+        CalendarContract.Calendars.CAL_ACCESS_CONTRIBUTOR,
 )

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

@@ -2,6 +2,7 @@ package de.jeanlucmakiola.calendula.data.calendar
 
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventDetail
+import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
 import kotlinx.coroutines.flow.Flow
 import kotlin.time.Instant
@@ -10,7 +11,20 @@ interface CalendarRepository {
     fun calendars(): Flow<List<CalendarSource>>
     fun instances(range: ClosedRange<Instant>): Flow<List<EventInstance>>
     suspend fun eventDetail(eventId: Long): EventDetail
+
+    /** Create a new event from a validated form; returns the new `Events._ID`. */
+    suspend fun createEvent(form: EventForm): Long
+
+    /** Delete the whole event (for recurring events: the entire series). */
+    suspend fun deleteEvent(eventId: Long)
+
+    /** Cancel a single occurrence of a recurring event at its `Instances.BEGIN` time. */
+    suspend fun deleteOccurrence(eventId: Long, beginMillis: Long)
 }
 
 class NoSuchEventException(eventId: Long) :
     NoSuchElementException("No event with id=$eventId")
+
+/** A ContentResolver write affected no rows or returned no URI. */
+class WriteFailedException(operation: String) :
+    RuntimeException("Calendar write failed: $operation")

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

@@ -1,12 +1,15 @@
 package de.jeanlucmakiola.calendula.data.calendar
 
 import de.jeanlucmakiola.calendula.data.di.IoDispatcher
+import de.jeanlucmakiola.calendula.data.prefs.CalendarPrefs
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventDetail
+import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.onStart
@@ -23,6 +26,7 @@ import javax.inject.Singleton
 @Singleton
 class CalendarRepositoryImpl @Inject constructor(
     private val dataSource: CalendarDataSource,
+    private val prefs: CalendarPrefs,
     @IoDispatcher private val io: CoroutineDispatcher,
 ) : CalendarRepository {
 
@@ -41,7 +45,13 @@ class CalendarRepositoryImpl @Inject constructor(
             .reQuery { dataSource.calendars() }
             .flowOn(io)
 
+    // Instances are filtered by the app-side hidden-calendar set (M3): an event
+    // is dropped whenever the user has hidden its calendar. Re-runs when the
+    // provider ticks *or* the hidden set changes — toggling a calendar in the
+    // filter sheet updates every view immediately. [calendars] stays unfiltered
+    // so the filter sheet can list and re-enable hidden calendars.
     override fun instances(range: ClosedRange<Instant>): Flow<List<EventInstance>> =
+        combine(
             ticks
                 .onStart { emit(Unit) }
                 .reQuery {
@@ -49,12 +59,28 @@ class CalendarRepositoryImpl @Inject constructor(
                         beginMillis = range.start.toEpochMillis(),
                         endMillis = range.endInclusive.toEpochMillis(),
                     )
-            }
+                },
-            .flowOn(io)
+            prefs.hiddenCalendarIds,
+        ) { instances, hidden ->
+            if (hidden.isEmpty()) instances
+            else instances.filterNot { it.calendarId in hidden }
+        }.flowOn(io)
 
     override suspend fun eventDetail(eventId: Long): EventDetail = withContext(io) {
         dataSource.eventDetail(eventId) ?: throw NoSuchEventException(eventId)
     }
+
+    override suspend fun createEvent(form: EventForm): Long = withContext(io) {
+        dataSource.insertEvent(form)
+    }
+
+    override suspend fun deleteEvent(eventId: Long) = withContext(io) {
+        dataSource.deleteEvent(eventId)
+    }
+
+    override suspend fun deleteOccurrence(eventId: Long, beginMillis: Long) = withContext(io) {
+        dataSource.deleteOccurrence(eventId, beginMillis)
+    }
 }
 
 private fun <T> Flow<Unit>.reQuery(block: suspend () -> T): Flow<T> = flow {

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

@@ -2,14 +2,24 @@ package de.jeanlucmakiola.calendula.data.calendar
 
 import android.provider.CalendarContract
 import android.util.Log
+import de.jeanlucmakiola.calendula.domain.AccessLevel
 import de.jeanlucmakiola.calendula.domain.Attendee
+import de.jeanlucmakiola.calendula.domain.AttendeeRelationship
 import de.jeanlucmakiola.calendula.domain.AttendeeStatus
+import de.jeanlucmakiola.calendula.domain.AttendeeType
+import de.jeanlucmakiola.calendula.domain.Availability
 import de.jeanlucmakiola.calendula.domain.EventDetail
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.EventStatus
+import de.jeanlucmakiola.calendula.domain.Reminder
+import de.jeanlucmakiola.calendula.domain.ReminderMethod
 
 private const val TAG = "EventDetailMapper"
 
-internal fun ColumnReader.toEventDetailCore(attendees: List<Attendee>): EventDetail? {
+internal fun ColumnReader.toEventDetailCore(
+    attendees: List<Attendee>,
+    reminders: List<Reminder>,
+): EventDetail? {
     val begin = getLong(EventDetailProjection.IDX_DTSTART)
 
     if (begin < 0L) {
@@ -54,12 +64,28 @@ internal fun ColumnReader.toEventDetailCore(attendees: List<Attendee>): EventDet
         location = getString(EventDetailProjection.IDX_LOCATION),
     )
 
+    // 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)) {
+        EventStatus.Confirmed
+    } else {
+        mapEventStatus(getInt(EventDetailProjection.IDX_STATUS))
+    }
+
     return EventDetail(
         instance = instance,
         description = getString(EventDetailProjection.IDX_DESCRIPTION),
         organizer = getString(EventDetailProjection.IDX_ORGANIZER),
         attendees = attendees,
         rrule = getString(EventDetailProjection.IDX_RRULE),
+        reminders = reminders,
+        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.
+        availability = mapAvailability(getInt(EventDetailProjection.IDX_AVAILABILITY)),
+        accessLevel = mapAccessLevel(getInt(EventDetailProjection.IDX_ACCESS_LEVEL)),
+        eventTimezone = getString(EventDetailProjection.IDX_EVENT_TIMEZONE),
+        selfStatus = mapAttendeeStatus(getInt(EventDetailProjection.IDX_SELF_ATTENDEE_STATUS)),
     )
 }
 
@@ -67,6 +93,13 @@ internal fun ColumnReader.toAttendee(): Attendee = Attendee(
     name = getString(AttendeeProjection.IDX_NAME).orEmpty(),
     email = getString(AttendeeProjection.IDX_EMAIL),
     status = mapAttendeeStatus(getInt(AttendeeProjection.IDX_STATUS)),
+    relationship = mapAttendeeRelationship(getInt(AttendeeProjection.IDX_RELATIONSHIP)),
+    type = mapAttendeeType(getInt(AttendeeProjection.IDX_TYPE)),
+)
+
+internal fun ColumnReader.toReminder(): Reminder = Reminder(
+    minutes = getInt(ReminderProjection.IDX_MINUTES),
+    method = mapReminderMethod(getInt(ReminderProjection.IDX_METHOD)),
 )
 
 internal fun mapAttendeeStatus(raw: Int): AttendeeStatus = when (raw) {
@@ -76,3 +109,46 @@ internal fun mapAttendeeStatus(raw: Int): AttendeeStatus = when (raw) {
     CalendarContract.Attendees.ATTENDEE_STATUS_INVITED -> AttendeeStatus.NeedsAction
     else -> AttendeeStatus.Unknown
 }
+
+internal fun mapAttendeeRelationship(raw: Int): AttendeeRelationship = when (raw) {
+    CalendarContract.Attendees.RELATIONSHIP_ORGANIZER -> AttendeeRelationship.Organizer
+    CalendarContract.Attendees.RELATIONSHIP_PERFORMER -> AttendeeRelationship.Performer
+    CalendarContract.Attendees.RELATIONSHIP_SPEAKER -> AttendeeRelationship.Speaker
+    CalendarContract.Attendees.RELATIONSHIP_ATTENDEE -> AttendeeRelationship.Attendee
+    else -> AttendeeRelationship.None
+}
+
+internal fun mapAttendeeType(raw: Int): AttendeeType = when (raw) {
+    CalendarContract.Attendees.TYPE_REQUIRED -> AttendeeType.Required
+    CalendarContract.Attendees.TYPE_OPTIONAL -> AttendeeType.Optional
+    CalendarContract.Attendees.TYPE_RESOURCE -> AttendeeType.Resource
+    else -> AttendeeType.None
+}
+
+internal fun mapEventStatus(raw: Int): EventStatus = when (raw) {
+    CalendarContract.Events.STATUS_CONFIRMED -> EventStatus.Confirmed
+    CalendarContract.Events.STATUS_TENTATIVE -> EventStatus.Tentative
+    CalendarContract.Events.STATUS_CANCELED -> EventStatus.Cancelled
+    else -> EventStatus.Confirmed
+}
+
+internal fun mapAvailability(raw: Int): Availability = when (raw) {
+    CalendarContract.Events.AVAILABILITY_FREE -> Availability.Free
+    CalendarContract.Events.AVAILABILITY_TENTATIVE -> Availability.Tentative
+    else -> Availability.Busy
+}
+
+internal fun mapAccessLevel(raw: Int): AccessLevel = when (raw) {
+    CalendarContract.Events.ACCESS_CONFIDENTIAL -> AccessLevel.Confidential
+    CalendarContract.Events.ACCESS_PRIVATE -> AccessLevel.Private
+    CalendarContract.Events.ACCESS_PUBLIC -> AccessLevel.Public
+    else -> AccessLevel.Default
+}
+
+internal fun mapReminderMethod(raw: Int): ReminderMethod = when (raw) {
+    CalendarContract.Reminders.METHOD_EMAIL -> ReminderMethod.Email
+    CalendarContract.Reminders.METHOD_SMS -> ReminderMethod.Sms
+    CalendarContract.Reminders.METHOD_ALARM -> ReminderMethod.Alarm
+    CalendarContract.Reminders.METHOD_ALERT -> ReminderMethod.Alert
+    else -> ReminderMethod.Default
+}

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

@@ -0,0 +1,51 @@
+package de.jeanlucmakiola.calendula.data.calendar
+
+import android.provider.CalendarContract
+import de.jeanlucmakiola.calendula.domain.AccessLevel
+import de.jeanlucmakiola.calendula.domain.Availability
+import de.jeanlucmakiola.calendula.domain.EventForm
+import kotlinx.datetime.toJavaLocalDate
+import kotlinx.datetime.toJavaLocalDateTime
+import java.time.ZoneId
+import java.time.ZoneOffset
+
+/** Provider-ready DTSTART / DTEND / EVENT_TIMEZONE for an event write. */
+internal data class EventWriteTimes(
+    val dtStartMillis: Long,
+    val dtEndMillis: Long,
+    val timezone: String,
+)
+
+/**
+ * All-day events live at UTC midnights with an exclusive DTEND (the
+ * CalendarContract convention — a one-day event ends at the next midnight);
+ * timed events resolve their wall-clock values in [zone].
+ */
+internal fun EventForm.toWriteTimes(zone: ZoneId): EventWriteTimes = if (isAllDay) {
+    EventWriteTimes(
+        dtStartMillis = start.date.toJavaLocalDate()
+            .atStartOfDay(ZoneOffset.UTC).toInstant().toEpochMilli(),
+        dtEndMillis = end.date.toJavaLocalDate().plusDays(1)
+            .atStartOfDay(ZoneOffset.UTC).toInstant().toEpochMilli(),
+        timezone = "UTC",
+    )
+} else {
+    EventWriteTimes(
+        dtStartMillis = start.toJavaLocalDateTime().atZone(zone).toInstant().toEpochMilli(),
+        dtEndMillis = end.toJavaLocalDateTime().atZone(zone).toInstant().toEpochMilli(),
+        timezone = zone.id,
+    )
+}
+
+internal fun Availability.toProviderValue(): Int = when (this) {
+    Availability.Busy -> CalendarContract.Events.AVAILABILITY_BUSY
+    Availability.Free -> CalendarContract.Events.AVAILABILITY_FREE
+    Availability.Tentative -> CalendarContract.Events.AVAILABILITY_TENTATIVE
+}
+
+internal fun AccessLevel.toProviderValue(): Int = when (this) {
+    AccessLevel.Default -> CalendarContract.Events.ACCESS_DEFAULT
+    AccessLevel.Confidential -> CalendarContract.Events.ACCESS_CONFIDENTIAL
+    AccessLevel.Private -> CalendarContract.Events.ACCESS_PRIVATE
+    AccessLevel.Public -> CalendarContract.Events.ACCESS_PUBLIC
+}

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

@@ -10,6 +10,7 @@ internal object CalendarProjection {
         CalendarContract.Calendars.ACCOUNT_TYPE,
         CalendarContract.Calendars.CALENDAR_COLOR,
         CalendarContract.Calendars.VISIBLE,
+        CalendarContract.Calendars.CALENDAR_ACCESS_LEVEL,
     )
 
     const val IDX_ID = 0
@@ -18,6 +19,7 @@ internal object CalendarProjection {
     const val IDX_ACCOUNT_TYPE = 3
     const val IDX_COLOR = 4
     const val IDX_VISIBLE = 5
+    const val IDX_ACCESS_LEVEL = 6
 }
 
 internal object InstanceProjection {
@@ -60,6 +62,11 @@ internal object EventDetailProjection {
         CalendarContract.Events.ALL_DAY,
         CalendarContract.Events.EVENT_LOCATION,
         CalendarContract.Events.CALENDAR_ID,
+        CalendarContract.Events.STATUS,
+        CalendarContract.Events.AVAILABILITY,
+        CalendarContract.Events.ACCESS_LEVEL,
+        CalendarContract.Events.EVENT_TIMEZONE,
+        CalendarContract.Events.SELF_ATTENDEE_STATUS,
     )
 
     const val IDX_EVENT_ID = 0
@@ -74,6 +81,11 @@ internal object EventDetailProjection {
     const val IDX_ALL_DAY = 9
     const val IDX_LOCATION = 10
     const val IDX_CALENDAR_ID = 11
+    const val IDX_STATUS = 12
+    const val IDX_AVAILABILITY = 13
+    const val IDX_ACCESS_LEVEL = 14
+    const val IDX_EVENT_TIMEZONE = 15
+    const val IDX_SELF_ATTENDEE_STATUS = 16
 }
 
 internal object AttendeeProjection {
@@ -81,11 +93,25 @@ internal object AttendeeProjection {
         CalendarContract.Attendees.ATTENDEE_NAME,
         CalendarContract.Attendees.ATTENDEE_EMAIL,
         CalendarContract.Attendees.ATTENDEE_STATUS,
+        CalendarContract.Attendees.ATTENDEE_RELATIONSHIP,
+        CalendarContract.Attendees.ATTENDEE_TYPE,
     )
 
     const val IDX_NAME = 0
     const val IDX_EMAIL = 1
     const val IDX_STATUS = 2
+    const val IDX_RELATIONSHIP = 3
+    const val IDX_TYPE = 4
+}
+
+internal object ReminderProjection {
+    val COLUMNS: Array<String> = arrayOf(
+        CalendarContract.Reminders.MINUTES,
+        CalendarContract.Reminders.METHOD,
+    )
+
+    const val IDX_MINUTES = 0
+    const val IDX_METHOD = 1
 }
 
 internal object Fallbacks {

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

@@ -3,6 +3,7 @@ package de.jeanlucmakiola.calendula.data.prefs
 import androidx.datastore.core.DataStore
 import androidx.datastore.preferences.core.Preferences
 import androidx.datastore.preferences.core.edit
+import androidx.datastore.preferences.core.longPreferencesKey
 import androidx.datastore.preferences.core.stringPreferencesKey
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.map
@@ -38,7 +39,20 @@ class CalendarPrefs @Inject constructor(
         }
     }
 
+    /**
+     * The calendar the user last created an event in; preselected in the
+     * event form. Null until the first event is created.
+     */
+    val lastUsedCalendarId: Flow<Long?> = store.data.map { prefs ->
+        prefs[LAST_USED_CALENDAR_KEY]
+    }
+
+    suspend fun setLastUsedCalendarId(id: Long) {
+        store.edit { prefs -> prefs[LAST_USED_CALENDAR_KEY] = id }
+    }
+
     companion object {
         internal val HIDDEN_IDS_KEY = stringPreferencesKey("hidden_calendar_ids")
+        internal val LAST_USED_CALENDAR_KEY = longPreferencesKey("last_used_calendar_id")
     }
 }

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

@@ -0,0 +1,107 @@
+package de.jeanlucmakiola.calendula.data.prefs
+
+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.stringPreferencesKey
+import de.jeanlucmakiola.calendula.domain.EventFormField
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
+import kotlinx.datetime.DayOfWeek
+import java.time.temporal.WeekFields
+import java.util.Locale
+import javax.inject.Inject
+import javax.inject.Singleton
+
+/** Light/dark override. SYSTEM follows the device setting. */
+enum class ThemeMode { SYSTEM, LIGHT, DARK }
+
+/** Week-start override. AUTO derives the first day from the active locale. */
+enum class WeekStartPref { AUTO, MONDAY, SUNDAY }
+
+/**
+ * Resolve the preference to a concrete first-day-of-week. AUTO reads the
+ * locale's convention (e.g. Monday in DE, Sunday in en-US).
+ */
+fun WeekStartPref.resolveFirstDay(locale: Locale): DayOfWeek = when (this) {
+    WeekStartPref.MONDAY -> DayOfWeek.MONDAY
+    WeekStartPref.SUNDAY -> DayOfWeek.SUNDAY
+    // java.time.DayOfWeek.value is ISO 1..7 (Mon..Sun) — same numbering kotlinx uses.
+    WeekStartPref.AUTO -> DayOfWeek(WeekFields.of(locale).firstDayOfWeek.value)
+}
+
+/**
+ * Display settings (M4) persisted app-side: theme override, Material You
+ * dynamic colour, and week start. Language is handled separately through
+ * AppCompatDelegate (which persists its own per-app locale).
+ *
+ * Enum prefs round-trip by [Enum.name]; an unknown/garbage stored value falls
+ * back to the default rather than throwing (see SettingsPrefsTest).
+ */
+@Singleton
+class SettingsPrefs @Inject constructor(
+    private val store: DataStore<Preferences>,
+) {
+
+    val themeMode: Flow<ThemeMode> = store.data.map { prefs ->
+        prefs[THEME_MODE_KEY].toEnum(ThemeMode.SYSTEM)
+    }
+
+    val dynamicColor: Flow<Boolean> = store.data.map { prefs ->
+        prefs[DYNAMIC_COLOR_KEY] ?: true
+    }
+
+    val weekStart: Flow<WeekStartPref> = store.data.map { prefs ->
+        prefs[WEEK_START_KEY].toEnum(WeekStartPref.AUTO)
+    }
+
+    suspend fun setThemeMode(mode: ThemeMode) {
+        store.edit { it[THEME_MODE_KEY] = mode.name }
+    }
+
+    suspend fun setDynamicColor(enabled: Boolean) {
+        store.edit { it[DYNAMIC_COLOR_KEY] = enabled }
+    }
+
+    suspend fun setWeekStart(pref: WeekStartPref) {
+        store.edit { it[WEEK_START_KEY] = pref.name }
+    }
+
+    /**
+     * Optional event-form fields shown by default (the rest hide behind
+     * "more fields"). Stored comma-joined by enum name: an absent key means
+     * the factory default, an empty string means "none". Unknown names are
+     * dropped defensively, like the other enum prefs.
+     */
+    val defaultFormFields: Flow<Set<EventFormField>> = store.data.map { prefs ->
+        parseFormFields(prefs[FORM_FIELDS_KEY])
+    }
+
+    suspend fun setFormFieldDefault(field: EventFormField, enabled: Boolean) {
+        store.edit { prefs ->
+            val current = parseFormFields(prefs[FORM_FIELDS_KEY])
+            val updated = if (enabled) current + field else current - field
+            prefs[FORM_FIELDS_KEY] = updated.joinToString(",") { it.name }
+        }
+    }
+
+    private fun parseFormFields(stored: String?): Set<EventFormField> = when (stored) {
+        null -> DEFAULT_FORM_FIELDS
+        else -> stored.split(',')
+            .mapNotNull { name -> EventFormField.entries.firstOrNull { it.name == name.trim() } }
+            .toSet()
+    }
+
+    companion object {
+        internal val THEME_MODE_KEY = stringPreferencesKey("theme_mode")
+        internal val DYNAMIC_COLOR_KEY = booleanPreferencesKey("dynamic_color")
+        internal val WEEK_START_KEY = stringPreferencesKey("week_start")
+        internal val FORM_FIELDS_KEY = stringPreferencesKey("event_form_default_fields")
+        internal val DEFAULT_FORM_FIELDS =
+            setOf(EventFormField.Location, EventFormField.Description)
+    }
+}
+
+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

@@ -0,0 +1,51 @@
+package de.jeanlucmakiola.calendula.domain
+
+import kotlinx.datetime.LocalDateTime
+
+/**
+ * User input for creating an event (and, from v1.3, editing one). Times are
+ * wall-clock values in the device zone; the data layer translates them to
+ * provider millis (all-day events normalise to UTC midnights there).
+ */
+data class EventForm(
+    val calendarId: Long?,
+    val title: String = "",
+    val isAllDay: Boolean = false,
+    val start: LocalDateTime,
+    val end: LocalDateTime,
+    val location: String = "",
+    val description: String = "",
+    /** Reminder lead times in minutes before the start, deduplicated. */
+    val reminders: List<Int> = emptyList(),
+    val availability: Availability = Availability.Busy,
+    val accessLevel: AccessLevel = AccessLevel.Default,
+)
+
+/**
+ * The form's optional sections. Which ones show by default is a user setting;
+ * the rest unfold behind a "more fields" button.
+ */
+enum class EventFormField {
+    Location,
+    Description,
+    Reminders,
+    Availability,
+    Visibility,
+}
+
+enum class EventFormProblem {
+    /** No target calendar — none picked and no writable calendar exists. */
+    NoCalendar,
+    EndBeforeStart,
+}
+
+/**
+ * Validation; an empty set means the form can be saved. A blank title is
+ * allowed (display falls back to "(No title)", matching the provider), and a
+ * zero-length timed event is allowed (spec §8: instant events exist).
+ */
+fun EventForm.problems(): Set<EventFormProblem> = buildSet {
+    if (calendarId == null) add(EventFormProblem.NoCalendar)
+    val endsTooEarly = if (isAllDay) end.date < start.date else end < start
+    if (endsTooEarly) add(EventFormProblem.EndBeforeStart)
+}

