chore: complete v1.1 milestone

Archive v1.1 Calendar & Polish milestone artifacts (roadmap,
requirements, phase directories) to milestones/. Evolve PROJECT.md
with validated requirements and new key decisions. Update
RETROSPECTIVE.md with v1.1 section and cross-milestone trends.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.planning/milestones/v1.1-phases/06-task-history/06-CONTEXT.md

@@ -0,0 +1,81 @@
+# Phase 6: Task History - Context
+
+**Gathered:** 2026-03-16
+**Status:** Ready for planning
+
+<domain>
+## Phase Boundary
+
+Let users view past completion dates for any individual task. The data layer already records completions (TaskCompletions table + completeTask writes timestamps). This phase adds a DAO query and a UI to surface that data. Requirements: HIST-01 (verify recording works), HIST-02 (view history).
+
+</domain>
+
+<decisions>
+## Implementation Decisions
+
+### Entry point
+- From the task edit form (TaskFormScreen) in edit mode: add a "Verlauf" (History) button/row that opens the history view
+- From CalendarTaskRow: add onTap to navigate to the task edit form (currently only has checkbox) — history is then one tap away
+- No long-press or context menu — keep interaction model simple and consistent
+
+### History view format
+- Bottom sheet (showModalBottomSheet) — consistent with existing template_picker_sheet and icon_picker_sheet patterns
+- Each entry shows: date formatted as "dd.MM.yyyy" and time as "HH:mm" — German locale
+- Entries listed reverse-chronological (newest first)
+- No grouping or pagination — household tasks won't have thousands of completions; simple ListView is sufficient
+
+### Empty state
+- When task has never been completed: centered icon (e.g., Icons.history) + "Noch nie erledigt" message — meaningful, not just blank
+- No special state for many completions — just scroll
+
+### Claude's Discretion
+- Exact bottom sheet height and styling
+- Whether to show a completion count summary at the top of the sheet
+- Animation and transition details
+- DAO query structure (single method returning List<TaskCompletion>)
+- Whether CalendarTaskRow onTap goes to edit form or directly to history
+
+</decisions>
+
+<specifics>
+## Specific Ideas
+
+No specific requirements — user chose "You decide." Open to standard approaches that match existing app patterns.
+
+</specifics>
+
+<code_context>
+## Existing Code Insights
+
+### Reusable Assets
+- `TaskCompletions` table: Already exists in database.dart (id, taskId, completedAt) — no schema change needed
+- `TasksDao.completeTask()`: Already inserts into taskCompletions on every completion — HIST-01 data recording is done
+- `showModalBottomSheet`: Used by template_picker_sheet.dart and icon_picker_sheet.dart — established pattern for overlays
+- `AppLocalizations` + `.arb` files: German-only localization pipeline in place
+
+### Established Patterns
+- DAOs extend `DatabaseAccessor<AppDatabase>` with `@DriftAccessor` annotation
+- Riverpod `StreamProvider.autoDispose` or `FutureProvider` for reactive data
+- Feature folder structure: `features/tasks/data/`, `domain/`, `presentation/`
+- Bottom sheets use `showModalBottomSheet` with `DraggableScrollableSheet` or simple `Column`
+
+### Integration Points
+- `TaskFormScreen` (edit mode): Entry point for history — add a row/button when `isEditing`
+- `TasksDao`: Add `watchCompletionsForTask(int taskId)` or `getCompletionsForTask(int taskId)` method
+- `CalendarTaskRow`: Currently no onTap — needs navigation to task edit form for history access
+- `router.dart`: Route `/rooms/:roomId/tasks/:taskId` already exists for TaskFormScreen — no new route needed if using bottom sheet
+- `app_de.arb`: Add localization strings for history UI labels
+
+</code_context>
+
+<deferred>
+## Deferred Ideas
+
+None — discussion stayed within phase scope
+
+</deferred>
+
+---
+
+*Phase: 06-task-history*
+*Context gathered: 2026-03-16*