docs: create milestone v1.1 roadmap (3 phases)

.planning/ROADMAP.md

@@ -3,6 +3,7 @@
 ## Milestones
 
 - **v1.0 MVP** — Phases 1-4 (shipped 2026-03-16)
+- **v1.1 Calendar & Polish** — Phases 5-7 (in progress)
 
 ## Phases
 
@@ -18,6 +19,47 @@ See `milestones/v1.0-ROADMAP.md` for full phase details.
 
 </details>
 
+**v1.1 Calendar & Polish (Phases 5-7):**
+
+- [ ] **Phase 5: Calendar Strip** - Replace the stacked daily plan home screen with a horizontal scrollable date-strip and day-task list
+- [ ] **Phase 6: Task History** - Record every task completion with a timestamp and expose a per-task history view
+- [ ] **Phase 7: Task Sorting** - Add alphabetical, interval, and effort sort options to task lists
+
+## Phase Details
+
+### Phase 5: Calendar Strip
+**Goal**: Users navigate their tasks through a horizontal date-strip that replaces the stacked daily plan, seeing today's tasks by default and any day's tasks on tap
+**Depends on**: Phase 4 (v1.0 shipped — all data layer and scheduling in place)
+**Requirements**: CAL-01, CAL-02, CAL-03, CAL-04, CAL-05
+**Success Criteria** (what must be TRUE):
+  1. The home screen shows a horizontal scrollable strip of day cards, each displaying the German day abbreviation (Mo, Di, Mi...) and the date number
+  2. Tapping any day card updates the task list below the strip to show that day's tasks, with the selected card visually highlighted
+  3. On app launch the strip auto-scrolls so today's card is centered and selected by default
+  4. When two adjacent day cards span a month boundary, a subtle color shift or divider makes the boundary visible without extra chrome
+  5. Tasks that were not completed on their due date appear in subsequent days' lists with a red/orange accent marking them as overdue
+**Plans**: TBD
+
+### Phase 6: Task History
+**Goal**: Users can see exactly when each task was completed in the past, building trust that the scheduling loop is working correctly
+**Depends on**: Phase 5
+**Requirements**: HIST-01, HIST-02
+**Success Criteria** (what must be TRUE):
+  1. Every task completion (tap done in any view) is recorded in the database with a precise timestamp — data persists across app restarts
+  2. From a task's detail or context menu the user can open a history view listing all past completion dates for that task in reverse-chronological order
+  3. The history view shows a meaningful empty state if the task has never been completed
+**Plans**: TBD
+
+### Phase 7: Task Sorting
+**Goal**: Users can reorder task lists by the dimension most useful to them — name, how often the task recurs, or how much effort it requires
+**Depends on**: Phase 5
+**Requirements**: SORT-01, SORT-02, SORT-03
+**Success Criteria** (what must be TRUE):
+  1. A sort control (dropdown, segmented button, or similar) is visible on task list screens and persists the chosen sort across app restarts
+  2. Selecting alphabetical sort orders tasks A-Z by name within the visible list
+  3. Selecting interval sort orders tasks from most-frequent (daily) to least-frequent (yearly/custom) intervals
+  4. Selecting effort sort orders tasks from lowest effort to highest effort level
+**Plans**: TBD
+
 ## Progress
 
 | Phase | Milestone | Plans Complete | Status | Completed |
@@ -26,3 +68,6 @@ See `milestones/v1.0-ROADMAP.md` for full phase details.
 | 2. Rooms and Tasks | v1.0 | 5/5 | Complete | 2026-03-15 |
 | 3. Daily Plan and Cleanliness | v1.0 | 3/3 | Complete | 2026-03-16 |
 | 4. Notifications | v1.0 | 3/3 | Complete | 2026-03-16 |
+| 5. Calendar Strip | v1.1 | 0/? | Not started | - |
+| 6. Task History | v1.1 | 0/? | Not started | - |
+| 7. Task Sorting | v1.1 | 0/? | Not started | - |