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

@@ -9,6 +9,12 @@ data class CalendarSource(
     val accountType: String,
     val color: Int,
     val isVisibleInSystem: Boolean,
+    /**
+     * Whether events in this calendar can be created/edited/deleted
+     * (`Calendars.CALENDAR_ACCESS_LEVEL` >= contributor). False for WebCal
+     * subscriptions, birthday calendars and other read-only sources.
+     */
+    val canModifyContents: Boolean = false,
 )
 
 data class EventInstance(
@@ -29,12 +35,34 @@ data class EventDetail(
     val organizer: String?,
     val attendees: List<Attendee>,
     val rrule: String?,
+    /** Reminders (VALARM) configured on the event, ascending lead time. */
+    val reminders: List<Reminder> = emptyList(),
+    /** Confirmed / Tentative / Cancelled (`Events.STATUS`). */
+    val status: EventStatus = EventStatus.Confirmed,
+    /** Busy / Free (`Events.AVAILABILITY`, the iCal TRANSP field). */
+    val availability: Availability = Availability.Busy,
+    /** Default / Private / Confidential / Public (`Events.ACCESS_LEVEL`). */
+    val accessLevel: AccessLevel = AccessLevel.Default,
+    /** Raw zone id (`Events.EVENT_TIMEZONE`), e.g. "Europe/Berlin"; null if unset. */
+    val eventTimezone: String? = null,
+    /** This device user's own response (`Events.SELF_ATTENDEE_STATUS`). */
+    val selfStatus: AttendeeStatus = AttendeeStatus.Unknown,
 )
 
 data class Attendee(
     val name: String,
     val email: String?,
     val status: AttendeeStatus,
+    /** Organizer / performer / speaker / plain attendee (`ATTENDEE_RELATIONSHIP`). */
+    val relationship: AttendeeRelationship = AttendeeRelationship.None,
+    /** Required / optional / resource (`ATTENDEE_TYPE`). */
+    val type: AttendeeType = AttendeeType.None,
+)
+
+data class Reminder(
+    /** Lead time before the event start, in minutes. `-1` means the provider default. */
+    val minutes: Int,
+    val method: ReminderMethod,
 )
 
 enum class AttendeeStatus {
@@ -45,6 +73,48 @@ enum class AttendeeStatus {
     Unknown,
 }
 
+enum class AttendeeRelationship {
+    Organizer,
+    Attendee,
+    Performer,
+    Speaker,
+    None,
+}
+
+enum class AttendeeType {
+    Required,
+    Optional,
+    Resource,
+    None,
+}
+
+enum class ReminderMethod {
+    Alert,
+    Email,
+    Sms,
+    Alarm,
+    Default,
+}
+
+enum class EventStatus {
+    Confirmed,
+    Tentative,
+    Cancelled,
+}
+
+enum class Availability {
+    Busy,
+    Free,
+    Tentative,
+}
+
+enum class AccessLevel {
+    Default,
+    Public,
+    Private,
+    Confidential,
+}
+
 enum class FailureReason {
     PermissionRevoked,
     NoCalendarsConfigured,

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

@@ -19,7 +19,9 @@ 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.month.MonthScreen
+import de.jeanlucmakiola.calendula.ui.settings.SettingsScreen
 import de.jeanlucmakiola.calendula.ui.week.WeekScreen
 import kotlinx.datetime.LocalDate
 
@@ -30,7 +32,7 @@ import kotlinx.datetime.LocalDate
  */
 @Composable
 fun CalendarHost(modifier: Modifier = Modifier) {
-    var view by rememberSaveable { mutableStateOf(CalendarView.Month) }
+    var view by rememberSaveable { mutableStateOf(CalendarView.Week) }
     val onSelectView: (CalendarView) -> Unit = { view = it }
 
     // Tapping a day in the month grid opens the day view anchored to that date.
@@ -59,6 +61,21 @@ fun CalendarHost(modifier: Modifier = Modifier) {
         detailKey = key
     }
 
+    // Settings (M4) is hoisted here so it overlays whichever calendar view is
+    // active and survives view switches. (The calendar filter now lives inline
+    // in the navigation drawer, so no overlay state is needed for it.)
+    var showSettings by rememberSaveable { mutableStateOf(false) }
+    val onOpenSettings = { showSettings = true }
+
+    // Event form (v1.2 create) — same held-key pattern as the detail screen:
+    // [heldCreateIso] keeps the prefill date alive through the slide-out.
+    var createDateIso by rememberSaveable { mutableStateOf<String?>(null) }
+    var heldCreateIso by remember { mutableStateOf<String?>(null) }
+    val onCreateEvent: (LocalDate) -> Unit = { date ->
+        heldCreateIso = date.toString()
+        createDateIso = date.toString()
+    }
+
     val slideSpec = rememberCalendarSlideSpec()
 
     Box(modifier = modifier.fillMaxSize()) {
@@ -67,17 +84,23 @@ fun CalendarHost(modifier: Modifier = Modifier) {
                 selectedView = view,
                 onSelectView = onSelectView,
                 onEventClick = onEventClick,
+                onOpenSettings = onOpenSettings,
+                onCreateEvent = onCreateEvent,
             )
             CalendarView.Day -> DayScreen(
                 selectedView = view,
                 onSelectView = onSelectView,
                 onEventClick = onEventClick,
+                onOpenSettings = onOpenSettings,
+                onCreateEvent = onCreateEvent,
                 initialDateIso = pendingDayIso,
             )
             CalendarView.Month -> MonthScreen(
                 selectedView = view,
                 onSelectView = onSelectView,
                 onOpenDay = onOpenDay,
+                onOpenSettings = onOpenSettings,
+                onCreateEvent = onCreateEvent,
             )
         }
 
@@ -97,5 +120,28 @@ fun CalendarHost(modifier: Modifier = Modifier) {
                 )
             }
         }
+
+        // Event form (v1.2) — full-screen destination, slides over the calendar.
+        AnimatedVisibility(
+            visible = createDateIso != null,
+            enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
+            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+        ) {
+            (createDateIso ?: heldCreateIso)?.let { iso ->
+                EventEditScreen(
+                    initialDateIso = iso,
+                    onClose = { createDateIso = null },
+                )
+            }
+        }
+
+        // Settings (M4) — full-screen destination, slides over the calendar.
+        AnimatedVisibility(
+            visible = showSettings,
+            enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
+            exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
+        ) {
+            SettingsScreen(onBack = { showSettings = false })
+        }
     }
 }

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

@@ -1,9 +1,15 @@
 package de.jeanlucmakiola.calendula.ui.common
 
+import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Settings
+import androidx.compose.material.icons.filled.Today
 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
@@ -13,20 +19,28 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import de.jeanlucmakiola.calendula.R
+import de.jeanlucmakiola.calendula.ui.filter.CalendarFilterList
 
 /**
- * Navigation drawer shared by every top-level calendar screen (M2/M3/M4
+ * Navigation drawer shared by every top-level calendar screen.
- * entry points). Stateless — the host screen owns the drawer state and wires
+ *
- * the callbacks.
+ * Visual language (kept deliberately small so sizes don't drift):
+ *  - Drawer title — `titleLarge`
+ *  - Section headers (e.g. "Calendars") — `titleSmall`, primary, text only
+ *  - Nav items (Today / Settings) — Material `NavigationDrawerItem`
+ *    (`labelLarge` label + a single 24dp leading icon)
+ *
+ * Hosts the per-calendar visibility filter (M3) inline — the calendar list with
+ * its checkboxes lives here rather than in a separate sheet — plus the "today"
+ * jump and a Settings entry (M4). The host screen owns the drawer state.
  */
 @Composable
 fun CalendarDrawer(
     onToday: () -> Unit,
-    onJumpToDate: () -> Unit,
-    onFilter: () -> Unit,
     onSettings: () -> Unit,
 ) {
     ModalDrawerSheet {
+        Column(Modifier.fillMaxHeight()) {
             Text(
                 text = stringResource(R.string.app_name),
                 style = MaterialTheme.typography.titleLarge,
@@ -35,31 +49,42 @@ fun CalendarDrawer(
             HorizontalDivider()
             Spacer(Modifier.height(8.dp))
             NavigationDrawerItem(
+                icon = { Icon(Icons.Filled.Today, contentDescription = null) },
                 label = { Text(stringResource(R.string.month_today_action)) },
                 selected = false,
                 onClick = onToday,
                 modifier = Modifier.padding(horizontal = 12.dp),
             )
-        NavigationDrawerItem(
-            label = { Text(stringResource(R.string.month_action_jump_to_date)) },
-            selected = false,
-            onClick = onJumpToDate,
-            modifier = Modifier.padding(horizontal = 12.dp),
-        )
-        NavigationDrawerItem(
-            label = { Text(stringResource(R.string.month_action_filter)) },
-            selected = false,
-            onClick = onFilter,
-            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))
         }
     }
+}
+
+/** Top-level grouping label in the drawer. Text only, so it never reads as a
+ *  tappable nav item. */
+@Composable
+private fun DrawerSectionHeader(text: String) {
+    Text(
+        text = text,
+        style = MaterialTheme.typography.titleSmall,
+        color = MaterialTheme.colorScheme.primary,
+        modifier = Modifier.padding(start = 28.dp, end = 28.dp, top = 16.dp, bottom = 8.dp),
+    )
+}

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

@@ -0,0 +1,58 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.scaleIn
+import androidx.compose.animation.scaleOut
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Add
+import androidx.compose.material.icons.filled.Refresh
+import androidx.compose.material3.ExperimentalMaterial3ExpressiveApi
+import androidx.compose.material3.ExtendedFloatingActionButton
+import androidx.compose.material3.FloatingActionButton
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import de.jeanlucmakiola.calendula.R
+
+/**
+ * The FAB stack shared by the three calendar views: a persistent "+" to
+ * create an event, with the jump-to-today pill appearing above it whenever
+ * the view isn't anchored on today.
+ */
+@OptIn(ExperimentalMaterial3ExpressiveApi::class)
+@Composable
+fun CalendarFabColumn(
+    todayVisible: Boolean,
+    todayText: String,
+    onToday: () -> Unit,
+    onCreate: () -> Unit,
+) {
+    Column(
+        horizontalAlignment = Alignment.End,
+        verticalArrangement = Arrangement.spacedBy(16.dp),
+    ) {
+        AnimatedVisibility(
+            visible = todayVisible,
+            enter = scaleIn(MaterialTheme.motionScheme.fastSpatialSpec()),
+            exit = scaleOut(MaterialTheme.motionScheme.fastSpatialSpec()),
+        ) {
+            ExtendedFloatingActionButton(
+                onClick = onToday,
+                icon = { Icon(Icons.Default.Refresh, contentDescription = null) },
+                text = { Text(todayText) },
+            )
+        }
+        FloatingActionButton(onClick = onCreate) {
+            Icon(
+                imageVector = Icons.Default.Add,
+                contentDescription = stringResource(R.string.event_edit_new_title),
+            )
+        }
+    }
+}

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

@@ -0,0 +1,94 @@
+package de.jeanlucmakiola.calendula.ui.common
+
+import androidx.compose.foundation.layout.Column
+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.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.RoundedCornerShape
+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.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.isSpecified
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.unit.dp
+
+/**
+ * The app's standard pick in a selection dialog: a full-width tonal card,
+ * optionally with a leading icon and a supporting line; the selected option
+ * is highlighted. Stack with 8dp gaps inside an AlertDialog — this is the
+ * only sanctioned selection-modal style (no radio rows, no bare text lists).
+ */
+@Composable
+fun OptionCard(
+    label: String,
+    onClick: () -> Unit,
+    modifier: Modifier = Modifier,
+    icon: ImageVector? = null,
+    /** Icon tint override, e.g. a calendar colour; unspecified follows selection. */
+    iconTint: Color = Color.Unspecified,
+    supportingText: String? = null,
+    selected: Boolean = false,
+    /** Label colour override, e.g. primary for an emphasised "Custom" entry. */
+    labelColor: Color = Color.Unspecified,
+) {
+    val contentColor = if (selected) {
+        MaterialTheme.colorScheme.onSecondaryContainer
+    } else {
+        MaterialTheme.colorScheme.onSurface
+    }
+    Surface(
+        onClick = onClick,
+        color = if (selected) {
+            MaterialTheme.colorScheme.secondaryContainer
+        } else {
+            MaterialTheme.colorScheme.surfaceContainerHighest
+        },
+        shape = RoundedCornerShape(12.dp),
+        modifier = modifier.fillMaxWidth(),
+    ) {
+        Row(
+            verticalAlignment = Alignment.CenterVertically,
+            modifier = Modifier.padding(horizontal = 16.dp, vertical = 14.dp),
+        ) {
+            if (icon != null) {
+                Icon(
+                    imageVector = icon,
+                    contentDescription = null,
+                    tint = when {
+                        iconTint.isSpecified -> iconTint
+                        selected -> MaterialTheme.colorScheme.onSecondaryContainer
+                        else -> MaterialTheme.colorScheme.onSurfaceVariant
+                    },
+                    modifier = Modifier.size(20.dp),
+                )
+                Spacer(Modifier.width(12.dp))
+            }
+            Column {
+                Text(
+                    text = label,
+                    style = MaterialTheme.typography.titleMedium,
+                    color = if (labelColor.isSpecified) labelColor else contentColor,
+                )
+                if (supportingText != null) {
+                    Text(
+                        text = supportingText,
+                        style = MaterialTheme.typography.bodySmall,
+                        color = if (selected) {
+                            MaterialTheme.colorScheme.onSecondaryContainer.copy(alpha = 0.8f)
+                        } else {
+                            MaterialTheme.colorScheme.onSurfaceVariant
+                        },
+                    )
+                }
+            }
+        }
+    }
+}

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

@@ -1,11 +1,8 @@
 package de.jeanlucmakiola.calendula.ui.day
 
 import androidx.compose.animation.AnimatedContent
-import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.animateColorAsState
 import androidx.compose.animation.core.animateDpAsState
-import androidx.compose.animation.scaleIn
-import androidx.compose.animation.scaleOut
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.gestures.detectHorizontalDragGestures
@@ -28,12 +25,10 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Menu
-import androidx.compose.material.icons.filled.Refresh
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
 import androidx.compose.material3.DrawerValue
 import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.ExtendedFloatingActionButton
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
@@ -72,6 +67,7 @@ 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.ViewSwitcherPill
@@ -107,6 +103,8 @@ fun DayScreen(
     selectedView: CalendarView,
     onSelectView: (CalendarView) -> Unit,
     onEventClick: (EventInstance) -> Unit,
+    onOpenSettings: () -> Unit,
+    onCreateEvent: (LocalDate) -> Unit,
     modifier: Modifier = Modifier,
     initialDateIso: String? = null,
     viewModel: DayViewModel = hiltViewModel(),
@@ -143,7 +141,15 @@ fun DayScreen(
     var slideDir by remember { mutableIntStateOf(0) }
     val goNext = { slideDir = 1; viewModel.goToNext() }
     val goPrev = { slideDir = -1; viewModel.goToPrev() }
-    val jumpToToday = { slideDir = 0; viewModel.goToToday() }
+    // Slide toward today: viewing the future → today comes in from the left
+    // (back), viewing the past → from the right (forward).
+    val jumpToToday = {
+        slideDir = when (val s = state) {
+            is DayUiState.Success -> if (s.today < s.date) -1 else 1
+            else -> 0
+        }
+        viewModel.goToToday()
+    }
 
     ModalNavigationDrawer(
         drawerState = drawerState,
@@ -152,9 +158,10 @@ fun DayScreen(
         drawerContent = {
             CalendarDrawer(
                 onToday = { jumpToToday(); scope.launch { drawerState.close() } },
-                onJumpToDate = { scope.launch { drawerState.close() } /* TODO: date picker */ },
+                onSettings = {
-                onFilter = { scope.launch { drawerState.close() } /* TODO: filter sheet */ },
+                    onOpenSettings()
-                onSettings = { scope.launch { drawerState.close() } /* TODO: settings */ },
+                    scope.launch { drawerState.close() }
+                },
             )
         },
     ) {
@@ -170,17 +177,12 @@ fun DayScreen(
                 )
             },
             floatingActionButton = {
-                AnimatedVisibility(
+                CalendarFabColumn(
-                    visible = !isOnToday,
+                    todayVisible = !isOnToday,
-                    enter = scaleIn(),
+                    todayText = stringResource(R.string.day_today_action),
-                    exit = scaleOut(),
+                    onToday = jumpToToday,
-                ) {
+                    onCreate = { onCreateEvent(date) },
-                    ExtendedFloatingActionButton(
-                        onClick = jumpToToday,
-                        icon = { Icon(Icons.Default.Refresh, contentDescription = null) },
-                        text = { Text(stringResource(R.string.day_today_action)) },
                 )
-                }
             },
         ) { innerPadding ->
             DayContent(

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

@@ -1,11 +1,15 @@
 package de.jeanlucmakiola.calendula.ui.detail
 
+import android.Manifest
 import android.content.ActivityNotFoundException
 import android.content.Context
 import android.content.Intent
+import android.content.pm.PackageManager
 import android.icu.text.ListFormatter
 import android.net.Uri
 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.clickable
 import androidx.compose.foundation.isSystemInDarkTheme
@@ -13,6 +17,8 @@ import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.layout.ExperimentalLayoutApi
+import androidx.compose.foundation.layout.FlowRow
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
@@ -29,43 +35,65 @@ import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material.icons.automirrored.filled.Notes
 import androidx.compose.material.icons.filled.CalendarMonth
 import androidx.compose.material.icons.filled.Delete
-import androidx.compose.material.icons.filled.Edit
+import androidx.compose.material.icons.filled.Notifications
 import androidx.compose.material.icons.filled.People
 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.material3.AlertDialog
 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.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.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
 import androidx.compose.ui.text.SpanStyle
+import androidx.compose.ui.text.TextLinkStyles
 import androidx.compose.ui.text.buildAnnotatedString
 import androidx.compose.ui.text.font.FontStyle
 import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextDecoration
 import androidx.compose.ui.unit.Dp
 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.AccessLevel
 import de.jeanlucmakiola.calendula.domain.Attendee
+import de.jeanlucmakiola.calendula.domain.AttendeeRelationship
 import de.jeanlucmakiola.calendula.domain.AttendeeStatus
+import de.jeanlucmakiola.calendula.domain.AttendeeType
+import de.jeanlucmakiola.calendula.domain.Availability
 import de.jeanlucmakiola.calendula.domain.EventInstance
+import de.jeanlucmakiola.calendula.domain.EventStatus
+import de.jeanlucmakiola.calendula.domain.Reminder
 import de.jeanlucmakiola.calendula.ui.common.CalendarFailure
+import de.jeanlucmakiola.calendula.ui.common.OptionCard
+import de.jeanlucmakiola.calendula.ui.common.currentLocale
 import de.jeanlucmakiola.calendula.ui.common.pastelize
 import kotlinx.datetime.TimeZone
 import java.time.DayOfWeek
@@ -78,10 +106,10 @@ import kotlin.time.Duration.Companion.seconds
 import kotlin.time.Instant
 
 /**
- * Read-only full-screen event detail (spec S4, realised as a navigation
+ * Full-screen event detail (spec S4, realised as a navigation destination
- * destination rather than a bottom sheet — MD3 list→detail pattern). Back
+ * rather than a bottom sheet — MD3 list→detail pattern). Back gesture and the
- * gesture and the top-bar arrow both return to the calendar. The only action is
+ * top-bar arrow both return to the calendar. Events in writable calendars can
- * tapping the location to open a maps intent.
+ * be deleted from here (v1.1); edit follows in v1.3.
  */
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -96,10 +124,55 @@ fun EventDetailScreen(
         viewModel.open(eventId, beginMillis, endMillis)
     }
     val state by viewModel.state.collectAsStateWithLifecycle()
+    val deleteState by viewModel.deleteState.collectAsStateWithLifecycle()
 
     BackHandler(onBack = onBack)
 
+    val context = LocalContext.current
+    val snackbarHostState = remember { SnackbarHostState() }
+    var showDeleteDialog by rememberSaveable { mutableStateOf(false) }
+
+    // v1.0 installs only hold READ_CALENDAR; the first write asks for the
+    // upgrade in place. Granting continues straight into the confirm dialog.
+    val writePermissionLauncher = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.RequestPermission(),
+    ) { granted ->
+        if (granted) showDeleteDialog = true
+    }
+    val onDeleteClick = {
+        val granted = ContextCompat.checkSelfPermission(
+            context,
+            Manifest.permission.WRITE_CALENDAR,
+        ) == PackageManager.PERMISSION_GRANTED
+        if (granted) {
+            showDeleteDialog = true
+        } else {
+            writePermissionLauncher.launch(Manifest.permission.WRITE_CALENDAR)
+        }
+    }
+
+    val deleteFailedMessage = stringResource(R.string.event_delete_failed)
+    val writeDeniedMessage = stringResource(R.string.event_delete_write_denied)
+    LaunchedEffect(deleteState) {
+        when (deleteState) {
+            DeleteUiState.Deleted -> {
+                viewModel.consumeDeleteResult()
+                onBack()
+            }
+            DeleteUiState.Failed -> {
+                viewModel.consumeDeleteResult()
+                snackbarHostState.showSnackbar(deleteFailedMessage)
+            }
+            DeleteUiState.NeedsPermission -> {
+                viewModel.consumeDeleteResult()
+                snackbarHostState.showSnackbar(writeDeniedMessage)
+            }
+            DeleteUiState.Idle, DeleteUiState.Deleting -> Unit
+        }
+    }
+
     Scaffold(
+        snackbarHost = { SnackbarHost(snackbarHostState) },
         topBar = {
             TopAppBar(
                 title = {},
@@ -112,18 +185,20 @@ fun EventDetailScreen(
                     }
                 },
                 actions = {
-                    IconButton(onClick = { /* TODO: edit event (V2) */ }) {
+                    // Only writable calendars get actions — WebCal subscriptions,
-                        Icon(
+                    // birthday calendars etc. are read-only at the provider level.
-                            imageVector = Icons.Default.Edit,
+                    val s = state
-                            contentDescription = stringResource(R.string.event_detail_edit),
+                    if (s is EventDetailUiState.Success && s.canModify) {
-                        )
+                        IconButton(
-                    }
+                            onClick = onDeleteClick,
-                    IconButton(onClick = { /* TODO: delete event (V2) */ }) {
+                            enabled = deleteState != DeleteUiState.Deleting,
+                        ) {
                             Icon(
                                 imageVector = Icons.Default.Delete,
                                 contentDescription = stringResource(R.string.event_detail_delete),
                             )
                         }
+                    }
                 },
                 colors = TopAppBarDefaults.topAppBarColors(
                     containerColor = MaterialTheme.colorScheme.surface,
@@ -143,7 +218,75 @@ fun EventDetailScreen(
             is EventDetailUiState.Success -> EventDetailContent(s, contentModifier)
         }
     }
+
+    val loaded = state
+    if (showDeleteDialog && loaded is EventDetailUiState.Success) {
+        DeleteEventDialog(
+            isRecurring = !loaded.detail.rrule.isNullOrBlank(),
+            onConfirm = { wholeSeries ->
+                showDeleteDialog = false
+                viewModel.delete(wholeSeries)
+            },
+            onDismiss = { showDeleteDialog = false },
+        )
     }
+}
+
+/**
+ * Delete confirmation. Recurring events choose between cancelling just the
+ * tapped occurrence (default) and removing the whole series.
+ */
+@Composable
+private fun DeleteEventDialog(
+    isRecurring: Boolean,
+    onConfirm: (wholeSeries: Boolean) -> Unit,
+    onDismiss: () -> Unit,
+) {
+    var wholeSeries by rememberSaveable { mutableStateOf(false) }
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = {
+            Text(
+                stringResource(
+                    if (isRecurring) R.string.event_delete_recurring_title
+                    else R.string.event_delete_title,
+                ),
+            )
+        },
+        text = {
+            if (isRecurring) {
+                Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
+                    OptionCard(
+                        label = stringResource(R.string.event_delete_option_occurrence),
+                        onClick = { wholeSeries = false },
+                        selected = !wholeSeries,
+                    )
+                    OptionCard(
+                        label = stringResource(R.string.event_delete_option_series),
+                        onClick = { wholeSeries = true },
+                        selected = wholeSeries,
+                    )
+                }
+            } else {
+                Text(stringResource(R.string.event_delete_body))
+            }
+        },
+        confirmButton = {
+            TextButton(onClick = { onConfirm(if (isRecurring) wholeSeries else true) }) {
+                Text(
+                    text = stringResource(R.string.event_detail_delete),
+                    color = MaterialTheme.colorScheme.error,
+                )
+            }
+        },
+        dismissButton = {
+            TextButton(onClick = onDismiss) {
+                Text(stringResource(R.string.dialog_cancel))
+            }
+        },
+    )
+}
+
 
 @Composable
 private fun EventDetailContent(state: EventDetailUiState.Success, modifier: Modifier = Modifier) {
@@ -158,12 +301,30 @@ private fun EventDetailContent(state: EventDetailUiState.Success, modifier: Modi
             .verticalScroll(rememberScrollState())
             .padding(start = 24.dp, end = 24.dp, top = 8.dp, bottom = 40.dp),
     ) {
-        // Title with a short accent line in the calendar colour underneath.
+        // Title row: title on the left, a "Free" pill pinned top-right when the
+        // event doesn't block your time. Busy is the default for nearly every
+        // event, so it's left implicit — only Free is worth surfacing. A
+        // cancelled event strikes through its title.
+        Row(verticalAlignment = Alignment.Top) {
             Text(
                 text = instance.title.ifBlank { stringResource(R.string.event_untitled) },
                 style = MaterialTheme.typography.headlineMedium,
                 fontWeight = FontWeight.SemiBold,
+                textDecoration = if (detail.status == EventStatus.Cancelled) {
+                    TextDecoration.LineThrough
+                } else {
+                    null
+                },
+                modifier = Modifier.weight(1f),
             )
+            if (detail.availability == Availability.Free) {
+                Spacer(Modifier.width(12.dp))
+                InfoChip(
+                    text = stringResource(R.string.event_availability_free),
+                    modifier = Modifier.padding(top = 6.dp),
+                )
+            }
+        }
         Spacer(Modifier.height(10.dp))
         Box(
             modifier = Modifier
@@ -172,6 +333,16 @@ private fun EventDetailContent(state: EventDetailUiState.Success, modifier: Modi
                 .background(accent, RoundedCornerShape(2.dp)),
         )
 
+        // Status / access chips — shown only when noteworthy (Confirmed status
+        // and Default/Public access are the silent norm).
+        val hasStatusChips = detail.status != EventStatus.Confirmed ||
+            detail.accessLevel == AccessLevel.Private ||
+            detail.accessLevel == AccessLevel.Confidential
+        if (hasStatusChips) {
+            Spacer(Modifier.height(16.dp))
+            StatusChips(detail.status, detail.accessLevel)
+        }
+
         Spacer(Modifier.height(20.dp))
 
         // Every piece of info shares one card design: a tonal container with a
@@ -193,6 +364,18 @@ private fun EventDetailContent(state: EventDetailUiState.Success, modifier: Modi
             }
         }
 
+        // Time zone — only when the event is timed and pinned to a zone other
+        // than the device's, so cross-zone events read unambiguously.
+        foreignTimeZoneLabel(detail.eventTimezone, instance.isAllDay, locale)?.let { tzLabel ->
+            Spacer(Modifier.height(gap))
+            DetailCard(
+                icon = Icons.Default.Public,
+                iconContentDescription = stringResource(R.string.event_detail_timezone),
+            ) {
+                Text(text = tzLabel, style = MaterialTheme.typography.titleMedium)
+            }
+        }
+
         // Calendar — icon tinted in the calendar colour conveys identity, so no
         // separate colour dot is needed.
         Spacer(Modifier.height(gap))
@@ -227,28 +410,63 @@ private fun EventDetailContent(state: EventDetailUiState.Success, modifier: Modi
             }
         }
 
-        // Description (conditional).
+        // Description (conditional). URLs are auto-linked.
         detail.description?.takeIf { it.isNotBlank() }?.let { description ->
             Spacer(Modifier.height(gap))
             DetailCard(
                 icon = Icons.AutoMirrored.Filled.Notes,
                 iconContentDescription = stringResource(R.string.event_detail_description),
             ) {
-                Text(text = description, style = MaterialTheme.typography.bodyMedium)
+                Text(
+                    text = linkifyUrls(description, MaterialTheme.colorScheme.primary),
+                    style = MaterialTheme.typography.bodyMedium,
+                )
             }
         }
 
-        // Attendees (conditional).
+        // Attendees (conditional). The user's own response leads the list, then
+        // each attendee with their role and reply.
         detail.attendees.takeIf { it.isNotEmpty() }?.let { attendees ->
             Spacer(Modifier.height(gap))
             DetailCard(
                 icon = Icons.Default.People,
                 iconContentDescription = stringResource(R.string.event_detail_attendees),
             ) {
+                if (detail.selfStatus != AttendeeStatus.Unknown) {
+                    Text(
+                        text = stringResource(
+                            R.string.event_detail_self_response,
+                            stringResource(attendeeStatusLabel(detail.selfStatus)),
+                        ),
+                        style = MaterialTheme.typography.labelLarge,
+                        color = MaterialTheme.colorScheme.primary,
+                    )
+                    Spacer(Modifier.height(8.dp))
+                }
                 attendees.forEach { AttendeeRow(it) }
             }
         }
 
+        // Reminders (conditional) — list each lead time before the event.
+        detail.reminders.takeIf { it.isNotEmpty() }?.let { reminders ->
+            Spacer(Modifier.height(gap))
+            DetailCard(
+                icon = Icons.Default.Notifications,
+                iconContentDescription = stringResource(R.string.event_detail_reminders),
+            ) {
+                reminders
+                    .distinctBy { it.minutes }
+                    .sortedBy { it.minutes }
+                    .forEach { reminder ->
+                        Text(
+                            text = reminderLeadText(reminder),
+                            style = MaterialTheme.typography.titleMedium,
+                            modifier = Modifier.padding(vertical = 2.dp),
+                        )
+                    }
+            }
+        }
+
         // Recurrence (conditional) — humanised from the RRULE.
         detail.rrule?.takeIf { it.isNotBlank() }?.let { rrule ->
             Spacer(Modifier.height(gap))
@@ -303,10 +521,20 @@ private fun AttendeeRow(attendee: Attendee) {
         horizontalArrangement = Arrangement.SpaceBetween,
         verticalAlignment = Alignment.CenterVertically,
     ) {
+        Column(modifier = Modifier.weight(1f)) {
             Text(
                 text = attendee.name.ifBlank { attendee.email.orEmpty() },
                 style = MaterialTheme.typography.bodyMedium,
             )
+            attendeeRoleLabel(attendee)?.let { roleRes ->
+                Text(
+                    text = stringResource(roleRes),
+                    style = MaterialTheme.typography.labelSmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
+        }
+        Spacer(Modifier.width(8.dp))
         Text(
             text = stringResource(attendeeStatusLabel(attendee.status)),
             style = MaterialTheme.typography.labelSmall,
@@ -315,6 +543,54 @@ private fun AttendeeRow(attendee: Attendee) {
     }
 }
 
+/** Status / access pills shown directly under the title accent. */
+@OptIn(ExperimentalLayoutApi::class)
+@Composable
+private fun StatusChips(status: EventStatus, accessLevel: AccessLevel) {
+    FlowRow(
+        horizontalArrangement = Arrangement.spacedBy(8.dp),
+        verticalArrangement = Arrangement.spacedBy(8.dp),
+    ) {
+        when (status) {
+            EventStatus.Cancelled -> InfoChip(
+                text = stringResource(R.string.event_status_cancelled),
+                container = MaterialTheme.colorScheme.errorContainer,
+                content = MaterialTheme.colorScheme.onErrorContainer,
+            )
+            EventStatus.Tentative -> InfoChip(
+                text = stringResource(R.string.event_status_tentative),
+                container = MaterialTheme.colorScheme.tertiaryContainer,
+                content = MaterialTheme.colorScheme.onTertiaryContainer,
+            )
+            EventStatus.Confirmed -> Unit
+        }
+
+        when (accessLevel) {
+            AccessLevel.Private -> InfoChip(text = stringResource(R.string.event_access_private))
+            AccessLevel.Confidential ->
+                InfoChip(text = stringResource(R.string.event_access_confidential))
+            AccessLevel.Default, AccessLevel.Public -> Unit
+        }
+    }
+}
+
+@Composable
+private fun InfoChip(
+    text: String,
+    modifier: Modifier = Modifier,
+    container: Color = MaterialTheme.colorScheme.surfaceContainerHighest,
+    content: Color = MaterialTheme.colorScheme.onSurfaceVariant,
+) {
+    Surface(color = container, shape = RoundedCornerShape(8.dp), modifier = modifier) {
+        Text(
+            text = text,
+            style = MaterialTheme.typography.labelMedium,
+            color = content,
+            modifier = Modifier.padding(horizontal = 10.dp, vertical = 5.dp),
+        )
+    }
+}
+
 @Composable
 private fun EventDetailLoading(modifier: Modifier = Modifier) {
     Column(modifier = modifier.padding(start = 24.dp, end = 24.dp, top = 16.dp)) {
@@ -347,11 +623,10 @@ private fun SkeletonBar(widthFraction: Float, height: Dp) {
 
 // --- helpers -------------------------------------------------------------
 
+// Observable locale read (shared helper) — avoids NonObservableLocale /
+// LocalContextConfigurationRead lint by going through LocalConfiguration.
 @Composable
-private fun currentDetailLocale(): Locale {
+private fun currentDetailLocale(): Locale = currentLocale()
-    val config = LocalContext.current.resources.configuration
-    return config.locales[0] ?: Locale.getDefault()
-}
 
 private fun attendeeStatusLabel(status: AttendeeStatus): Int = when (status) {
     AttendeeStatus.Accepted -> R.string.event_attendee_accepted
@@ -361,6 +636,77 @@ private fun attendeeStatusLabel(status: AttendeeStatus): Int = when (status) {
     AttendeeStatus.Unknown -> R.string.event_attendee_unknown
 }
 
+/**
+ * The role badge shown under an attendee's name. Organizer wins over type;
+ * required attendees (the common case) get no badge to keep the list quiet.
+ */
+private fun attendeeRoleLabel(attendee: Attendee): Int? = when {
+    attendee.relationship == AttendeeRelationship.Organizer -> R.string.event_attendee_organizer
+    attendee.type == AttendeeType.Optional -> R.string.event_attendee_optional
+    attendee.type == AttendeeType.Resource -> R.string.event_attendee_resource
+    else -> null
+}
+
+/** 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)
+    }
+}
+
+/**
+ * A localized label for [tz] (e.g. "Central European Time (Europe/Berlin)"),
+ * but only when the event is timed and pinned to a zone different from the
+ * device's. Returns null when there's nothing worth showing.
+ */
+private fun foreignTimeZoneLabel(tz: String?, isAllDay: Boolean, locale: Locale): String? {
+    if (isAllDay || tz.isNullOrBlank()) return null
+    val deviceZone = ZoneId.systemDefault().id
+    if (tz == deviceZone) return null
+    return try {
+        val zone = ZoneId.of(tz)
+        val name = zone.getDisplayName(JavaTextStyle.FULL, locale)
+        if (name == tz) tz else "$name ($tz)"
+    } catch (e: Exception) {
+        tz
+    }
+}
+
+/** Wrap http(s) URLs in [text] as tappable links tinted [linkColor]. */
+@Composable
+private fun linkifyUrls(text: String, linkColor: Color): AnnotatedString = remember(text, linkColor) {
+    val regex = Regex("""https?://\S+""")
+    val styles = TextLinkStyles(
+        style = SpanStyle(color = linkColor, textDecoration = TextDecoration.Underline),
+    )
+    buildAnnotatedString {
+        append(text)
+        for (match in regex.findAll(text)) {
+            // Trim trailing punctuation that commonly abuts a URL in prose.
+            val raw = match.value
+            val url = raw.trimEnd('.', ',', ';', ':', '!', '?', ')', ']', '"', '\'')
+            val end = match.range.first + url.length
+            addLink(LinkAnnotation.Url(url, styles), match.range.first, end)
+        }
+    }
+}
+
 /**
  * Humanise an RFC 5545 RRULE into a localized phrase, e.g.
  * "Every week on Tue and Thu until 31 Dec 2026" or "Every day, 10 times".

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

@@ -4,7 +4,7 @@ import de.jeanlucmakiola.calendula.domain.EventDetail
 import de.jeanlucmakiola.calendula.domain.FailureReason
 
 /**
- * UI state for the event-detail bottom sheet (spec S4). Read-only in V1.
+ * UI state for the event-detail screen (spec S4).
  */
 sealed interface EventDetailUiState {
     data object Loading : EventDetailUiState
@@ -13,5 +13,20 @@ sealed interface EventDetailUiState {
         val detail: EventDetail,
         /** Display name of the owning calendar, null if it can't be resolved. */
         val calendarName: String?,
+        /** Whether the owning calendar allows modifying events (shows edit/delete). */
+        val canModify: Boolean = false,
     ) : EventDetailUiState
 }
+
+/**
+ * One-shot state of a delete request, separate from the screen state so a
+ * failed delete leaves the loaded detail visible.
+ */
+sealed interface DeleteUiState {
+    data object Idle : DeleteUiState
+    data object Deleting : DeleteUiState
+    data object Deleted : DeleteUiState
+    /** WRITE_CALENDAR was revoked between the tap and the provider call. */
+    data object NeedsPermission : DeleteUiState
+    data object Failed : DeleteUiState
+}

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

@@ -12,6 +12,7 @@ import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.flatMapLatest
@@ -19,6 +20,7 @@ import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
 import kotlin.coroutines.cancellation.CancellationException
 import kotlin.time.Instant
 import javax.inject.Inject
@@ -38,6 +40,9 @@ class EventDetailViewModel @Inject constructor(
     // Bumped by retry() to re-run the load for the same target.
     private val _reload = MutableStateFlow(0)
 
+    private val _deleteState = MutableStateFlow<DeleteUiState>(DeleteUiState.Idle)
+    val deleteState: StateFlow<DeleteUiState> = _deleteState.asStateFlow()
+
     val state: StateFlow<EventDetailUiState> =
         combine(_target, _reload) { target, _ -> target }
             .flatMapLatest { target ->
@@ -72,6 +77,38 @@ class EventDetailViewModel @Inject constructor(
         _reload.value += 1
     }
 
+    /**
+     * Delete the open event. [wholeSeries] is meaningful only for recurring
+     * events: false cancels just the tapped occurrence. Result lands in
+     * [deleteState]; the screen consumes it via [consumeDeleteResult].
+     */
+    fun delete(wholeSeries: Boolean) {
+        val target = _target.value ?: return
+        if (_deleteState.value == DeleteUiState.Deleting) return
+        viewModelScope.launch {
+            _deleteState.value = DeleteUiState.Deleting
+            _deleteState.value = try {
+                if (wholeSeries) {
+                    repository.deleteEvent(target.eventId)
+                } else {
+                    repository.deleteOccurrence(target.eventId, target.beginMillis)
+                }
+                DeleteUiState.Deleted
+            } catch (e: CancellationException) {
+                throw e
+            } catch (e: SecurityException) {
+                DeleteUiState.NeedsPermission
+            } catch (e: Exception) {
+                DeleteUiState.Failed
+            }
+        }
+    }
+
+    /** Reset [deleteState] after the screen handled a terminal result. */
+    fun consumeDeleteResult() {
+        _deleteState.value = DeleteUiState.Idle
+    }
+
     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
@@ -82,10 +119,13 @@ class EventDetailViewModel @Inject constructor(
                 end = Instant.fromEpochMilliseconds(target.endMillis),
             ),
         )
-        val calendarName = repository.calendars().first()
+        val calendar = repository.calendars().first()
             .firstOrNull { it.id == corrected.instance.calendarId }
-            ?.displayName
+        EventDetailUiState.Success(
-        EventDetailUiState.Success(corrected, calendarName)
+            detail = corrected,
+            calendarName = calendar?.displayName,
+            canModify = calendar?.canModifyContents == true,
+        )
     } catch (e: CancellationException) {
         throw e
     } catch (e: NoSuchEventException) {

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

@@ -0,0 +1,34 @@
+package de.jeanlucmakiola.calendula.ui.edit
+
+import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.EventForm
+import de.jeanlucmakiola.calendula.domain.EventFormField
+import de.jeanlucmakiola.calendula.domain.EventFormProblem
+
+/**
+ * UI state for the event form (v1.2: create; v1.3 reuses it for edit). Null
+ * form means the screen hasn't been opened yet.
+ */
+data class EventEditUiState(
+    /** The form with its calendar id resolved (picked > last used > first writable). */
+    val form: EventForm,
+    /** Calendars that accept writes — the only valid targets. */
+    val calendars: List<CalendarSource>,
+    /** Validation problems; empty until a save was attempted. */
+    val problems: Set<EventFormProblem>,
+    val saveState: SaveUiState,
+    /** Optional sections currently rendered (settings defaults ∪ revealed). */
+    val visibleFields: Set<EventFormField> = emptySet(),
+    /** True while at least one optional section hides behind "more fields". */
+    val hasHiddenFields: Boolean = false,
+)
+
+/** One-shot state of a save request, mirroring DeleteUiState on the detail screen. */
+sealed interface SaveUiState {
+    data object Idle : SaveUiState
+    data object Saving : SaveUiState
+    data object Saved : SaveUiState
+    /** WRITE_CALENDAR was revoked between the tap and the provider call. */
+    data object NeedsPermission : SaveUiState
+    data object Failed : SaveUiState
+}

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

@@ -0,0 +1,202 @@
+package de.jeanlucmakiola.calendula.ui.edit
+
+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.prefs.CalendarPrefs
+import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
+import de.jeanlucmakiola.calendula.domain.AccessLevel
+import de.jeanlucmakiola.calendula.domain.Availability
+import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.EventForm
+import de.jeanlucmakiola.calendula.domain.EventFormField
+import de.jeanlucmakiola.calendula.domain.problems
+import kotlinx.coroutines.CoroutineDispatcher
+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.flowOn
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.LocalDateTime
+import kotlinx.datetime.LocalTime
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.toInstant
+import kotlinx.datetime.toLocalDateTime
+import kotlin.coroutines.cancellation.CancellationException
+import kotlin.time.Clock
+import kotlin.time.Duration.Companion.hours
+import kotlin.time.Instant
+import javax.inject.Inject
+
+/**
+ * Holds the event form being composed. The form's calendar id resolves to
+ * (user pick > last used > first writable); the resolved value is what the UI
+ * shows and what gets saved.
+ */
+@HiltViewModel
+class EventEditViewModel @Inject constructor(
+    private val repository: CalendarRepository,
+    private val prefs: CalendarPrefs,
+    private val settingsPrefs: SettingsPrefs,
+    @IoDispatcher private val io: CoroutineDispatcher,
+) : ViewModel() {
+
+    private val _form = MutableStateFlow<EventForm?>(null)
+    private val _saveState = MutableStateFlow<SaveUiState>(SaveUiState.Idle)
+    // Problems stay hidden until the first save attempt, so a half-filled
+    // form isn't already shouting errors.
+    private val _showProblems = MutableStateFlow(false)
+    // Fields added through the "more fields" picker; folds back on reset().
+    private val _revealed = MutableStateFlow<Set<EventFormField>>(emptySet())
+
+    private data class LocalInputs(
+        val form: EventForm?,
+        val saveState: SaveUiState,
+        val showProblems: Boolean,
+        val revealed: Set<EventFormField>,
+    )
+
+    private data class ExternalInputs(
+        val writable: List<CalendarSource>,
+        val lastUsed: Long?,
+        val defaultFields: Set<EventFormField>,
+    )
+
+    val state: StateFlow<EventEditUiState?> = combine(
+        combine(_form, _saveState, _showProblems, _revealed, ::LocalInputs),
+        combine(
+            repository.calendars()
+                .map { calendars -> calendars.filter { it.canModifyContents } }
+                .catch { emit(emptyList()) },
+            prefs.lastUsedCalendarId,
+            settingsPrefs.defaultFormFields,
+            ::ExternalInputs,
+        ),
+    ) { local, external ->
+        val form = local.form ?: return@combine null
+        val resolvedId = form.calendarId
+            ?: external.lastUsed?.takeIf { id -> external.writable.any { it.id == id } }
+            ?: external.writable.firstOrNull()?.id
+        val resolved = form.copy(calendarId = resolvedId)
+        val visibleFields = external.defaultFields + local.revealed
+        EventEditUiState(
+            form = resolved,
+            calendars = external.writable,
+            problems = if (local.showProblems) resolved.problems() else emptySet(),
+            saveState = local.saveState,
+            visibleFields = visibleFields,
+            hasHiddenFields = visibleFields.size < EventFormField.entries.size,
+        )
+    }
+        .flowOn(io)
+        .stateIn(
+            scope = viewModelScope,
+            started = SharingStarted.WhileSubscribed(5_000L),
+            initialValue = null,
+        )
+
+    /**
+     * 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.
+     */
+    fun openNew(date: LocalDate) {
+        if (_form.value != null) return
+        val zone = TimeZone.currentSystemDefault()
+        val now = Clock.System.now()
+        val start = if (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))
+        }
+        val end = (start.toInstant(zone) + 1.hours).toLocalDateTime(zone)
+        _form.value = EventForm(calendarId = null, start = start, end = end)
+    }
+
+    /** Forget the open form; the next [openNew] starts clean. */
+    fun reset() {
+        _form.value = null
+        _saveState.value = SaveUiState.Idle
+        _showProblems.value = false
+        _revealed.value = emptySet()
+    }
+
+    /** Unfold one optional field, picked in the "more fields" dialog. */
+    fun revealField(field: EventFormField) {
+        _revealed.value = _revealed.value + field
+    }
+
+    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 setAvailability(value: Availability) = update { it.copy(availability = value) }
+    fun setAccessLevel(value: AccessLevel) = update { it.copy(accessLevel = value) }
+
+    fun addReminder(minutes: Int) = update {
+        it.copy(reminders = (it.reminders + minutes).distinct().sorted())
+    }
+
+    fun removeReminder(minutes: Int) = update {
+        it.copy(reminders = it.reminders - minutes)
+    }
+
+    /** Moving the start drags the end along, preserving the duration. */
+    fun setStartDate(date: LocalDate) = moveStart { LocalDateTime(date, it.time) }
+    fun setStartTime(time: LocalTime) = moveStart { LocalDateTime(it.date, time) }
+    fun setEndDate(date: LocalDate) = update { it.copy(end = LocalDateTime(date, it.end.time)) }
+    fun setEndTime(time: LocalTime) = update { it.copy(end = LocalDateTime(it.end.date, time)) }
+
+    /** Validate and write. Terminal results land in [saveState]. */
+    fun save() {
+        val current = state.value ?: return
+        if (current.saveState == SaveUiState.Saving) return
+        val form = current.form
+        if (form.problems().isNotEmpty()) {
+            _showProblems.value = true
+            return
+        }
+        viewModelScope.launch {
+            _saveState.value = SaveUiState.Saving
+            _saveState.value = try {
+                repository.createEvent(form)
+                prefs.setLastUsedCalendarId(requireNotNull(form.calendarId))
+                SaveUiState.Saved
+            } catch (e: CancellationException) {
+                throw e
+            } catch (e: SecurityException) {
+                SaveUiState.NeedsPermission
+            } catch (e: Exception) {
+                SaveUiState.Failed
+            }
+        }
+    }
+
+    /** Reset [saveState] after the screen handled a terminal result. */
+    fun consumeSaveResult() {
+        _saveState.value = SaveUiState.Idle
+    }
+
+    private fun moveStart(transform: (LocalDateTime) -> LocalDateTime) = update { form ->
+        val zone = TimeZone.currentSystemDefault()
+        val newStart = transform(form.start)
+        val duration = form.end.toInstant(zone) - form.start.toInstant(zone)
+        val newEnd = (newStart.toInstant(zone) + duration).toLocalDateTime(zone)
+        form.copy(start = newStart, end = newEnd)
+    }
+
+    private inline fun update(block: (EventForm) -> EventForm) {
+        _form.value = _form.value?.let(block)
+    }
+}

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

@@ -0,0 +1,154 @@
+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
+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.FailureReason
+import de.jeanlucmakiola.calendula.ui.common.pastelize
+
+/**
+ * Calendar-visibility filter (M3), rendered inline in the navigation drawer.
+ * Every calendar grouped by account, each with a colour swatch and a visibility
+ * switch; toggling writes straight to DataStore and every calendar view
+ * re-filters live. Three states (Loading / Failure / Success).
+ */
+@Composable
+fun CalendarFilterList(
+    modifier: Modifier = Modifier,
+    viewModel: FilterViewModel = hiltViewModel(),
+) {
+    val state by viewModel.state.collectAsStateWithLifecycle()
+    when (val s = state) {
+        FilterUiState.Loading -> FilterLoading(modifier)
+        is FilterUiState.Failure -> FilterMessage(s.reason, modifier)
+        is FilterUiState.Success -> FilterList(
+            groups = s.groups,
+            onSetVisible = viewModel::setVisible,
+            modifier = modifier,
+        )
+    }
+}
+
+@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),
+    ) {
+        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,
+                    onCheckedChange = { onSetVisible(cal.id, it) },
+                )
+            }
+        }
+    }
+}
+
+@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(
+        modifier = modifier.fillMaxWidth(),
+        verticalArrangement = Arrangement.spacedBy(8.dp),
+    ) {
+        repeat(4) {
+            Box(
+                modifier = Modifier
+                    .padding(horizontal = 28.dp)
+                    .fillMaxWidth()
+                    .height(36.dp)
+                    .background(
+                        MaterialTheme.colorScheme.surfaceContainerHigh,
+                        MaterialTheme.shapes.medium,
+                    ),
+            )
+        }
+    }
+}
+
+@Composable
+private fun FilterMessage(reason: FailureReason, modifier: Modifier = Modifier) {
+    val msg = when (reason) {
+        FailureReason.NoCalendarsConfigured -> R.string.state_failure_no_calendars
+        FailureReason.PermissionRevoked -> R.string.state_failure_permission
+        else -> R.string.state_failure_provider
+    }
+    Text(
+        text = stringResource(msg),
+        style = MaterialTheme.typography.bodyMedium,
+        color = MaterialTheme.colorScheme.onSurfaceVariant,
+        textAlign = TextAlign.Center,
+        modifier = modifier
+            .fillMaxWidth()
+            .padding(horizontal = 28.dp, vertical = 24.dp),
+    )
+}

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

@@ -0,0 +1,27 @@
+package de.jeanlucmakiola.calendula.ui.filter
+
+import de.jeanlucmakiola.calendula.domain.FailureReason
+
+/**
+ * State for the calendar-filter sheet (M3). The user toggles per-calendar
+ * visibility; the choice is persisted app-side (separate from the system's
+ * VISIBLE flag) and applied to every calendar view.
+ */
+sealed interface FilterUiState {
+    data object Loading : FilterUiState
+    data class Failure(val reason: FailureReason) : FilterUiState
+    data class Success(val groups: List<AccountGroup>) : FilterUiState
+}
+
+/** Calendars grouped under the account that owns them (Nextcloud / Local / …). */
+data class AccountGroup(
+    val account: String,
+    val calendars: List<CalendarRow>,
+)
+
+data class CalendarRow(
+    val id: Long,
+    val displayName: String,
+    val color: Int,
+    val visible: Boolean,
+)

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

@@ -0,0 +1,85 @@
+package de.jeanlucmakiola.calendula.ui.filter
+
+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.prefs.CalendarPrefs
+import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.FailureReason
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.catch
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
+import javax.inject.Inject
+
+@HiltViewModel
+class FilterViewModel @Inject constructor(
+    private val repository: CalendarRepository,
+    private val prefs: CalendarPrefs,
+    @IoDispatcher private val io: CoroutineDispatcher,
+) : ViewModel() {
+
+    val state: StateFlow<FilterUiState> =
+        combine(
+            repository.calendars(),
+            prefs.hiddenCalendarIds,
+        ) { calendars, hidden ->
+            if (calendars.isEmpty()) {
+                FilterUiState.Failure(FailureReason.NoCalendarsConfigured)
+            } else {
+                FilterUiState.Success(groupByAccount(calendars, hidden))
+            }
+        }
+            .catch { emit(FilterUiState.Failure(FailureReason.ProviderUnavailable)) }
+            .flowOn(io)
+            .stateIn(
+                scope = viewModelScope,
+                started = SharingStarted.WhileSubscribed(5_000L),
+                initialValue = FilterUiState.Loading,
+            )
+
+    /** Show or hide a single calendar; persists the new hidden set. */
+    fun setVisible(calendarId: Long, visible: Boolean) {
+        viewModelScope.launch {
+            val current = prefs.hiddenCalendarIds.first()
+            val next = if (visible) current - calendarId else current + calendarId
+            if (next != current) prefs.setHiddenCalendarIds(next)
+        }
+    }
+}
+
+/**
+ * Group calendars under their owning account, preserving the provider's order
+ * within each group and ordering groups by first appearance. A calendar is
+ * "visible" when its id is *not* in [hidden].
+ */
+internal fun groupByAccount(
+    calendars: List<CalendarSource>,
+    hidden: Set<Long>,
+): List<AccountGroup> =
+    calendars
+        .groupBy { it.accountLabel() }
+        .map { (account, cals) ->
+            AccountGroup(
+                account = account,
+                calendars = cals.map { c ->
+                    CalendarRow(
+                        id = c.id,
+                        displayName = c.displayName,
+                        color = c.color,
+                        visible = c.id !in hidden,
+                    )
+                },
+            )
+        }
+
+/** Account header text: the account name, falling back to its type. */
+private fun CalendarSource.accountLabel(): String =
+    accountName.takeIf { it.isNotBlank() } ?: accountType.takeIf { it.isNotBlank() } ?: displayName

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

@@ -1,10 +1,7 @@
 package de.jeanlucmakiola.calendula.ui.month
 
 import androidx.compose.animation.AnimatedContent
-import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.core.animateFloatAsState
-import androidx.compose.animation.scaleIn
-import androidx.compose.animation.scaleOut
 import androidx.compose.foundation.background
 import androidx.compose.foundation.gestures.detectHorizontalDragGestures
 import androidx.compose.foundation.interaction.MutableInteractionSource
@@ -23,13 +20,11 @@ import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Menu
-import androidx.compose.material.icons.filled.Refresh
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
 import androidx.compose.material3.DrawerValue
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.ExperimentalMaterial3ExpressiveApi
-import androidx.compose.material3.ExtendedFloatingActionButton
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
@@ -62,6 +57,7 @@ import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import de.jeanlucmakiola.calendula.R
 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.ViewSwitcherPill
@@ -74,8 +70,11 @@ import kotlinx.coroutines.launch
 import kotlinx.datetime.DateTimeUnit
 import kotlinx.datetime.DayOfWeek
 import kotlinx.datetime.LocalDate
+import kotlinx.datetime.TimeZone
 import kotlinx.datetime.YearMonth
 import kotlinx.datetime.plus
+import kotlinx.datetime.toLocalDateTime
+import kotlin.time.Clock
 import java.time.format.TextStyle as JavaTextStyle
 import java.util.Locale
 
@@ -85,11 +84,14 @@ fun MonthScreen(
     selectedView: CalendarView,
     onSelectView: (CalendarView) -> Unit,
     onOpenDay: (LocalDate) -> Unit,
+    onOpenSettings: () -> Unit,
+    onCreateEvent: (LocalDate) -> Unit,
     modifier: Modifier = Modifier,
     viewModel: MonthViewModel = hiltViewModel(),
 ) {
     val state by viewModel.state.collectAsStateWithLifecycle()
     val month by viewModel.month.collectAsStateWithLifecycle()
+    val weekStart by viewModel.weekStart.collectAsStateWithLifecycle()
 
     val scrollBehavior = TopAppBarDefaults.pinnedScrollBehavior()
     val drawerState = rememberDrawerState(DrawerValue.Closed)
@@ -111,8 +113,14 @@ fun MonthScreen(
         slideDir = -1
         viewModel.goToPrev()
     }
+    // Slide toward today: viewing the future → today comes in from the left
+    // (back), viewing the past → from the right (forward).
     val jumpToToday = {
-        slideDir = 0
+        slideDir = when (val s = state) {
+            is MonthUiState.Success ->
+                if (YearMonth(s.today.year, s.today.month) < s.month) -1 else 1
+            else -> 0
+        }
         viewModel.goToToday()
     }
 
@@ -126,9 +134,10 @@ fun MonthScreen(
                     jumpToToday()
                     scope.launch { drawerState.close() }
                 },
-                onJumpToDate = { scope.launch { drawerState.close() } /* TODO: open date picker */ },
+                onSettings = {
-                onFilter = { scope.launch { drawerState.close() } /* TODO: open filter sheet */ },
+                    onOpenSettings()
-                onSettings = { scope.launch { drawerState.close() } /* TODO: navigate to settings */ },
+                    scope.launch { drawerState.close() }
+                },
             )
         },
     ) {
@@ -144,17 +153,20 @@ fun MonthScreen(
                 )
             },
             floatingActionButton = {
-                AnimatedVisibility(
+                CalendarFabColumn(
-                    visible = !isOnCurrentMonth,
+                    todayVisible = !isOnCurrentMonth,
-                    enter = scaleIn(),
+                    todayText = stringResource(R.string.month_today_action),
-                    exit = scaleOut(),
+                    onToday = jumpToToday,
-                ) {
+                    onCreate = {
-                    ExtendedFloatingActionButton(
+                        // Anchor on today when its month is shown, else the 1st.
-                        onClick = jumpToToday,
+                        val today = Clock.System.now()
-                        icon = { Icon(Icons.Default.Refresh, contentDescription = null) },
+                            .toLocalDateTime(TimeZone.currentSystemDefault()).date
-                        text = { Text(stringResource(R.string.month_today_action)) },
+                        onCreateEvent(
+                            if (isOnCurrentMonth) today
+                            else LocalDate(month.year, month.month, 1),
+                        )
+                    },
                 )
-                }
             },
         ) { innerPadding ->
             Column(
@@ -162,9 +174,10 @@ fun MonthScreen(
                     .padding(innerPadding)
                     .fillMaxSize(),
             ) {
-                WeekdayHeader(weekStart = DayOfWeek.MONDAY)
+                WeekdayHeader(weekStart = weekStart)
                 MonthContent(
                     state = state,
+                    weekStart = weekStart,
                     slideDir = slideDir,
                     onSwipeNext = goNext,
                     onSwipePrev = goPrev,
@@ -179,6 +192,7 @@ fun MonthScreen(
 @Composable
 private fun MonthContent(
     state: MonthUiState,
+    weekStart: DayOfWeek,
     slideDir: Int,
     onSwipeNext: () -> Unit,
     onSwipePrev: () -> Unit,
@@ -223,7 +237,7 @@ private fun MonthContent(
             is MonthUiState.Failure -> CalendarFailure(reason = s.reason, onRetry = onRetry)
             is MonthUiState.Success -> MonthGrid(
                 state = s,
-                weekStart = DayOfWeek.MONDAY,
+                weekStart = weekStart,
                 onOpenDay = onOpenDay,
             )
         }

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

@@ -5,6 +5,8 @@ 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.prefs.SettingsPrefs
+import de.jeanlucmakiola.calendula.data.prefs.resolveFirstDay
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventInstance
 import de.jeanlucmakiola.calendula.domain.FailureReason
@@ -17,6 +19,7 @@ import kotlinx.coroutines.flow.catch
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.datetime.DateTimeUnit
 import kotlinx.datetime.DayOfWeek
@@ -29,6 +32,7 @@ import kotlinx.datetime.minus
 import kotlinx.datetime.plus
 import kotlinx.datetime.toInstant
 import kotlinx.datetime.toLocalDateTime
+import java.util.Locale
 import kotlin.time.Clock
 import kotlin.time.Instant
 import javax.inject.Inject
@@ -37,13 +41,21 @@ import javax.inject.Inject
 @HiltViewModel
 class MonthViewModel @Inject constructor(
     private val repository: CalendarRepository,
+    settingsPrefs: SettingsPrefs,
     @IoDispatcher private val io: CoroutineDispatcher,
 ) : ViewModel() {
 
     private val zone = TimeZone.currentSystemDefault()
+    private val locale: Locale = Locale.getDefault()
 
-    // V1: week starts Monday. DataStore-driven preference comes with Settings.
+    /** First day of the week, from the Settings preference (AUTO → locale). */
-    private val weekStart: DayOfWeek = DayOfWeek.MONDAY
+    val weekStart: StateFlow<DayOfWeek> = settingsPrefs.weekStart
+        .map { it.resolveFirstDay(locale) }
+        .stateIn(
+            scope = viewModelScope,
+            started = SharingStarted.WhileSubscribed(5_000L),
+            initialValue = DayOfWeek.MONDAY,
+        )
 
     private val todayDate: LocalDate
         get() = Clock.System.now().toLocalDateTime(zone).date
@@ -51,9 +63,10 @@ class MonthViewModel @Inject constructor(
     private val _month = MutableStateFlow(YearMonth(todayDate.year, todayDate.month))
     val month: StateFlow<YearMonth> = _month
 
-    val state: StateFlow<MonthUiState> = _month
+    val state: StateFlow<MonthUiState> =
-        .flatMapLatest { ym ->
+        combine(_month, weekStart) { ym, ws -> ym to ws }
-            val range = monthGridRange(ym, weekStart, zone)
+            .flatMapLatest { (ym, ws) ->
+                val range = monthGridRange(ym, ws, zone)
                 combine(
                     repository.calendars(),
                     repository.instances(range),

app/src/main/java/de/jeanlucmakiola/calendula/ui/permission/PermissionScreen.kt

@@ -6,28 +6,70 @@ import android.net.Uri
 import android.provider.Settings
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
 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.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.navigationBarsPadding
+import androidx.compose.foundation.layout.offset
 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.ArrowForward
+import androidx.compose.material.icons.filled.CalendarMonth
+import androidx.compose.material.icons.filled.Lock
+import androidx.compose.material.icons.filled.VisibilityOff
 import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.OutlinedButton
+import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.colorResource
+import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import androidx.compose.foundation.Image
 import de.jeanlucmakiola.calendula.R
 
+private val CALENDAR_PERMISSIONS = arrayOf(
+    Manifest.permission.READ_CALENDAR,
+    Manifest.permission.WRITE_CALENDAR,
+)
+
+// MD3 8dp spacing scale, scoped to this screen.
+private object Space {
+    val xs = 8.dp
+    val sm = 16.dp
+    val md = 24.dp
+    val lg = 32.dp
+    val xl = 48.dp
+}
+
 @Composable
 fun PermissionScreen(
     onGranted: () -> Unit,
@@ -36,10 +78,17 @@ fun PermissionScreen(
 ) {
     val state by viewModel.state.collectAsStateWithLifecycle()
 
+    // READ and WRITE are requested together (one system dialog — same
+    // permission group), but only READ gates the app: declining write keeps
+    // Calendula usable read-only.
     val launcher = rememberLauncherForActivityResult(
-        contract = ActivityResultContracts.RequestPermission(),
+        contract = ActivityResultContracts.RequestMultiplePermissions(),
-    ) { granted ->
+    ) { results ->
-        if (granted) viewModel.onGranted() else viewModel.onDenied()
+        if (results[Manifest.permission.READ_CALENDAR] == true) {
+            viewModel.onGranted()
+        } else {
+            viewModel.onDenied()
+        }
     }
 
     LaunchedEffect(state) {
@@ -48,13 +97,13 @@ fun PermissionScreen(
 
     when (state) {
         is PermissionUiState.Rationale -> RationaleContent(
-            onRequest = { launcher.launch(Manifest.permission.READ_CALENDAR) },
+            onRequest = { launcher.launch(CALENDAR_PERMISSIONS) },
             modifier = modifier,
         )
         is PermissionUiState.Denied -> DeniedContent(
             onRetry = {
                 viewModel.onRetry()
-                launcher.launch(Manifest.permission.READ_CALENDAR)
+                launcher.launch(CALENDAR_PERMISSIONS)
             },
             modifier = modifier,
         )
@@ -69,24 +118,68 @@ private fun RationaleContent(
     onRequest: () -> Unit,
     modifier: Modifier = Modifier,
 ) {
-    Column(
+    PermissionScaffold(
-        modifier = modifier.fillMaxSize().padding(24.dp),
+        modifier = modifier,
-        verticalArrangement = Arrangement.Center,
+        hero = { BrandHero(denied = false) },
-        horizontalAlignment = Alignment.CenterHorizontally,
+        actions = {
+            Button(
+                onClick = onRequest,
+                modifier = Modifier.fillMaxWidth().height(56.dp),
+                contentPadding = ButtonDefaults.ButtonWithIconContentPadding,
             ) {
+                Text(
+                    text = stringResource(R.string.permission_request_button),
+                    style = MaterialTheme.typography.titleMedium,
+                )
+                Spacer(Modifier.width(Space.xs))
+                Icon(
+                    imageVector = Icons.AutoMirrored.Filled.ArrowForward,
+                    contentDescription = null,
+                    modifier = Modifier.size(20.dp),
+                )
+            }
+            PrivacyFootnote()
+        },
+    ) {
+        Text(
+            text = stringResource(R.string.app_name).uppercase(),
+            style = MaterialTheme.typography.labelLarge,
+            color = MaterialTheme.colorScheme.primary,
+            letterSpacing = 2.sp,
+        )
+        Spacer(Modifier.height(Space.xs))
         Text(
             text = stringResource(R.string.permission_rationale_title),
             style = MaterialTheme.typography.headlineMedium,
+            textAlign = TextAlign.Center,
         )
-        Spacer(Modifier.height(16.dp))
+        Spacer(Modifier.height(12.dp))
         Text(
             text = stringResource(R.string.permission_rationale_body),
             style = MaterialTheme.typography.bodyLarge,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+            textAlign = TextAlign.Center,
+        )
+
+        Spacer(Modifier.height(Space.xl))
+
+        BenefitRow(
+            icon = Icons.Filled.Lock,
+            title = stringResource(R.string.permission_benefit_private_title),
+            body = stringResource(R.string.permission_benefit_private_body),
+        )
+        Spacer(Modifier.height(Space.sm))
+        BenefitRow(
+            icon = Icons.Filled.CalendarMonth,
+            title = stringResource(R.string.permission_benefit_sync_title),
+            body = stringResource(R.string.permission_benefit_sync_body),
+        )
+        Spacer(Modifier.height(Space.sm))
+        BenefitRow(
+            icon = Icons.Filled.VisibilityOff,
+            title = stringResource(R.string.permission_benefit_privacy_title),
+            body = stringResource(R.string.permission_benefit_privacy_body),
         )
-        Spacer(Modifier.height(32.dp))
-        Button(onClick = onRequest) {
-            Text(stringResource(R.string.permission_request_button))
-        }
     }
 }
 
@@ -96,26 +189,11 @@ private fun DeniedContent(
     modifier: Modifier = Modifier,
 ) {
     val context = LocalContext.current
-    Column(
+    PermissionScaffold(
-        modifier = modifier.fillMaxSize().padding(24.dp),
+        modifier = modifier,
-        verticalArrangement = Arrangement.Center,
+        hero = { BrandHero(denied = true) },
-        horizontalAlignment = Alignment.CenterHorizontally,
+        actions = {
-    ) {
+            Button(
-        Text(
-            text = stringResource(R.string.permission_denied_title),
-            style = MaterialTheme.typography.headlineMedium,
-        )
-        Spacer(Modifier.height(16.dp))
-        Text(
-            text = stringResource(R.string.permission_denied_body),
-            style = MaterialTheme.typography.bodyLarge,
-        )
-        Spacer(Modifier.height(32.dp))
-        Button(onClick = onRetry) {
-            Text(stringResource(R.string.permission_retry_button))
-        }
-        Spacer(Modifier.height(12.dp))
-        OutlinedButton(
                 onClick = {
                     val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS).apply {
                         data = Uri.fromParts("package", context.packageName, null)
@@ -123,8 +201,170 @@ private fun DeniedContent(
                     }
                     context.startActivity(intent)
                 },
+                modifier = Modifier.fillMaxWidth().height(56.dp),
             ) {
-            Text(stringResource(R.string.permission_open_settings_button))
+                Text(
+                    text = stringResource(R.string.permission_open_settings_button),
+                    style = MaterialTheme.typography.titleMedium,
+                )
+            }
+            TextButton(
+                onClick = onRetry,
+                modifier = Modifier.fillMaxWidth(),
+            ) {
+                Text(stringResource(R.string.permission_retry_button))
+            }
+        },
+    ) {
+        Text(
+            text = stringResource(R.string.permission_denied_title),
+            style = MaterialTheme.typography.headlineMedium,
+            textAlign = TextAlign.Center,
+        )
+        Spacer(Modifier.height(12.dp))
+        Text(
+            text = stringResource(R.string.permission_denied_body),
+            style = MaterialTheme.typography.bodyLarge,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+            textAlign = TextAlign.Center,
+        )
+    }
+}
+
+/**
+ * Shared onboarding shell: a scrollable, centred hero + body with the call(s) to
+ * action pinned to the bottom (clear of the navigation bar). The content slot is
+ * centred horizontally; benefit rows fill the width so their own content
+ * left-aligns.
+ */
+@Composable
+private fun PermissionScaffold(
+    hero: @Composable () -> Unit,
+    actions: @Composable ColumnScope.() -> Unit,
+    modifier: Modifier = Modifier,
+    body: @Composable ColumnScope.() -> Unit,
+) {
+    Scaffold(
+        modifier = modifier,
+        containerColor = MaterialTheme.colorScheme.surface,
+        bottomBar = {
+            Column(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .navigationBarsPadding()
+                    .padding(horizontal = Space.md, vertical = Space.sm),
+                horizontalAlignment = Alignment.CenterHorizontally,
+                verticalArrangement = Arrangement.spacedBy(4.dp),
+                content = actions,
+            )
+        },
+    ) { innerPadding ->
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(innerPadding)
+                .verticalScroll(rememberScrollState())
+                .padding(horizontal = Space.md),
+            horizontalAlignment = Alignment.CenterHorizontally,
+        ) {
+            Spacer(Modifier.height(Space.xl))
+            hero()
+            Spacer(Modifier.height(Space.lg))
+            body()
+            Spacer(Modifier.height(Space.md))
         }
     }
 }
+
+/** The app's adaptive launcher mark, reconstructed as a large branded squircle. */
+@Composable
+private fun BrandHero(denied: Boolean) {
+    Box(contentAlignment = Alignment.Center) {
+        Box(
+            modifier = Modifier
+                .size(128.dp)
+                .clip(RoundedCornerShape(34.dp))
+                .background(colorResource(R.color.ic_launcher_background)),
+        ) {
+            Image(
+                painter = painterResource(R.drawable.ic_launcher_foreground),
+                contentDescription = stringResource(R.string.app_name),
+                modifier = Modifier.fillMaxSize(),
+            )
+        }
+        if (denied) {
+            // A small lock badge sits over the corner to signal "blocked".
+            Box(
+                modifier = Modifier
+                    .align(Alignment.BottomEnd)
+                    .offset(x = 10.dp, y = 10.dp)
+                    .size(44.dp)
+                    .clip(CircleShape)
+                    .background(MaterialTheme.colorScheme.errorContainer),
+                contentAlignment = Alignment.Center,
+            ) {
+                Icon(
+                    imageVector = Icons.Filled.Lock,
+                    contentDescription = null,
+                    tint = MaterialTheme.colorScheme.onErrorContainer,
+                    modifier = Modifier.size(24.dp),
+                )
+            }
+        }
+    }
+}
+
+/** One trust point: a tonal icon chip on the left, title + supporting text right. */
+@Composable
+private fun BenefitRow(icon: ImageVector, title: String, body: String) {
+    Row(
+        modifier = Modifier.fillMaxWidth(),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        Box(
+            modifier = Modifier
+                .size(44.dp)
+                .clip(CircleShape)
+                .background(MaterialTheme.colorScheme.secondaryContainer),
+            contentAlignment = Alignment.Center,
+        ) {
+            Icon(
+                imageVector = icon,
+                contentDescription = null,
+                tint = MaterialTheme.colorScheme.onSecondaryContainer,
+                modifier = Modifier.size(22.dp),
+            )
+        }
+        Spacer(Modifier.width(Space.sm))
+        Column(modifier = Modifier.weight(1f)) {
+            Text(text = title, style = MaterialTheme.typography.titleMedium)
+            Text(
+                text = body,
+                style = MaterialTheme.typography.bodyMedium,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+            )
+        }
+    }
+}
+
+@Composable
+private fun PrivacyFootnote() {
+    Row(
+        modifier = Modifier.fillMaxWidth().padding(top = 4.dp),
+        horizontalArrangement = Arrangement.Center,
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        Icon(
+            imageVector = Icons.Filled.Lock,
+            contentDescription = null,
+            tint = MaterialTheme.colorScheme.onSurfaceVariant,
+            modifier = Modifier.size(14.dp),
+        )
+        Spacer(Modifier.width(6.dp))
+        Text(
+            text = stringResource(R.string.permission_privacy_footnote),
+            style = MaterialTheme.typography.labelMedium,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+        )
+    }
+}

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

@@ -0,0 +1,36 @@
+package de.jeanlucmakiola.calendula.ui.settings
+
+import androidx.appcompat.app.AppCompatDelegate
+import androidx.core.os.LocaleListCompat
+
+/** UI-facing language choice. AUTO follows the system languages. */
+enum class LanguagePref { AUTO, GERMAN, ENGLISH }
+
+/**
+ * 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.
+ */
+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
+        }
+    }
+
+    fun apply(pref: LanguagePref) {
+        val locales = when (pref) {
+            LanguagePref.AUTO -> LocaleListCompat.getEmptyLocaleList()
+            LanguagePref.GERMAN -> LocaleListCompat.forLanguageTags("de")
+            LanguagePref.ENGLISH -> LocaleListCompat.forLanguageTags("en")
+        }
+        AppCompatDelegate.setApplicationLocales(locales)
+    }
+}

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

@@ -0,0 +1,372 @@
+package de.jeanlucmakiola.calendula.ui.settings
+
+import android.content.Intent
+import androidx.activity.compose.BackHandler
+import androidx.core.net.toUri
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+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.width
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.filled.ArrowDropDown
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Switch
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.material3.TopAppBar
+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.platform.LocalContext
+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.data.prefs.ThemeMode
+import de.jeanlucmakiola.calendula.data.prefs.WeekStartPref
+import de.jeanlucmakiola.calendula.domain.EventFormField
+
+/**
+ * Settings (M4) — appearance (theme, dynamic colour, week start), language,
+ * and an about section. A full-screen destination; [onBack] pops it.
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun SettingsScreen(
+    onBack: () -> Unit,
+    modifier: Modifier = Modifier,
+    viewModel: SettingsViewModel = hiltViewModel(),
+) {
+    val state by viewModel.state.collectAsStateWithLifecycle()
+
+    // Intercept the system back button/gesture — without this it falls through
+    // to the activity and closes the app instead of returning to the calendar.
+    BackHandler { onBack() }
+
+    Scaffold(
+        modifier = modifier
+            .fillMaxSize()
+            .background(MaterialTheme.colorScheme.surface),
+        topBar = {
+            TopAppBar(
+                title = { Text(stringResource(R.string.settings_title)) },
+                navigationIcon = {
+                    IconButton(onClick = onBack) {
+                        Icon(
+                            Icons.AutoMirrored.Filled.ArrowBack,
+                            contentDescription = stringResource(R.string.settings_back),
+                        )
+                    }
+                },
+            )
+        },
+    ) { innerPadding ->
+        Column(
+            modifier = Modifier
+                .padding(innerPadding)
+                .fillMaxSize()
+                .verticalScroll(rememberScrollState()),
+        ) {
+            SectionHeader(stringResource(R.string.settings_section_appearance))
+
+            SettingDropdownRow(
+                title = stringResource(R.string.settings_theme),
+                selected = state.themeMode,
+                options = ThemeMode.entries,
+                optionLabel = { themeLabel(it) },
+                onSelect = viewModel::setThemeMode,
+            )
+            DynamicColorRow(
+                checked = state.dynamicColor,
+                enabled = state.dynamicColorAvailable,
+                onCheckedChange = viewModel::setDynamicColor,
+            )
+            SettingDropdownRow(
+                title = stringResource(R.string.settings_week_start),
+                selected = state.weekStart,
+                options = WeekStartPref.entries,
+                optionLabel = { weekStartLabel(it) },
+                onSelect = viewModel::setWeekStart,
+            )
+
+            HorizontalDivider(Modifier.padding(vertical = 8.dp))
+            SectionHeader(stringResource(R.string.settings_section_event_form))
+            Text(
+                text = stringResource(R.string.settings_form_fields_hint),
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.padding(horizontal = 24.dp),
+            )
+            EventFormField.entries.forEach { field ->
+                FormFieldRow(
+                    title = stringResource(formFieldLabel(field)),
+                    checked = field in state.defaultFormFields,
+                    onCheckedChange = { viewModel.setFormFieldDefault(field, it) },
+                )
+            }
+
+            HorizontalDivider(Modifier.padding(vertical = 8.dp))
+            SectionHeader(stringResource(R.string.settings_section_language))
+            LanguageRow()
+
+            HorizontalDivider(Modifier.padding(vertical = 8.dp))
+            SectionHeader(stringResource(R.string.settings_section_about))
+            AboutSection()
+            Spacer(Modifier.height(24.dp))
+        }
+    }
+}
+
+@Composable
+private fun LanguageRow() {
+    // Setting a locale recreates the activity; mirror the choice locally so the
+    // dropdown updates instantly even before the recreation lands.
+    var current by remember { mutableStateOf(AppLanguage.current()) }
+    SettingDropdownRow(
+        title = stringResource(R.string.settings_language),
+        selected = current,
+        options = LanguagePref.entries,
+        optionLabel = { languageLabel(it) },
+        onSelect = {
+            current = it
+            AppLanguage.apply(it)
+        },
+    )
+}
+
+@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 <T> SettingDropdownRow(
+    title: String,
+    selected: T,
+    options: List<T>,
+    optionLabel: @Composable (T) -> String,
+    onSelect: (T) -> Unit,
+) {
+    var expanded by remember { mutableStateOf(false) }
+    Box {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .clickable { expanded = true }
+                .padding(horizontal = 24.dp, vertical = 16.dp),
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            Text(
+                text = title,
+                style = MaterialTheme.typography.bodyLarge,
+                modifier = Modifier.weight(1f),
+            )
+            Text(
+                text = optionLabel(selected),
+                style = MaterialTheme.typography.bodyMedium,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+            )
+            Icon(
+                Icons.Default.ArrowDropDown,
+                contentDescription = null,
+                tint = MaterialTheme.colorScheme.onSurfaceVariant,
+            )
+        }
+        DropdownMenu(expanded = expanded, onDismissRequest = { expanded = false }) {
+            options.forEach { option ->
+                DropdownMenuItem(
+                    text = { Text(optionLabel(option)) },
+                    onClick = {
+                        expanded = false
+                        onSelect(option)
+                    },
+                )
+            }
+        }
+    }
+}
+
+@Composable
+private fun DynamicColorRow(
+    checked: Boolean,
+    enabled: Boolean,
+    onCheckedChange: (Boolean) -> Unit,
+) {
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(horizontal = 24.dp, vertical = 12.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        Column(Modifier.weight(1f)) {
+            Text(
+                text = stringResource(R.string.settings_dynamic_color),
+                style = MaterialTheme.typography.bodyLarge,
+                color = if (enabled) MaterialTheme.colorScheme.onSurface
+                else MaterialTheme.colorScheme.onSurfaceVariant,
+            )
+            if (!enabled) {
+                Text(
+                    text = stringResource(R.string.settings_dynamic_color_unavailable),
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
+        }
+        Switch(
+            checked = checked,
+            onCheckedChange = onCheckedChange,
+            enabled = enabled,
+        )
+    }
+}
+
+@Composable
+private fun AboutSection() {
+    val context = LocalContext.current
+    val versionName = remember {
+        runCatching {
+            context.packageManager.getPackageInfo(context.packageName, 0).versionName
+        }.getOrNull() ?: "—"
+    }
+    val sourceUrl = stringResource(R.string.about_source_url)
+
+    AboutRow(
+        title = stringResource(R.string.settings_version),
+        value = versionName,
+    )
+    AboutRow(
+        title = stringResource(R.string.settings_license),
+        value = stringResource(R.string.settings_license_value),
+    )
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(horizontal = 16.dp, vertical = 4.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        Column(Modifier.weight(1f).padding(start = 8.dp)) {
+            Text(
+                text = stringResource(R.string.settings_source),
+                style = MaterialTheme.typography.bodyLarge,
+            )
+            Text(
+                text = sourceUrl.removePrefix("https://"),
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+            )
+        }
+        TextButton(onClick = {
+            val intent = Intent(Intent.ACTION_VIEW, sourceUrl.toUri())
+            runCatching { context.startActivity(intent) }
+        }) {
+            Text(stringResource(R.string.settings_source_open))
+        }
+    }
+}
+
+@Composable
+private fun AboutRow(title: String, value: String) {
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(horizontal = 24.dp, vertical = 12.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        Text(
+            text = title,
+            style = MaterialTheme.typography.bodyLarge,
+            modifier = Modifier.weight(1f),
+        )
+        Text(
+            text = value,
+            style = MaterialTheme.typography.bodyMedium,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+        )
+        Spacer(Modifier.width(8.dp))
+    }
+}
+
+@Composable
+private fun FormFieldRow(
+    title: String,
+    checked: Boolean,
+    onCheckedChange: (Boolean) -> Unit,
+) {
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(horizontal = 24.dp, vertical = 8.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        Text(
+            text = title,
+            style = MaterialTheme.typography.bodyLarge,
+            modifier = Modifier.weight(1f),
+        )
+        Switch(checked = checked, onCheckedChange = onCheckedChange)
+    }
+}
+
+private fun formFieldLabel(field: EventFormField): Int = when (field) {
+    EventFormField.Location -> R.string.event_detail_location
+    EventFormField.Description -> R.string.event_detail_description
+    EventFormField.Reminders -> R.string.event_detail_reminders
+    EventFormField.Availability -> R.string.event_edit_availability
+    EventFormField.Visibility -> R.string.event_edit_visibility
+}
+
+@Composable
+private fun themeLabel(mode: ThemeMode): String = stringResource(
+    when (mode) {
+        ThemeMode.SYSTEM -> R.string.settings_theme_system
+        ThemeMode.LIGHT -> R.string.settings_theme_light
+        ThemeMode.DARK -> R.string.settings_theme_dark
+    },
+)
+
+@Composable
+private fun weekStartLabel(pref: WeekStartPref): String = stringResource(
+    when (pref) {
+        WeekStartPref.AUTO -> R.string.settings_week_start_auto
+        WeekStartPref.MONDAY -> R.string.settings_week_start_monday
+        WeekStartPref.SUNDAY -> R.string.settings_week_start_sunday
+    },
+)
+
+@Composable
+private fun languageLabel(pref: LanguagePref): String = stringResource(
+    when (pref) {
+        LanguagePref.AUTO -> R.string.settings_language_auto
+        LanguagePref.GERMAN -> R.string.settings_language_german
+        LanguagePref.ENGLISH -> R.string.settings_language_english
+    },
+)

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

@@ -0,0 +1,21 @@
+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.EventFormField
+
+/**
+ * Settings screen state (M4). Persisted preferences are instant to read, so
+ * there is no Loading/Failure here — only a populated Success snapshot.
+ * [dynamicColorAvailable] is false below Android 12, where the toggle is shown
+ * disabled.
+ */
+data class SettingsUiState(
+    val themeMode: ThemeMode = ThemeMode.SYSTEM,
+    val dynamicColor: Boolean = true,
+    val dynamicColorAvailable: Boolean = true,
+    val weekStart: WeekStartPref = WeekStartPref.AUTO,
+    /** Optional event-form fields shown by default (rest behind "more fields"). */
+    val defaultFormFields: Set<EventFormField> = SettingsPrefs.DEFAULT_FORM_FIELDS,
+)

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

@@ -0,0 +1,60 @@
+package de.jeanlucmakiola.calendula.ui.settings
+
+import android.os.Build
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import dagger.hilt.android.lifecycle.HiltViewModel
+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.EventFormField
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
+import javax.inject.Inject
+
+@HiltViewModel
+class SettingsViewModel @Inject constructor(
+    private val prefs: SettingsPrefs,
+) : ViewModel() {
+
+    private val dynamicColorAvailable = Build.VERSION.SDK_INT >= Build.VERSION_CODES.S
+
+    val state: StateFlow<SettingsUiState> =
+        combine(
+            prefs.themeMode,
+            prefs.dynamicColor,
+            prefs.weekStart,
+            prefs.defaultFormFields,
+        ) { theme, dynamic, weekStart, formFields ->
+            SettingsUiState(
+                themeMode = theme,
+                dynamicColor = dynamic && dynamicColorAvailable,
+                dynamicColorAvailable = dynamicColorAvailable,
+                weekStart = weekStart,
+                defaultFormFields = formFields,
+            )
+        }.stateIn(
+            scope = viewModelScope,
+            started = SharingStarted.WhileSubscribed(5_000L),
+            initialValue = SettingsUiState(dynamicColorAvailable = dynamicColorAvailable),
+        )
+
+    fun setThemeMode(mode: ThemeMode) {
+        viewModelScope.launch { prefs.setThemeMode(mode) }
+    }
+
+    fun setDynamicColor(enabled: Boolean) {
+        viewModelScope.launch { prefs.setDynamicColor(enabled) }
+    }
+
+    fun setWeekStart(pref: WeekStartPref) {
+        viewModelScope.launch { prefs.setWeekStart(pref) }
+    }
+
+    fun setFormFieldDefault(field: EventFormField, enabled: Boolean) {
+        viewModelScope.launch { prefs.setFormFieldDefault(field, enabled) }
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/theme/Theme.kt

@@ -2,7 +2,9 @@ package de.jeanlucmakiola.calendula.ui.theme
 
 import android.os.Build
 import androidx.compose.foundation.isSystemInDarkTheme
-import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.ExperimentalMaterial3ExpressiveApi
+import androidx.compose.material3.MaterialExpressiveTheme
+import androidx.compose.material3.MotionScheme
 import androidx.compose.material3.dynamicDarkColorScheme
 import androidx.compose.material3.dynamicLightColorScheme
 import androidx.compose.runtime.Composable
@@ -17,6 +19,7 @@ import androidx.compose.ui.platform.LocalContext
  * The Settings screen (later) can override useDynamicColor and themePreference,
  * but the V1 foundation just follows the system.
  */
+@OptIn(ExperimentalMaterial3ExpressiveApi::class)
 @Composable
 fun CalendulaTheme(
     darkTheme: Boolean = isSystemInDarkTheme(),
@@ -32,9 +35,15 @@ fun CalendulaTheme(
         else -> CalendulaLightFallback
     }
 
-    MaterialTheme(
+    // MaterialExpressiveTheme routes all component + custom motion through
+    // MaterialTheme.motionScheme (switches, chips, pickers, calendar slide,
+    // FAB, field reveal). The STANDARD scheme is a deliberate choice over
+    // expressive(): same spring choreography, but without the overshoot —
+    // the bouncy variant felt overdone in review (2026-06-11).
+    MaterialExpressiveTheme(
         colorScheme = colorScheme,
         typography = CalendulaTypography,
+        motionScheme = MotionScheme.standard(),
         content = content,
     )
 }

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

@@ -1,11 +1,8 @@
 package de.jeanlucmakiola.calendula.ui.week
 
 import androidx.compose.animation.AnimatedContent
-import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.animateColorAsState
 import androidx.compose.animation.core.animateDpAsState
-import androidx.compose.animation.scaleIn
-import androidx.compose.animation.scaleOut
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.gestures.detectHorizontalDragGestures
@@ -31,12 +28,10 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Menu
-import androidx.compose.material.icons.filled.Refresh
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
 import androidx.compose.material3.DrawerValue
 import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.ExtendedFloatingActionButton
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
@@ -77,6 +72,7 @@ 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.ViewSwitcherPill
@@ -87,9 +83,11 @@ import de.jeanlucmakiola.calendula.ui.common.next
 import de.jeanlucmakiola.calendula.ui.common.pastelize
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
-import kotlinx.datetime.DayOfWeek
 import kotlinx.datetime.LocalDate
+import kotlinx.datetime.TimeZone
 import kotlinx.datetime.plus
+import kotlinx.datetime.toLocalDateTime
+import kotlin.time.Clock
 import java.time.format.TextStyle as JavaTextStyle
 import java.util.Locale
 import kotlin.math.roundToInt
@@ -113,6 +111,8 @@ fun WeekScreen(
     selectedView: CalendarView,
     onSelectView: (CalendarView) -> Unit,
     onEventClick: (EventInstance) -> Unit,
+    onOpenSettings: () -> Unit,
+    onCreateEvent: (LocalDate) -> Unit,
     modifier: Modifier = Modifier,
     viewModel: WeekViewModel = hiltViewModel(),
 ) {
@@ -135,7 +135,10 @@ fun WeekScreen(
     )
 
     val isOnCurrentWeek = when (val s = state) {
-        is WeekUiState.Success -> s.weekStart == s.today.startOfWeek(DayOfWeek.MONDAY)
+        // True when today falls inside the displayed week — independent of which
+        // weekday the user picked as the first day.
+        is WeekUiState.Success ->
+            s.today >= s.weekStart && s.today <= s.weekStart.plus(6, kotlinx.datetime.DateTimeUnit.DAY)
         else -> true
     }
 
@@ -143,7 +146,15 @@ fun WeekScreen(
     var slideDir by remember { mutableIntStateOf(0) }
     val goNext = { slideDir = 1; viewModel.goToNext() }
     val goPrev = { slideDir = -1; viewModel.goToPrev() }
-    val jumpToToday = { slideDir = 0; viewModel.goToToday() }
+    // Slide toward today: viewing the future → today comes in from the left
+    // (back), viewing the past → from the right (forward).
+    val jumpToToday = {
+        slideDir = when (val s = state) {
+            is WeekUiState.Success -> if (s.today < s.weekStart) -1 else 1
+            else -> 0
+        }
+        viewModel.goToToday()
+    }
 
     ModalNavigationDrawer(
         drawerState = drawerState,
@@ -152,9 +163,10 @@ fun WeekScreen(
         drawerContent = {
             CalendarDrawer(
                 onToday = { jumpToToday(); scope.launch { drawerState.close() } },
-                onJumpToDate = { scope.launch { drawerState.close() } /* TODO: date picker */ },
+                onSettings = {
-                onFilter = { scope.launch { drawerState.close() } /* TODO: filter sheet */ },
+                    onOpenSettings()
-                onSettings = { scope.launch { drawerState.close() } /* TODO: settings */ },
+                    scope.launch { drawerState.close() }
+                },
             )
         },
     ) {
@@ -170,17 +182,17 @@ fun WeekScreen(
                 )
             },
             floatingActionButton = {
-                AnimatedVisibility(
+                CalendarFabColumn(
-                    visible = !isOnCurrentWeek,
+                    todayVisible = !isOnCurrentWeek,
-                    enter = scaleIn(),
+                    todayText = stringResource(R.string.week_today_action),
-                    exit = scaleOut(),
+                    onToday = jumpToToday,
-                ) {
+                    onCreate = {
-                    ExtendedFloatingActionButton(
+                        // Anchor on today when it's in view, else the week's first day.
-                        onClick = jumpToToday,
+                        val today = Clock.System.now()
-                        icon = { Icon(Icons.Default.Refresh, contentDescription = null) },
+                            .toLocalDateTime(TimeZone.currentSystemDefault()).date
-                        text = { Text(stringResource(R.string.week_today_action)) },
+                        onCreateEvent(if (isOnCurrentWeek) today else weekStart)
+                    },
                 )
-                }
             },
         ) { innerPadding ->
             WeekContent(

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

@@ -5,6 +5,8 @@ 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.prefs.SettingsPrefs
+import de.jeanlucmakiola.calendula.data.prefs.resolveFirstDay
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventInstance
 import de.jeanlucmakiola.calendula.domain.FailureReason
@@ -15,8 +17,10 @@ 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.flatMapLatest
 import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.datetime.DateTimeUnit
 import kotlinx.datetime.DayOfWeek
@@ -28,6 +32,7 @@ import kotlinx.datetime.minus
 import kotlinx.datetime.plus
 import kotlinx.datetime.toInstant
 import kotlinx.datetime.toLocalDateTime
+import java.util.Locale
 import kotlin.time.Clock
 import kotlin.time.Instant
 import javax.inject.Inject
@@ -38,21 +43,41 @@ const val MINUTES_PER_DAY: Int = 24 * 60
 @HiltViewModel
 class WeekViewModel @Inject constructor(
     private val repository: CalendarRepository,
+    settingsPrefs: SettingsPrefs,
     @IoDispatcher private val io: CoroutineDispatcher,
 ) : ViewModel() {
 
     private val zone = TimeZone.currentSystemDefault()
-
+    private val locale: Locale = Locale.getDefault()
-    // V1: week starts Monday. DataStore-driven preference comes with Settings.
-    private val weekStart: DayOfWeek = DayOfWeek.MONDAY
 
     private val todayDate: LocalDate
         get() = Clock.System.now().toLocalDateTime(zone).date
 
-    private val _weekStartDate = MutableStateFlow(todayDate.startOfWeek(weekStart))
+    /** First day of the week, from the Settings preference (AUTO → locale). */
-    val weekStartDate: StateFlow<LocalDate> = _weekStartDate
+    private val weekStart: StateFlow<DayOfWeek> = settingsPrefs.weekStart
+        .map { it.resolveFirstDay(locale) }
+        .stateIn(
+            scope = viewModelScope,
+            started = SharingStarted.WhileSubscribed(5_000L),
+            initialValue = DayOfWeek.MONDAY,
+        )
 
-    val state: StateFlow<WeekUiState> = _weekStartDate
+    // Anchor is a representative day inside the visible week; the actual week
+    // start is derived against [weekStart], so changing the first-day preference
+    // re-frames the same week instead of jumping.
+    private val _anchor = MutableStateFlow(todayDate)
+
+    val weekStartDate: StateFlow<LocalDate> =
+        combine(_anchor, weekStart) { anchor, ws -> anchor.startOfWeek(ws) }
+            .stateIn(
+                scope = viewModelScope,
+                started = SharingStarted.WhileSubscribed(5_000L),
+                initialValue = todayDate.startOfWeek(DayOfWeek.MONDAY),
+            )
+
+    val state: StateFlow<WeekUiState> =
+        combine(_anchor, weekStart) { anchor, ws -> anchor.startOfWeek(ws) }
+            .distinctUntilChanged()
             .flatMapLatest { start ->
                 val range = weekRange(start, zone)
                 combine(
@@ -71,15 +96,15 @@ class WeekViewModel @Inject constructor(
             )
 
     fun goToPrev() {
-        _weekStartDate.value = _weekStartDate.value.minus(7, DateTimeUnit.DAY)
+        _anchor.value = _anchor.value.minus(7, DateTimeUnit.DAY)
     }
 
     fun goToNext() {
-        _weekStartDate.value = _weekStartDate.value.plus(7, DateTimeUnit.DAY)
+        _anchor.value = _anchor.value.plus(7, DateTimeUnit.DAY)
     }
 
     fun goToToday() {
-        _weekStartDate.value = todayDate.startOfWeek(weekStart)
+        _anchor.value = todayDate
     }
 
     private fun buildState(

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

@@ -12,13 +12,20 @@
     <string name="state_failure_provider">Kalender konnte nicht gelesen werden.</string>
 
     <!-- Permission-Flow (F1) -->
-    <string name="permission_rationale_title">Kalender-Zugriff</string>
+    <string name="permission_rationale_title">Alle Termine, schön im Blick</string>
-    <string name="permission_rationale_body">Calendula liest nur deinen Gerätekalender — keine Daten verlassen das Gerät.</string>
+    <string name="permission_rationale_body">Calendula braucht Zugriff auf deinen Kalender, um deine Termine zu zeigen und zu verwalten. Mehr verlangt die App nie.</string>
-    <string name="permission_request_button">Weiter</string>
+    <string name="permission_request_button">Kalender-Zugriff erlauben</string>
     <string name="permission_denied_title">Kalender-Zugriff abgelehnt</string>
     <string name="permission_denied_body">Ohne Kalender-Zugriff kann Calendula keine Termine anzeigen. Du kannst den Zugriff in den System-Einstellungen wieder erlauben.</string>
     <string name="permission_open_settings_button">System-Einstellungen öffnen</string>
     <string name="permission_retry_button">Erneut versuchen</string>
+    <string name="permission_benefit_private_title">Bleibt auf deinem Gerät</string>
+    <string name="permission_benefit_private_body">Deine Kalender werden lokal gelesen und verlassen das Telefon nie.</string>
+    <string name="permission_benefit_sync_title">Alle Kalender vereint</string>
+    <string name="permission_benefit_sync_body">Google, CalDAV, lokal — alles, was synchronisiert ist, erscheint automatisch.</string>
+    <string name="permission_benefit_privacy_title">Kein Tracking, niemals</string>
+    <string name="permission_benefit_privacy_body">Keine Telemetrie, keine Analyse, keine Werbung.</string>
+    <string name="permission_privacy_footnote">Bleibt auf deinem Gerät · keine Internet-Berechtigung</string>
 
     <!-- Monatsansicht (S1) -->
     <string name="month_prev">Vorheriger Monat</string>
@@ -26,8 +33,6 @@
     <string name="month_today_action">Heute</string>
     <string name="month_more_actions">Weitere Aktionen</string>
     <string name="month_open_menu">Menü öffnen</string>
-    <string name="month_action_filter">Kalender</string>
-    <string name="month_action_jump_to_date">Zu Datum springen…</string>
     <string name="month_action_settings">Einstellungen</string>
     <string name="month_a11y_today_prefix">Heute</string>
 
@@ -40,8 +45,42 @@
 
     <!-- Event-Detail-Screen (S4) -->
     <string name="event_detail_back">Zurück</string>
-    <string name="event_detail_edit">Bearbeiten</string>
     <string name="event_detail_delete">Löschen</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>
+    <string name="event_delete_option_occurrence">Nur dieser Termin</string>
+    <string name="event_delete_option_series">Alle Termine der Serie</string>
+    <string name="event_delete_failed">Termin konnte nicht gelöscht werden</string>
+    <string name="event_delete_write_denied">Calendula braucht Schreibzugriff, um Termine zu löschen</string>
+    <string name="dialog_cancel">Abbrechen</string>
+    <string name="dialog_ok">OK</string>
+
+    <!-- Termin-Formular (v1.2 Erstellen) -->
+    <string name="event_edit_new_title">Neuer Termin</string>
+    <string name="event_edit_close">Schließen</string>
+    <string name="event_edit_save">Speichern</string>
+    <string name="event_edit_title_hint">Titel hinzufügen</string>
+    <string name="event_edit_starts">Beginn</string>
+    <string name="event_edit_ends">Ende</string>
+    <string name="event_edit_error_end_before_start">Endet vor dem Beginn</string>
+    <string name="event_edit_error_no_calendar">Kein beschreibbarer Kalender verfügbar</string>
+    <string name="event_edit_save_failed">Termin konnte nicht gespeichert werden</string>
+    <string name="event_edit_write_denied">Calendula braucht Schreibzugriff, um Termine zu erstellen</string>
+    <string name="event_edit_more_fields">Weitere Felder</string>
+    <string name="event_edit_add">Hinzufügen</string>
+    <string name="event_edit_add_reminder">Erinnerung hinzufügen</string>
+    <string name="event_edit_remove_reminder">Erinnerung entfernen</string>
+    <string name="event_edit_reminder_custom">Benutzerdefiniert</string>
+    <string name="reminder_unit_minutes">Minuten</string>
+    <string name="reminder_unit_hours">Stunden</string>
+    <string name="reminder_unit_days">Tage</string>
+    <string name="reminder_unit_weeks">Wochen</string>
+    <string name="event_edit_availability">Verfügbarkeit</string>
+    <string name="event_edit_visibility">Sichtbarkeit</string>
+    <string name="event_availability_busy">Beschäftigt</string>
+    <string name="event_access_default">Standard</string>
+    <string name="event_access_public">Öffentlich</string>
     <string name="event_detail_all_day">Ganztägig</string>
     <string name="event_detail_calendar">Kalender</string>
     <string name="event_detail_calendar_unknown">Unbekannter Kalender</string>
@@ -68,6 +107,37 @@
     <string name="event_attendee_needs_action">Keine Antwort</string>
     <string name="event_attendee_unknown">—</string>
 
+    <!-- Event-Detail — vollständiges Auslesen (v0.6) -->
+    <string name="event_detail_reminders">Erinnerungen</string>
+    <string name="event_detail_timezone">Zeitzone</string>
+    <string name="event_status_tentative">Vorläufig</string>
+    <string name="event_status_cancelled">Abgesagt</string>
+    <string name="event_availability_free">Frei</string>
+    <string name="event_access_private">Privat</string>
+    <string name="event_access_confidential">Vertraulich</string>
+    <string name="event_attendee_organizer">Organisator</string>
+    <string name="event_attendee_optional">Optional</string>
+    <string name="event_attendee_resource">Ressource</string>
+    <string name="event_detail_self_response">Deine Antwort: %1$s</string>
+    <string name="reminder_at_time">Zur Startzeit</string>
+    <string name="reminder_default">Standarderinnerung</string>
+    <plurals name="reminder_minutes">
+        <item quantity="one">%d Minute vorher</item>
+        <item quantity="other">%d Minuten vorher</item>
+    </plurals>
+    <plurals name="reminder_hours">
+        <item quantity="one">%d Stunde vorher</item>
+        <item quantity="other">%d Stunden vorher</item>
+    </plurals>
+    <plurals name="reminder_days">
+        <item quantity="one">%d Tag vorher</item>
+        <item quantity="other">%d Tage vorher</item>
+    </plurals>
+    <plurals name="reminder_weeks">
+        <item quantity="one">%d Woche vorher</item>
+        <item quantity="other">%d Wochen vorher</item>
+    </plurals>
+
     <!-- Geteilte Event-Strings -->
     <string name="event_untitled">(Ohne Titel)</string>
 
@@ -75,4 +145,35 @@
     <string name="view_month">Monat</string>
     <string name="view_week">Woche</string>
     <string name="view_day">Tag</string>
+
+    <!-- Kalender-Filter (M3) -->
+    <string name="filter_title">Kalender</string>
+
+    <!-- Einstellungen (M4) -->
+    <string name="settings_title">Einstellungen</string>
+    <string name="settings_back">Zurück</string>
+    <string name="settings_section_appearance">Darstellung</string>
+    <string name="settings_theme">Design</string>
+    <string name="settings_theme_system">System</string>
+    <string name="settings_theme_light">Hell</string>
+    <string name="settings_theme_dark">Dunkel</string>
+    <string name="settings_dynamic_color">Dynamische Farben</string>
+    <string name="settings_dynamic_color_unavailable">Erfordert Android 12 oder neuer</string>
+    <string name="settings_week_start">Wochenstart</string>
+    <string name="settings_week_start_auto">Automatisch</string>
+    <string name="settings_week_start_monday">Montag</string>
+    <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_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>
+    <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>
 </resources>

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

@@ -13,13 +13,20 @@
     <string name="state_failure_provider">Could not read the calendar.</string>
 
     <!-- Permission flow (F1) -->
-    <string name="permission_rationale_title">Calendar access</string>
+    <string name="permission_rationale_title">See all your events, beautifully</string>
-    <string name="permission_rationale_body">Calendula reads only your device calendar — no data leaves your device.</string>
+    <string name="permission_rationale_body">Calendula needs access to your calendar to show and manage your events. That\'s the only thing it ever asks for.</string>
-    <string name="permission_request_button">Continue</string>
+    <string name="permission_request_button">Grant calendar access</string>
     <string name="permission_denied_title">Calendar access denied</string>
     <string name="permission_denied_body">Calendula cannot show events without calendar access. You can grant it again in the system settings.</string>
     <string name="permission_open_settings_button">Open system settings</string>
     <string name="permission_retry_button">Try again</string>
+    <string name="permission_benefit_private_title">Stays on your device</string>
+    <string name="permission_benefit_private_body">Your calendars are read locally and never leave the phone.</string>
+    <string name="permission_benefit_sync_title">All your calendars, together</string>
+    <string name="permission_benefit_sync_body">Google, CalDAV, local — anything synced to the device just appears.</string>
+    <string name="permission_benefit_privacy_title">No tracking, ever</string>
+    <string name="permission_benefit_privacy_body">Zero telemetry, zero analytics, no ads.</string>
+    <string name="permission_privacy_footnote">Stays on your device · no internet permission</string>
 
     <!-- Month view (S1) -->
     <string name="month_prev">Previous month</string>
@@ -27,8 +34,6 @@
     <string name="month_today_action">Today</string>
     <string name="month_more_actions">More actions</string>
     <string name="month_open_menu">Open menu</string>
-    <string name="month_action_filter">Calendars</string>
-    <string name="month_action_jump_to_date">Jump to date…</string>
     <string name="month_action_settings">Settings</string>
     <string name="month_a11y_today_prefix">Today</string>
 
@@ -41,8 +46,42 @@
 
     <!-- Event detail screen (S4) -->
     <string name="event_detail_back">Back</string>
-    <string name="event_detail_edit">Edit</string>
     <string name="event_detail_delete">Delete</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>
+    <string name="event_delete_option_occurrence">Only this event</string>
+    <string name="event_delete_option_series">All events in the series</string>
+    <string name="event_delete_failed">Couldn\'t delete the event</string>
+    <string name="event_delete_write_denied">Calendula needs write access to delete events</string>
+    <string name="dialog_cancel">Cancel</string>
+    <string name="dialog_ok">OK</string>
+
+    <!-- Event form (v1.2 create) -->
+    <string name="event_edit_new_title">New event</string>
+    <string name="event_edit_close">Close</string>
+    <string name="event_edit_save">Save</string>
+    <string name="event_edit_title_hint">Add title</string>
+    <string name="event_edit_starts">Starts</string>
+    <string name="event_edit_ends">Ends</string>
+    <string name="event_edit_error_end_before_start">Ends before it starts</string>
+    <string name="event_edit_error_no_calendar">No writable calendar available</string>
+    <string name="event_edit_save_failed">Couldn\'t save the event</string>
+    <string name="event_edit_write_denied">Calendula needs write access to create events</string>
+    <string name="event_edit_more_fields">More fields</string>
+    <string name="event_edit_add">Add</string>
+    <string name="event_edit_add_reminder">Add reminder</string>
+    <string name="event_edit_remove_reminder">Remove reminder</string>
+    <string name="event_edit_reminder_custom">Custom</string>
+    <string name="reminder_unit_minutes">minutes</string>
+    <string name="reminder_unit_hours">hours</string>
+    <string name="reminder_unit_days">days</string>
+    <string name="reminder_unit_weeks">weeks</string>
+    <string name="event_edit_availability">Availability</string>
+    <string name="event_edit_visibility">Visibility</string>
+    <string name="event_availability_busy">Busy</string>
+    <string name="event_access_default">Default</string>
+    <string name="event_access_public">Public</string>
     <string name="event_detail_all_day">All day</string>
     <string name="event_detail_calendar">Calendar</string>
     <string name="event_detail_calendar_unknown">Unknown calendar</string>
@@ -69,6 +108,37 @@
     <string name="event_attendee_needs_action">No response</string>
     <string name="event_attendee_unknown">—</string>
 
+    <!-- Event detail — full read (v0.6) -->
+    <string name="event_detail_reminders">Reminders</string>
+    <string name="event_detail_timezone">Time zone</string>
+    <string name="event_status_tentative">Tentative</string>
+    <string name="event_status_cancelled">Cancelled</string>
+    <string name="event_availability_free">Free</string>
+    <string name="event_access_private">Private</string>
+    <string name="event_access_confidential">Confidential</string>
+    <string name="event_attendee_organizer">Organizer</string>
+    <string name="event_attendee_optional">Optional</string>
+    <string name="event_attendee_resource">Resource</string>
+    <string name="event_detail_self_response">Your response: %1$s</string>
+    <string name="reminder_at_time">At time of event</string>
+    <string name="reminder_default">Default reminder</string>
+    <plurals name="reminder_minutes">
+        <item quantity="one">%d minute before</item>
+        <item quantity="other">%d minutes before</item>
+    </plurals>
+    <plurals name="reminder_hours">
+        <item quantity="one">%d hour before</item>
+        <item quantity="other">%d hours before</item>
+    </plurals>
+    <plurals name="reminder_days">
+        <item quantity="one">%d day before</item>
+        <item quantity="other">%d days before</item>
+    </plurals>
+    <plurals name="reminder_weeks">
+        <item quantity="one">%d week before</item>
+        <item quantity="other">%d weeks before</item>
+    </plurals>
+
     <!-- Shared event strings -->
     <string name="event_untitled">(No title)</string>
 
@@ -76,4 +146,36 @@
     <string name="view_month">Month</string>
     <string name="view_week">Week</string>
     <string name="view_day">Day</string>
+
+    <!-- Calendar filter (M3) -->
+    <string name="filter_title">Calendars</string>
+
+    <!-- Settings (M4) -->
+    <string name="settings_title">Settings</string>
+    <string name="settings_back">Back</string>
+    <string name="settings_section_appearance">Appearance</string>
+    <string name="settings_theme">Theme</string>
+    <string name="settings_theme_system">System</string>
+    <string name="settings_theme_light">Light</string>
+    <string name="settings_theme_dark">Dark</string>
+    <string name="settings_dynamic_color">Dynamic colour</string>
+    <string name="settings_dynamic_color_unavailable">Requires Android 12 or newer</string>
+    <string name="settings_week_start">Week starts on</string>
+    <string name="settings_week_start_auto">Automatic</string>
+    <string name="settings_week_start_monday">Monday</string>
+    <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_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>
+    <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="about_source_url" translatable="false">https://gitea.jeanlucmakiola.de/makiolaj/calendula</string>
 </resources>

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

@@ -1,5 +1,6 @@
 package de.jeanlucmakiola.calendula.data.calendar
 
+import android.provider.CalendarContract
 import com.google.common.truth.Truth.assertThat
 import org.junit.jupiter.api.Test
 
@@ -12,6 +13,7 @@ class CalendarMapperTest {
         accountType: String? = "LOCAL",
         color: Int = 0,
         visible: Int = 1,
+        accessLevel: Int = CalendarContract.Calendars.CAL_ACCESS_OWNER,
     ): MapColumnReader = MapColumnReader(
         CalendarProjection.IDX_ID to id,
         CalendarProjection.IDX_DISPLAY_NAME to displayName,
@@ -19,6 +21,7 @@ class CalendarMapperTest {
         CalendarProjection.IDX_ACCOUNT_TYPE to accountType,
         CalendarProjection.IDX_COLOR to color,
         CalendarProjection.IDX_VISIBLE to visible,
+        CalendarProjection.IDX_ACCESS_LEVEL to accessLevel,
     )
 
     @Test
@@ -39,6 +42,7 @@ class CalendarMapperTest {
                 accountType = "com.google",
                 color = 0xFF112233.toInt(),
                 isVisibleInSystem = true,
+                canModifyContents = true,
             )
         )
     }
@@ -65,4 +69,25 @@ class CalendarMapperTest {
         assertThat(src.accountName).isEqualTo("")
         assertThat(src.accountType).isEqualTo("")
     }
+
+    @Test
+    fun `contributor access and above can modify contents`() {
+        val contributor = reader(accessLevel = CalendarContract.Calendars.CAL_ACCESS_CONTRIBUTOR)
+        val owner = reader(accessLevel = CalendarContract.Calendars.CAL_ACCESS_OWNER)
+        assertThat(contributor.toCalendarSource().canModifyContents).isTrue()
+        assertThat(owner.toCalendarSource().canModifyContents).isTrue()
+    }
+
+    @Test
+    fun `read access cannot modify contents`() {
+        val src = reader(accessLevel = CalendarContract.Calendars.CAL_ACCESS_READ)
+        assertThat(src.toCalendarSource().canModifyContents).isFalse()
+    }
+
+    @Test
+    fun `missing access level defaults to read-only`() {
+        // WebCal subscriptions on some providers report level 0 (CAL_ACCESS_NONE).
+        val src = reader(accessLevel = CalendarContract.Calendars.CAL_ACCESS_NONE)
+        assertThat(src.toCalendarSource().canModifyContents).isFalse()
+    }
 }

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

@@ -1,24 +1,46 @@
 package de.jeanlucmakiola.calendula.data.calendar
 
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.PreferenceDataStoreFactory
+import androidx.datastore.preferences.core.Preferences
 import app.cash.turbine.test
 import com.google.common.truth.Truth.assertThat
+import de.jeanlucmakiola.calendula.data.prefs.CalendarPrefs
 import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
 import kotlinx.coroutines.Dispatchers
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.LocalDateTime
+import kotlinx.datetime.LocalTime
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.test.UnconfinedTestDispatcher
 import kotlinx.coroutines.test.runTest
 import kotlin.time.Instant
 import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.io.TempDir
+import java.nio.file.Path
 
 @OptIn(ExperimentalCoroutinesApi::class)
 class CalendarRepositoryImplTest {
 
+    private fun newPrefs(tempDir: Path): CalendarPrefs =
+        CalendarPrefs(newDataStore(tempDir))
+
+    private fun newDataStore(tempDir: Path): DataStore<Preferences> =
+        PreferenceDataStoreFactory.create(
+            produceFile = { tempDir.resolve("repo_test_prefs.preferences_pb").toFile() },
+        )
+
     private fun makeCal(id: Long, name: String = "Cal $id"): CalendarSource =
         CalendarSource(id, name, "x@y", "LOCAL", 0xFF112233.toInt(), true)
 
-    private fun makeEvent(id: Long, title: String = "E $id"): EventInstance = EventInstance(
+    private fun makeEvent(
-        instanceId = id, eventId = id, calendarId = 1L,
+        id: Long,
+        title: String = "E $id",
+        calendarId: Long = 1L,
+    ): EventInstance = EventInstance(
+        instanceId = id, eventId = id, calendarId = calendarId,
         title = title,
         start = Instant.fromEpochMilliseconds(1_000_000_000L),
         end = Instant.fromEpochMilliseconds(1_000_003_600L),
@@ -26,11 +48,11 @@ class CalendarRepositoryImplTest {
     )
 
     @Test
-    fun `calendars emits initial query result on subscribe`() = runTest {
+    fun `calendars emits initial query result on subscribe`(@TempDir tempDir: Path) = runTest {
         val fake = FakeCalendarDataSource().apply {
             calendarsResult = listOf(makeCal(1L), makeCal(2L))
         }
-        val repo = CalendarRepositoryImpl(fake, UnconfinedTestDispatcher(testScheduler))
+        val repo = CalendarRepositoryImpl(fake, newPrefs(tempDir), UnconfinedTestDispatcher(testScheduler))
 
         repo.calendars().test {
             val first = awaitItem()
@@ -40,11 +62,11 @@ class CalendarRepositoryImplTest {
     }
 
     @Test
-    fun `calendars re-emits after change listener tick`() = runTest {
+    fun `calendars re-emits after change listener tick`(@TempDir tempDir: Path) = runTest {
         val fake = FakeCalendarDataSource().apply {
             calendarsResult = listOf(makeCal(1L))
         }
-        val repo = CalendarRepositoryImpl(fake, UnconfinedTestDispatcher(testScheduler))
+        val repo = CalendarRepositoryImpl(fake, newPrefs(tempDir), UnconfinedTestDispatcher(testScheduler))
 
         repo.calendars().test {
             assertThat(awaitItem().map { it.id }).containsExactly(1L)
@@ -58,7 +80,7 @@ class CalendarRepositoryImplTest {
     }
 
     @Test
-    fun `instances forwards epoch-millis bounds to data source`() = runTest {
+    fun `instances forwards epoch-millis bounds to data source`(@TempDir tempDir: Path) = runTest {
         var observedBegin: Long? = null
         var observedEnd: Long? = null
         val fake = FakeCalendarDataSource().apply {
@@ -68,7 +90,7 @@ class CalendarRepositoryImplTest {
                 listOf(makeEvent(10L))
             }
         }
-        val repo = CalendarRepositoryImpl(fake, UnconfinedTestDispatcher(testScheduler))
+        val repo = CalendarRepositoryImpl(fake, newPrefs(tempDir), UnconfinedTestDispatcher(testScheduler))
 
         val range = Instant.fromEpochMilliseconds(1_000L)..Instant.fromEpochMilliseconds(2_000L)
         repo.instances(range).test {
@@ -80,11 +102,11 @@ class CalendarRepositoryImplTest {
     }
 
     @Test
-    fun `instances passes-through whatever the data source returns`() = runTest {
+    fun `instances passes-through whatever the data source returns`(@TempDir tempDir: Path) = runTest {
         val fake = FakeCalendarDataSource().apply {
             instancesResult = {_, _ -> listOf(makeEvent(10L, "Good")) }
         }
-        val repo = CalendarRepositoryImpl(fake, UnconfinedTestDispatcher(testScheduler))
+        val repo = CalendarRepositoryImpl(fake, newPrefs(tempDir), UnconfinedTestDispatcher(testScheduler))
 
         val range = Instant.fromEpochMilliseconds(0)..Instant.fromEpochMilliseconds(10_000L)
         repo.instances(range).test {
@@ -95,11 +117,130 @@ class CalendarRepositoryImplTest {
     }
 
     @Test
-    fun `eventDetail throws NoSuchEventException when data source returns null`() = runTest {
+    fun `instances drops events whose calendar the user hid`(@TempDir tempDir: Path) = runTest {
+        val prefs = newPrefs(tempDir)
+        prefs.setHiddenCalendarIds(setOf(2L))
+        val fake = FakeCalendarDataSource().apply {
+            instancesResult = { _, _ ->
+                listOf(
+                    makeEvent(10L, "Visible", calendarId = 1L),
+                    makeEvent(11L, "Hidden", calendarId = 2L),
+                )
+            }
+        }
+        val repo = CalendarRepositoryImpl(fake, prefs, UnconfinedTestDispatcher(testScheduler))
+
+        val range = Instant.fromEpochMilliseconds(0)..Instant.fromEpochMilliseconds(10_000L)
+        repo.instances(range).test {
+            assertThat(awaitItem().map { it.title }).containsExactly("Visible")
+            cancelAndIgnoreRemainingEvents()
+        }
+    }
+
+    @Test
+    fun `instances re-emits when the hidden set changes`(@TempDir tempDir: Path) = runTest {
+        val prefs = newPrefs(tempDir)
+        val fake = FakeCalendarDataSource().apply {
+            instancesResult = { _, _ ->
+                listOf(
+                    makeEvent(10L, "A", calendarId = 1L),
+                    makeEvent(11L, "B", calendarId = 2L),
+                )
+            }
+        }
+        val repo = CalendarRepositoryImpl(fake, prefs, UnconfinedTestDispatcher(testScheduler))
+
+        val range = Instant.fromEpochMilliseconds(0)..Instant.fromEpochMilliseconds(10_000L)
+        repo.instances(range).test {
+            assertThat(awaitItem().map { it.title }).containsExactly("A", "B").inOrder()
+
+            prefs.setHiddenCalendarIds(setOf(2L))
+
+            assertThat(awaitItem().map { it.title }).containsExactly("A")
+            cancelAndIgnoreRemainingEvents()
+        }
+    }
+
+    @Test
+    fun `createEvent delegates and returns the new id`(@TempDir tempDir: Path) = runTest {
+        val fake = FakeCalendarDataSource().apply { nextInsertId = 77L }
+        val repo = CalendarRepositoryImpl(fake, newPrefs(tempDir), Dispatchers.Unconfined)
+        val form = EventForm(
+            calendarId = 1L,
+            title = "Stand-up",
+            start = LocalDateTime(LocalDate(2026, 6, 12), LocalTime(9, 0)),
+            end = LocalDateTime(LocalDate(2026, 6, 12), LocalTime(9, 15)),
+        )
+
+        val id = repo.createEvent(form)
+
+        assertThat(id).isEqualTo(77L)
+        assertThat(fake.insertedForms).containsExactly(form)
+    }
+
+    @Test
+    fun `createEvent propagates write failures`(@TempDir tempDir: Path) = runTest {
+        val fake = FakeCalendarDataSource().apply {
+            writeError = WriteFailedException("insert event")
+        }
+        val repo = CalendarRepositoryImpl(fake, newPrefs(tempDir), Dispatchers.Unconfined)
+        val form = EventForm(
+            calendarId = 1L,
+            start = LocalDateTime(LocalDate(2026, 6, 12), LocalTime(9, 0)),
+            end = LocalDateTime(LocalDate(2026, 6, 12), LocalTime(10, 0)),
+        )
+
+        try {
+            repo.createEvent(form)
+            error("Expected WriteFailedException")
+        } catch (expected: WriteFailedException) {
+            assertThat(expected.message).contains("insert")
+        }
+    }
+
+    @Test
+    fun `deleteEvent delegates to the data source`(@TempDir tempDir: Path) = runTest {
+        val fake = FakeCalendarDataSource()
+        val repo = CalendarRepositoryImpl(fake, newPrefs(tempDir), Dispatchers.Unconfined)
+
+        repo.deleteEvent(eventId = 42L)
+
+        assertThat(fake.deletedEventIds).containsExactly(42L)
+        assertThat(fake.deletedOccurrences).isEmpty()
+    }
+
+    @Test
+    fun `deleteOccurrence forwards event id and begin time`(@TempDir tempDir: Path) = runTest {
+        val fake = FakeCalendarDataSource()
+        val repo = CalendarRepositoryImpl(fake, newPrefs(tempDir), Dispatchers.Unconfined)
+
+        repo.deleteOccurrence(eventId = 42L, beginMillis = 1_000L)
+
+        assertThat(fake.deletedOccurrences).containsExactly(42L to 1_000L)
+        assertThat(fake.deletedEventIds).isEmpty()
+    }
+
+    @Test
+    fun `deleteEvent propagates write failures`(@TempDir tempDir: Path) = runTest {
+        val fake = FakeCalendarDataSource().apply {
+            writeError = WriteFailedException("delete event id=42")
+        }
+        val repo = CalendarRepositoryImpl(fake, newPrefs(tempDir), Dispatchers.Unconfined)
+
+        try {
+            repo.deleteEvent(eventId = 42L)
+            error("Expected WriteFailedException")
+        } catch (expected: WriteFailedException) {
+            assertThat(expected.message).contains("42")
+        }
+    }
+
+    @Test
+    fun `eventDetail throws NoSuchEventException when data source returns null`(@TempDir tempDir: Path) = runTest {
         val fake = FakeCalendarDataSource().apply {
             eventDetailResult = { null }
         }
-        val repo = CalendarRepositoryImpl(fake, Dispatchers.Unconfined)
+        val repo = CalendarRepositoryImpl(fake, newPrefs(tempDir), Dispatchers.Unconfined)
 
         try {
             repo.eventDetail(eventId = 999L)

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

@@ -1,7 +1,14 @@
 package de.jeanlucmakiola.calendula.data.calendar
 
 import com.google.common.truth.Truth.assertThat
+import de.jeanlucmakiola.calendula.domain.AccessLevel
+import de.jeanlucmakiola.calendula.domain.AttendeeRelationship
 import de.jeanlucmakiola.calendula.domain.AttendeeStatus
+import de.jeanlucmakiola.calendula.domain.AttendeeType
+import de.jeanlucmakiola.calendula.domain.Availability
+import de.jeanlucmakiola.calendula.domain.EventStatus
+import de.jeanlucmakiola.calendula.domain.Reminder
+import de.jeanlucmakiola.calendula.domain.ReminderMethod
 import org.junit.jupiter.api.Test
 
 class EventDetailMapperTest {
@@ -19,6 +26,11 @@ class EventDetailMapperTest {
         allDay: Int = 0,
         location: String? = "Berlin",
         calendarId: Long = 7L,
+        status: Any? = null,
+        availability: Any? = null,
+        accessLevel: Any? = null,
+        timezone: String? = null,
+        selfStatus: Any? = null,
     ): MapColumnReader = MapColumnReader(
         EventDetailProjection.IDX_EVENT_ID to eventId,
         EventDetailProjection.IDX_TITLE to title,
@@ -32,18 +44,42 @@ class EventDetailMapperTest {
         EventDetailProjection.IDX_ALL_DAY to allDay,
         EventDetailProjection.IDX_LOCATION to location,
         EventDetailProjection.IDX_CALENDAR_ID to calendarId,
+        EventDetailProjection.IDX_STATUS to status,
+        EventDetailProjection.IDX_AVAILABILITY to availability,
+        EventDetailProjection.IDX_ACCESS_LEVEL to accessLevel,
+        EventDetailProjection.IDX_EVENT_TIMEZONE to timezone,
+        EventDetailProjection.IDX_SELF_ATTENDEE_STATUS to selfStatus,
     )
 
-    private fun attendeeReader(name: String?, email: String?, status: Int): MapColumnReader =
+    private fun attendeeReader(
+        name: String?,
+        email: String?,
+        status: Int,
+        relationship: Int = 0,
+        type: Int = 0,
+    ): MapColumnReader =
         MapColumnReader(
             AttendeeProjection.IDX_NAME to name,
             AttendeeProjection.IDX_EMAIL to email,
             AttendeeProjection.IDX_STATUS to status,
+            AttendeeProjection.IDX_RELATIONSHIP to relationship,
+            AttendeeProjection.IDX_TYPE to type,
         )
 
+    private fun reminderReader(minutes: Int, method: Int): MapColumnReader =
+        MapColumnReader(
+            ReminderProjection.IDX_MINUTES to minutes,
+            ReminderProjection.IDX_METHOD to method,
+        )
+
+    private fun MapColumnReader.toDetail(
+        attendees: List<de.jeanlucmakiola.calendula.domain.Attendee> = emptyList(),
+        reminders: List<Reminder> = emptyList(),
+    ) = toEventDetailCore(attendees, reminders)
+
     @Test
     fun `happy path detail maps all fields and embeds matching EventInstance`() {
-        val detail = detailReader().toEventDetailCore(attendees = emptyList())
+        val detail = detailReader().toDetail()
         assertThat(detail).isNotNull()
         assertThat(detail!!.description).isEqualTo("Body")
         assertThat(detail.organizer).isEqualTo("x@y")
@@ -55,21 +91,19 @@ class EventDetailMapperTest {
     @Test
     fun `event color falls back to calendar color when null`() {
         val detail = detailReader(eventColor = null, calendarColor = 0xFF112233.toInt())
-            .toEventDetailCore(attendees = emptyList())
+            .toDetail()
         assertThat(detail!!.instance.color).isEqualTo(0xFF112233.toInt())
     }
 
     @Test
     fun `dtend before dtstart drops detail`() {
-        val detail = detailReader(dtstart = 2000L, dtend = 1000L)
+        val detail = detailReader(dtstart = 2000L, dtend = 1000L).toDetail()
-            .toEventDetailCore(attendees = emptyList())
         assertThat(detail).isNull()
     }
 
     @Test
     fun `rrule passes through when present`() {
-        val detail = detailReader(rrule = "FREQ=WEEKLY;BYDAY=MO")
+        val detail = detailReader(rrule = "FREQ=WEEKLY;BYDAY=MO").toDetail()
-            .toEventDetailCore(attendees = emptyList())
         assertThat(detail!!.rrule).isEqualTo("FREQ=WEEKLY;BYDAY=MO")
     }
 
@@ -104,4 +138,82 @@ class EventDetailMapperTest {
         assertThat(attendeeReader("A", null, 1).toAttendee().email).isNull()
         assertThat(attendeeReader("A", "x@y", 1).toAttendee().email).isEqualTo("x@y")
     }
+
+    // RELATIONSHIP: NONE=0, ATTENDEE=1, ORGANIZER=2, PERFORMER=3, SPEAKER=4
+    @Test
+    fun `attendee relationship maps known integer codes`() {
+        assertThat(attendeeReader("A", "a@x", 1, relationship = 2).toAttendee().relationship)
+            .isEqualTo(AttendeeRelationship.Organizer)
+        assertThat(attendeeReader("A", "a@x", 1, relationship = 1).toAttendee().relationship)
+            .isEqualTo(AttendeeRelationship.Attendee)
+        assertThat(attendeeReader("A", "a@x", 1, relationship = 0).toAttendee().relationship)
+            .isEqualTo(AttendeeRelationship.None)
+    }
+
+    // TYPE: NONE=0, REQUIRED=1, OPTIONAL=2, RESOURCE=3
+    @Test
+    fun `attendee type maps known integer codes`() {
+        assertThat(attendeeReader("A", "a@x", 1, type = 1).toAttendee().type)
+            .isEqualTo(AttendeeType.Required)
+        assertThat(attendeeReader("A", "a@x", 1, type = 2).toAttendee().type)
+            .isEqualTo(AttendeeType.Optional)
+        assertThat(attendeeReader("A", "a@x", 1, type = 3).toAttendee().type)
+            .isEqualTo(AttendeeType.Resource)
+    }
+
+    // STATUS: TENTATIVE=0, CONFIRMED=1, CANCELED=2
+    @Test
+    fun `event status null maps to confirmed, codes map through`() {
+        assertThat(detailReader(status = null).toDetail()!!.status).isEqualTo(EventStatus.Confirmed)
+        assertThat(detailReader(status = 0).toDetail()!!.status).isEqualTo(EventStatus.Tentative)
+        assertThat(detailReader(status = 1).toDetail()!!.status).isEqualTo(EventStatus.Confirmed)
+        assertThat(detailReader(status = 2).toDetail()!!.status).isEqualTo(EventStatus.Cancelled)
+    }
+
+    // AVAILABILITY: BUSY=0, FREE=1, TENTATIVE=2
+    @Test
+    fun `availability null or busy maps to Busy, free maps to Free`() {
+        assertThat(detailReader(availability = null).toDetail()!!.availability)
+            .isEqualTo(Availability.Busy)
+        assertThat(detailReader(availability = 0).toDetail()!!.availability)
+            .isEqualTo(Availability.Busy)
+        assertThat(detailReader(availability = 1).toDetail()!!.availability)
+            .isEqualTo(Availability.Free)
+    }
+
+    // ACCESS_LEVEL: DEFAULT=0, CONFIDENTIAL=1, PRIVATE=2, PUBLIC=3
+    @Test
+    fun `access level maps known integer codes, null is Default`() {
+        assertThat(detailReader(accessLevel = null).toDetail()!!.accessLevel)
+            .isEqualTo(AccessLevel.Default)
+        assertThat(detailReader(accessLevel = 1).toDetail()!!.accessLevel)
+            .isEqualTo(AccessLevel.Confidential)
+        assertThat(detailReader(accessLevel = 2).toDetail()!!.accessLevel)
+            .isEqualTo(AccessLevel.Private)
+    }
+
+    @Test
+    fun `event timezone and self status pass through`() {
+        val detail = detailReader(timezone = "Europe/Berlin", selfStatus = 1).toDetail()
+        assertThat(detail!!.eventTimezone).isEqualTo("Europe/Berlin")
+        assertThat(detail.selfStatus).isEqualTo(AttendeeStatus.Accepted)
+    }
+
+    @Test
+    fun `reminders pass through to the detail`() {
+        val reminders = listOf(Reminder(10, ReminderMethod.Alert))
+        val detail = detailReader().toDetail(reminders = reminders)
+        assertThat(detail!!.reminders).isEqualTo(reminders)
+    }
+
+    // METHOD: DEFAULT=0, ALERT=1, EMAIL=2, SMS=3, ALARM=4
+    @Test
+    fun `reminder maps minutes and method codes`() {
+        assertThat(reminderReader(10, 1).toReminder())
+            .isEqualTo(Reminder(10, ReminderMethod.Alert))
+        assertThat(reminderReader(60, 2).toReminder())
+            .isEqualTo(Reminder(60, ReminderMethod.Email))
+        assertThat(reminderReader(0, 0).toReminder())
+            .isEqualTo(Reminder(0, ReminderMethod.Default))
+    }
 }

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

@@ -0,0 +1,74 @@
+package de.jeanlucmakiola.calendula.data.calendar
+
+import android.provider.CalendarContract
+import com.google.common.truth.Truth.assertThat
+import de.jeanlucmakiola.calendula.domain.AccessLevel
+import de.jeanlucmakiola.calendula.domain.Availability
+import de.jeanlucmakiola.calendula.domain.EventForm
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.LocalDateTime
+import kotlinx.datetime.LocalTime
+import org.junit.jupiter.api.Test
+import java.time.ZoneId
+
+class EventWriteMapperTest {
+
+    private val berlin: ZoneId = ZoneId.of("Europe/Berlin")
+
+    private fun form(
+        isAllDay: Boolean = false,
+        start: LocalDateTime = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(10, 0)),
+        end: LocalDateTime = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(11, 30)),
+    ): EventForm = EventForm(calendarId = 1L, isAllDay = isAllDay, start = start, end = end)
+
+    @Test
+    fun `timed event resolves wall clock in the given zone`() {
+        val times = form().toWriteTimes(berlin)
+        // 2026-06-11 is CEST (UTC+2): 10:00 local == 08:00Z.
+        assertThat(times.dtStartMillis).isEqualTo(1_781_164_800_000L)
+        assertThat(times.dtEndMillis - times.dtStartMillis).isEqualTo(90L * 60L * 1000L)
+        assertThat(times.timezone).isEqualTo("Europe/Berlin")
+    }
+
+    @Test
+    fun `all-day event lives at UTC midnights with exclusive end`() {
+        val times = form(isAllDay = true).toWriteTimes(berlin)
+        assertThat(times.timezone).isEqualTo("UTC")
+        assertThat(times.dtStartMillis % 86_400_000L).isEqualTo(0L)
+        // Single-day all-day event: DTEND is the NEXT UTC midnight.
+        assertThat(times.dtEndMillis - times.dtStartMillis).isEqualTo(86_400_000L)
+    }
+
+    @Test
+    fun `availability maps to the provider constants`() {
+        assertThat(Availability.Busy.toProviderValue())
+            .isEqualTo(CalendarContract.Events.AVAILABILITY_BUSY)
+        assertThat(Availability.Free.toProviderValue())
+            .isEqualTo(CalendarContract.Events.AVAILABILITY_FREE)
+        assertThat(Availability.Tentative.toProviderValue())
+            .isEqualTo(CalendarContract.Events.AVAILABILITY_TENTATIVE)
+    }
+
+    @Test
+    fun `access level maps to the provider constants`() {
+        assertThat(AccessLevel.Default.toProviderValue())
+            .isEqualTo(CalendarContract.Events.ACCESS_DEFAULT)
+        assertThat(AccessLevel.Private.toProviderValue())
+            .isEqualTo(CalendarContract.Events.ACCESS_PRIVATE)
+        assertThat(AccessLevel.Confidential.toProviderValue())
+            .isEqualTo(CalendarContract.Events.ACCESS_CONFIDENTIAL)
+        assertThat(AccessLevel.Public.toProviderValue())
+            .isEqualTo(CalendarContract.Events.ACCESS_PUBLIC)
+    }
+
+    @Test
+    fun `multi-day all-day event spans every covered day`() {
+        val times = form(
+            isAllDay = true,
+            start = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(0, 0)),
+            end = LocalDateTime(LocalDate(2026, 6, 13), LocalTime(0, 0)),
+        ).toWriteTimes(berlin)
+        // 11th, 12th, 13th inclusive = 3 days.
+        assertThat(times.dtEndMillis - times.dtStartMillis).isEqualTo(3L * 86_400_000L)
+    }
+}

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

@@ -2,6 +2,7 @@ package de.jeanlucmakiola.calendula.data.calendar
 
 import de.jeanlucmakiola.calendula.domain.CalendarSource
 import de.jeanlucmakiola.calendula.domain.EventDetail
+import de.jeanlucmakiola.calendula.domain.EventForm
 import de.jeanlucmakiola.calendula.domain.EventInstance
 
 /**
@@ -13,6 +14,14 @@ internal class FakeCalendarDataSource : CalendarDataSource {
     var calendarsResult: List<CalendarSource> = emptyList()
     var instancesResult: (Long, Long) -> List<EventInstance> = { _, _ -> emptyList() }
     var eventDetailResult: (Long) -> EventDetail? = { null }
+    /** Set to make the next write call throw. */
+    var writeError: Exception? = null
+    /** Id returned by the next [insertEvent]. */
+    var nextInsertId: Long = 100L
+
+    val insertedForms = mutableListOf<EventForm>()
+    val deletedEventIds = mutableListOf<Long>()
+    val deletedOccurrences = mutableListOf<Pair<Long, Long>>()
 
     private val listeners = mutableListOf<() -> Unit>()
 
@@ -20,6 +29,22 @@ internal class FakeCalendarDataSource : CalendarDataSource {
     override fun instances(beginMillis: Long, endMillis: Long): List<EventInstance> =
         instancesResult(beginMillis, endMillis)
     override fun eventDetail(eventId: Long): EventDetail? = eventDetailResult(eventId)
+
+    override fun insertEvent(form: EventForm): Long {
+        writeError?.let { throw it }
+        insertedForms += form
+        return nextInsertId
+    }
+
+    override fun deleteEvent(eventId: Long) {
+        writeError?.let { throw it }
+        deletedEventIds += eventId
+    }
+
+    override fun deleteOccurrence(eventId: Long, beginMillis: Long) {
+        writeError?.let { throw it }
+        deletedOccurrences += eventId to beginMillis
+    }
     override fun registerChangeListener(listener: () -> Unit) {
         listeners += listener
     }

app/src/test/java/de/jeanlucmakiola/calendula/data/prefs/SettingsPrefsTest.kt

@@ -0,0 +1,114 @@
+package de.jeanlucmakiola.calendula.data.prefs
+
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.PreferenceDataStoreFactory
+import androidx.datastore.preferences.core.Preferences
+import com.google.common.truth.Truth.assertThat
+import de.jeanlucmakiola.calendula.domain.EventFormField
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.test.runTest
+import kotlinx.datetime.DayOfWeek
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.io.TempDir
+import java.nio.file.Path
+import java.util.Locale
+
+class SettingsPrefsTest {
+
+    private fun newDataStore(tempDir: Path): DataStore<Preferences> =
+        PreferenceDataStoreFactory.create(
+            produceFile = { tempDir.resolve("settings_test.preferences_pb").toFile() },
+        )
+
+    @Test
+    fun `defaults are system theme, dynamic colour on, auto week start`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        assertThat(prefs.themeMode.first()).isEqualTo(ThemeMode.SYSTEM)
+        assertThat(prefs.dynamicColor.first()).isTrue()
+        assertThat(prefs.weekStart.first()).isEqualTo(WeekStartPref.AUTO)
+    }
+
+    @Test
+    fun `theme mode round-trips`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        prefs.setThemeMode(ThemeMode.DARK)
+        assertThat(prefs.themeMode.first()).isEqualTo(ThemeMode.DARK)
+    }
+
+    @Test
+    fun `dynamic colour round-trips`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        prefs.setDynamicColor(false)
+        assertThat(prefs.dynamicColor.first()).isFalse()
+    }
+
+    @Test
+    fun `week start round-trips`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        prefs.setWeekStart(WeekStartPref.SUNDAY)
+        assertThat(prefs.weekStart.first()).isEqualTo(WeekStartPref.SUNDAY)
+    }
+
+    @Test
+    fun `garbage stored enum falls back to default`(@TempDir tempDir: Path) = runTest {
+        val store = newDataStore(tempDir)
+        val prefs = SettingsPrefs(store)
+        store.updateData { p ->
+            val m = p.toMutablePreferences()
+            m[SettingsPrefs.THEME_MODE_KEY] = "PLAID"
+            m
+        }
+        assertThat(prefs.themeMode.first()).isEqualTo(ThemeMode.SYSTEM)
+    }
+
+    @Test
+    fun `form fields default to location and description`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        assertThat(prefs.defaultFormFields.first()).containsExactly(
+            EventFormField.Location,
+            EventFormField.Description,
+        )
+    }
+
+    @Test
+    fun `form field toggle round-trips`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        prefs.setFormFieldDefault(EventFormField.Reminders, enabled = true)
+        prefs.setFormFieldDefault(EventFormField.Location, enabled = false)
+        assertThat(prefs.defaultFormFields.first()).containsExactly(
+            EventFormField.Description,
+            EventFormField.Reminders,
+        )
+    }
+
+    @Test
+    fun `disabling every form field persists as none, not factory default`(@TempDir tempDir: Path) = runTest {
+        val prefs = SettingsPrefs(newDataStore(tempDir))
+        EventFormField.entries.forEach { prefs.setFormFieldDefault(it, enabled = false) }
+        assertThat(prefs.defaultFormFields.first()).isEmpty()
+    }
+
+    @Test
+    fun `unknown stored form-field names are dropped`(@TempDir tempDir: Path) = runTest {
+        val store = newDataStore(tempDir)
+        val prefs = SettingsPrefs(store)
+        store.updateData { p ->
+            val m = p.toMutablePreferences()
+            m[SettingsPrefs.FORM_FIELDS_KEY] = "Location,Hologram"
+            m
+        }
+        assertThat(prefs.defaultFormFields.first()).containsExactly(EventFormField.Location)
+    }
+
+    @Test
+    fun `explicit week-start prefs resolve regardless of locale`() {
+        assertThat(WeekStartPref.MONDAY.resolveFirstDay(Locale.US)).isEqualTo(DayOfWeek.MONDAY)
+        assertThat(WeekStartPref.SUNDAY.resolveFirstDay(Locale.GERMANY)).isEqualTo(DayOfWeek.SUNDAY)
+    }
+
+    @Test
+    fun `auto week start follows the locale convention`() {
+        assertThat(WeekStartPref.AUTO.resolveFirstDay(Locale.GERMANY)).isEqualTo(DayOfWeek.MONDAY)
+        assertThat(WeekStartPref.AUTO.resolveFirstDay(Locale.US)).isEqualTo(DayOfWeek.SUNDAY)
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/domain/EventFormTest.kt

@@ -0,0 +1,72 @@
+package de.jeanlucmakiola.calendula.domain
+
+import com.google.common.truth.Truth.assertThat
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.LocalDateTime
+import kotlinx.datetime.LocalTime
+import org.junit.jupiter.api.Test
+
+class EventFormTest {
+
+    private fun form(
+        calendarId: Long? = 1L,
+        isAllDay: Boolean = false,
+        start: LocalDateTime = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(10, 0)),
+        end: LocalDateTime = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(11, 0)),
+    ): EventForm = EventForm(calendarId = calendarId, isAllDay = isAllDay, start = start, end = end)
+
+    @Test
+    fun `valid timed form has no problems`() {
+        assertThat(form().problems()).isEmpty()
+    }
+
+    @Test
+    fun `missing calendar is a problem`() {
+        assertThat(form(calendarId = null).problems())
+            .containsExactly(EventFormProblem.NoCalendar)
+    }
+
+    @Test
+    fun `timed end before start is a problem`() {
+        val bad = form(end = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(9, 0)))
+        assertThat(bad.problems()).containsExactly(EventFormProblem.EndBeforeStart)
+    }
+
+    @Test
+    fun `zero-length timed event is allowed`() {
+        val instant = form(end = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(10, 0)))
+        assertThat(instant.problems()).isEmpty()
+    }
+
+    @Test
+    fun `all-day single day is allowed even though times match`() {
+        val allDay = form(
+            isAllDay = true,
+            start = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(0, 0)),
+            end = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(0, 0)),
+        )
+        assertThat(allDay.problems()).isEmpty()
+    }
+
+    @Test
+    fun `all-day end date before start date is a problem`() {
+        val bad = form(
+            isAllDay = true,
+            start = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(0, 0)),
+            end = LocalDateTime(LocalDate(2026, 6, 10), LocalTime(0, 0)),
+        )
+        assertThat(bad.problems()).containsExactly(EventFormProblem.EndBeforeStart)
+    }
+
+    @Test
+    fun `problems accumulate`() {
+        val bad = form(
+            calendarId = null,
+            end = LocalDateTime(LocalDate(2026, 6, 11), LocalTime(9, 0)),
+        )
+        assertThat(bad.problems()).containsExactly(
+            EventFormProblem.NoCalendar,
+            EventFormProblem.EndBeforeStart,
+        )
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/ui/filter/FilterGroupingTest.kt

@@ -0,0 +1,61 @@
+package de.jeanlucmakiola.calendula.ui.filter
+
+import com.google.common.truth.Truth.assertThat
+import de.jeanlucmakiola.calendula.domain.CalendarSource
+import org.junit.jupiter.api.Test
+
+class FilterGroupingTest {
+
+    private fun cal(
+        id: Long,
+        name: String,
+        account: String,
+        type: String = "com.example",
+    ) = CalendarSource(
+        id = id,
+        displayName = name,
+        accountName = account,
+        accountType = type,
+        color = 0xFF336699.toInt(),
+        isVisibleInSystem = true,
+    )
+
+    @Test
+    fun `groups calendars under their account, preserving order`() {
+        val calendars = listOf(
+            cal(1, "Personal", "alice@dav"),
+            cal(2, "Work", "alice@dav"),
+            cal(3, "Shared", "team@dav"),
+        )
+
+        val groups = groupByAccount(calendars, hidden = emptySet())
+
+        assertThat(groups.map { it.account }).containsExactly("alice@dav", "team@dav").inOrder()
+        assertThat(groups[0].calendars.map { it.displayName })
+            .containsExactly("Personal", "Work").inOrder()
+        assertThat(groups[1].calendars.map { it.id }).containsExactly(3L)
+    }
+
+    @Test
+    fun `hidden ids mark calendars not visible`() {
+        val calendars = listOf(
+            cal(1, "Personal", "alice@dav"),
+            cal(2, "Work", "alice@dav"),
+        )
+
+        val groups = groupByAccount(calendars, hidden = setOf(2L))
+        val rows = groups.single().calendars.associateBy { it.id }
+
+        assertThat(rows.getValue(1L).visible).isTrue()
+        assertThat(rows.getValue(2L).visible).isFalse()
+    }
+
+    @Test
+    fun `blank account name falls back to type`() {
+        val groups = groupByAccount(
+            listOf(cal(1, "Birthdays", account = "", type = "LOCAL")),
+            hidden = emptySet(),
+        )
+        assertThat(groups.single().account).isEqualTo("LOCAL")
+    }
+}

docs/superpowers/plans/2026-06-11-03-write-support.md

@@ -0,0 +1,109 @@
+# Calendula - Plan 03: Write Support (Milestone 2 / v2.0)
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Calendula kann Events anlegen, bearbeiten und löschen — direkt über
+`CalendarContract`-Writes, ohne eigene DB. Der V1-Spec dient als Leitplanke,
+nicht als Gesetz: Ausgeliefert wird in vier Slices (v1.1 → v2.0), jeder Slice
+ist für sich releasebar und lässt `./gradlew lint test assembleDebug` grün.
+
+**Architecture:** Writes laufen durch dieselbe Schichtung wie Reads:
+`ui/` → `CalendarRepository` (Interface) → `CalendarDataSource` →
+`ContentResolver.insert/update/delete`. Kein neuer Layer, keine Transaktions-
+Abstraktion — der Provider notified nach jedem Write selbst, der bestehende
+`ContentObserver`-Tick aktualisiert alle Views automatisch (F3 gilt unverändert).
+Domain bleibt pure Kotlin.
+
+**Leitentscheidungen (Abweichungen / Präzisierungen ggü. Spec §2 "V2"):**
+
+1. **Permission-Strategie:** `WRITE_CALENDAR` kommt ins Manifest. Das Onboarding
+   fragt READ+WRITE zusammen an (eine System-Dialog-Gruppe), zwingend bleibt
+   nur READ — wer Write ablehnt, nutzt die App weiter read-only.
+   v1.0-Upgrader (haben nur READ) bekommen den WRITE-Request kontextuell beim
+   ersten Schreib-Versuch. Onboarding-Footnote verliert die "Nur Lesezugriff"-
+   Behauptung (wäre mit Manifest-Eintrag gelogen).
+2. **Read-only-Kalender respektieren:** `Calendars.CALENDAR_ACCESS_LEVEL` wird
+   mitgelesen (`canModifyContents` = Level ≥ `CAL_ACCESS_CONTRIBUTOR`).
+   Edit/Delete-Actions erscheinen gar nicht erst für WebCal-Subscriptions,
+   Geburtstags- und andere read-only-Kalender.
+3. **Recurring Events:** Löschen bietet "Nur dieser Termin" (Exception-Insert
+   via `Events.CONTENT_EXCEPTION_URI` mit `STATUS_CANCELED` +
+   `ORIGINAL_INSTANCE_TIME`) vs. "Ganze Serie" (Delete der Events-Row).
+   Bearbeiten startet mit "ganze Serie"; Occurrence-Edit (Exception mit neuen
+   Werten) folgt erst, wenn das Serien-Edit stabil ist.
+4. **Kein RRULE-Editor in v1.2:** Create startet ohne Wiederholungs-UI
+   (einmalige Events). Ein einfacher Recurrence-Picker (täglich/wöchentlich/
+   monatlich/jährlich + Ende) kommt mit v1.3/v2.0.
+5. **Conflict UX (Spec V2 "event modified externally during edit"):** kein
+   Locking. Beim Speichern wird gegen die beim Laden gemerkte Row verglichen
+   (Dirty-Check auf den editierten Feldern); bei externem Konflikt Dialog
+   "Überschreiben / Verwerfen". Mehr ist YAGNI.
+
+---
+
+## Slices
+
+| Slice | Inhalt | Status |
+|---|---|---|
+| v1.1 | Write-Fundament: `WRITE_CALENDAR`, `canModifyContents`, Delete (Serie + einzelnes Vorkommen) | ausgeliefert (v1.1.0, 2026-06-11) |
+| v1.2 | Create: Event-Formular (Titel, Kalender, ganztägig, Start/Ende, Ort, Beschreibung), FAB, Default-Kalender-Pref | ausgeliefert (v1.2.0, 2026-06-11) |
+| v1.3 | Edit: Formular wiederverwendet, Serien-Edit, Reminder-Edit, einfacher Recurrence-Picker | offen |
+| v2.0 | Quick-Add, Occurrence-Edit, Konflikt-Dialog, Polish-Pass, Release | offen |
+
+## v1.1 — Write-Fundament + Delete
+
+**Build/Manifest:**
+- [x] `AndroidManifest.xml`: `WRITE_CALENDAR` ergänzen
+
+**Data layer:**
+- [x] `Projections.kt`: `CALENDAR_ACCESS_LEVEL` in `CalendarProjection`
+- [x] `Models.kt`: `CalendarSource.canModifyContents: Boolean` (Default `false`).
+      Kein neuer `FailureReason` — Delete-Fehler sind ein Snackbar-Fall, kein
+      Full-Screen-Failure
+- [x] `CalendarMapper.kt`: Access-Level → `canModifyContents`
+- [x] `CalendarDataSource`: `deleteEvent(eventId)`, `deleteOccurrence(eventId, beginMillis)`
+      — Impl in `AndroidCalendarDataSource` (`delete` auf Events-URI bzw.
+      Exception-Insert), `WriteFailedException` bei 0 rows / null-Uri
+- [x] `CalendarRepository(+Impl)`: beide Methoden durchreichen, auf `io`
+
+**UI:**
+- [x] `EventDetailUiState.Success.canModify` (Kalender-Lookup im ViewModel)
+- [x] `EventDetailViewModel`: `delete(mode)` mit eigenem One-Shot-State
+      (Idle/Deleting/Deleted/Failed); `SecurityException` → kontextueller
+      WRITE-Request statt Failure-Screen
+- [x] `EventDetailScreen`: Edit/Delete nur wenn `canModify`; Delete →
+      Confirm-Dialog (recurring: "Nur dieser Termin" / "Ganze Serie"),
+      Erfolg → zurück, Fehler → Snackbar
+- [x] Onboarding (`PermissionScreen`): `RequestMultiplePermissions` READ+WRITE,
+      Gate bleibt READ; Copy-Anpassung (Footnote, Rationale-Body) DE+EN
+
+**Tests:**
+- [x] `FakeCalendarDataSource`: Write-Ops aufnehmen
+- [x] `CalendarRepositoryImplTest`: delete-Pfade (Erfolg, Fehler)
+- [x] `CalendarMapperTest`: Access-Level-Mapping
+
+## v1.2 — Create
+
+- [x] `EventForm`-Domain-Modell + Validierung (`problems()`: EndBeforeStart,
+      NoCalendar; leerer Titel und Instant-Events erlaubt)
+- [x] `EventEditScreen` (ein Formular, ab v1.3 auch für Edit), M3-Date/Time-Picker
+- [x] FAB-Stack auf allen drei Hauptansichten (`CalendarFabColumn`: "+" immer,
+      Heute-Pill darüber), vorbelegt mit dem sichtbaren Tag
+- [x] Kalender-Vorauswahl: explizit > zuletzt benutzt
+      (`CalendarPrefs.lastUsedCalendarId` statt Settings-Eintrag) > erster
+      beschreibbarer; Picker bietet nur beschreibbare Kalender an
+- [x] `insertEvent(form): Long` im DataSource; `EventWriteMapper` (JVM-testbar)
+      normalisiert all-day auf UTC-Mitternächte mit exklusivem DTEND
+
+## v1.3 — Edit (Skizze)
+
+- Formular lädt `EventDetail`, Dirty-Check, `update` auf Events-Row
+- Reminder hinzufügen/entfernen (`Reminders`-Insert/Delete)
+- Einfacher Recurrence-Picker (FREQ + INTERVAL + UNTIL/COUNT)
+
+## v2.0 — Abschluss (Skizze)
+
+- Quick-Add-Sheet (Titel + Zeit, Rest Defaults)
+- Occurrence-Edit (Exception mit geänderten Werten)
+- Konflikt-Dialog beim Speichern
+- Changelog, F-Droid-Metadaten, Release-Tag

docs/superpowers/specs/2026-06-08-calendar-app-design.md

@@ -27,7 +27,7 @@ von Google Calendar gibt - speziell mit dem 2025er Expressive-Design.
 - 3 Hauptansichten: Monat, Woche, Tag
 - Event-Detail-Sheet (read-only Detailansicht)
 - Multi-Kalender-Toggle (Sichtbarkeit pro Kalender)
-- Heute-Button + Jump-to-Date
+- Heute-Button (Jump-to-Date gestrichen, siehe Out-of-Scope)
 - Settings-Screen (Theme, Dynamic Color, Wochenstart, Sprache)
 - Permission-Flow für `READ_CALENDAR`
 - Empty-States und Error-Recovery
@@ -35,6 +35,7 @@ von Google Calendar gibt - speziell mit dem 2025er Expressive-Design.
 - Tests + CI ab Tag 1
 
 ### Out-of-Scope (V2+)
+- Jump-to-Date / Datum-Picker (aus V1-Scope gestrichen)
 - Event-Create/Edit/Delete (V2)
 - Home-Screen-Widget
 - Volltextsuche
@@ -202,9 +203,9 @@ fragt Repository nur für sichtbaren Range an - kein "alle Events der Welt".
 - Immer erreichbar von allen Hauptansichten
 - State persistent (zuletzt aktive Ansicht)
 
-**M2 - Heute / Springe-zu-Datum**
+**M2 - Heute**
-- Schnell zurück zu "heute"
+- Schnell zurück zu "heute" (Drawer-Eintrag, ausgeliefert in v0.5)
-- Springe zu beliebigem Datum via Datum-Picker
+- ~~Springe zu beliebigem Datum via Datum-Picker~~ — **gestrichen**, siehe Out-of-Scope
 - Erreichbar von allen Hauptansichten
 
 **M3 - Kalender-Filter (Bottom-Sheet)**

gradle/libs.versions.toml

@@ -4,6 +4,7 @@ kotlin = "2.3.21"
 ksp = "2.3.9"
 hilt = "2.59.2"
 coreKtx = "1.19.0"
+appcompat = "1.7.1"
 lifecycleRuntime = "2.10.0"
 activityCompose = "1.13.0"
 composeBom = "2026.05.01"
@@ -27,6 +28,7 @@ androidxTestRules = "1.7.0"
 [libraries]
 # AndroidX core
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
+androidx-appcompat = { group = "androidx.appcompat", name = "appcompat", version.ref = "appcompat" }
 androidx-lifecycle-runtime-ktx = { group = "androidx.lifecycle", name = "lifecycle-runtime-ktx", version.ref = "lifecycleRuntime" }
 androidx-activity-compose = { group = "androidx.activity", name = "activity-compose", version.ref = "activityCompose" }