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/07-task-sorting/07-02-SUMMARY.md

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+---
+phase: 07-task-sorting
+plan: 02
+subsystem: ui
+tags: [flutter, riverpod, material3, popup-menu, sort-ui, localization]
+
+# Dependency graph
+requires:
+  - phase: 07-task-sorting
+    plan: 01
+    provides: sortPreferenceProvider, TaskSortOption enum, German sort l10n strings
+
+provides:
+  - SortDropdown ConsumerWidget (PopupMenuButton<TaskSortOption> with check marks)
+  - HomeScreen with AppBar (title: Übersicht, actions: SortDropdown)
+  - TaskListScreen AppBar with SortDropdown before edit/delete buttons
+
+affects: [home_screen_test.dart, app_shell_test.dart, any screen showing HomeScreen]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "PopupMenuButton<TaskSortOption> with Opacity check mark — avoids layout shift vs conditional Icon"
+    - "Nested Scaffold inside AppShell tab body — standard pattern for per-tab AppBars in StatefulShellRoute"
+
+key-files:
+  created:
+    - lib/features/tasks/presentation/sort_dropdown.dart
+  modified:
+    - lib/features/home/presentation/home_screen.dart
+    - lib/features/tasks/presentation/task_list_screen.dart
+    - test/features/home/presentation/home_screen_test.dart
+    - test/shell/app_shell_test.dart
+
+key-decisions:
+  - "Used PopupMenuButton instead of DropdownButton for AppBar — menu overlay vs inline expansion, consistent with Material 3 AppBar action patterns"
+  - "Opacity(opacity: isSelected ? 1 : 0) for check mark — preserves item width alignment vs conditional show/hide"
+  - "HomeScreen Scaffold is nested inside AppShell Scaffold — standard StatefulShellRoute pattern for per-tab AppBars"
+
+# Metrics
+duration: 4min
+completed: 2026-03-16
+---
+
+# Phase 07 Plan 02: Sort Dropdown UI Summary
+
+**SortDropdown ConsumerWidget using PopupMenuButton wired into HomeScreen AppBar (title: Übersicht) and TaskListScreen AppBar before edit/delete actions**
+
+## Performance
+
+- **Duration:** 4 min
+- **Started:** 2026-03-16T21:35:56Z
+- **Completed:** 2026-03-16T21:39:24Z
+- **Tasks:** 2
+- **Files modified:** 5 (1 created, 4 modified)
+
+## Accomplishments
+
+- SortDropdown ConsumerWidget: PopupMenuButton<TaskSortOption> with sort icon, current label, and check mark on active option
+- HomeScreen wrapped in Scaffold with AppBar titled "Übersicht" and SortDropdown in trailing actions
+- TaskListScreen AppBar has SortDropdown before the existing edit/delete IconButtons
+- 2 new tests in HomeScreen test suite: verifies PopupMenuButton and AppBar title presence
+- Auto-fixed app_shell_test regression caused by "Übersicht" now appearing twice (AppBar + bottom nav)
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: SortDropdown widget and HomeScreen/TaskListScreen integration** - `e5eccb7` (feat)
+2. **Task 2: Sort dropdown tests and AppShell test fix** - `a3e4d02` (feat)
+
+## Files Created/Modified
+
+- `lib/features/tasks/presentation/sort_dropdown.dart` - Reusable SortDropdown ConsumerWidget with PopupMenuButton<TaskSortOption>
+- `lib/features/home/presentation/home_screen.dart` - Added Scaffold with AppBar (Übersicht title + SortDropdown)
+- `lib/features/tasks/presentation/task_list_screen.dart` - Added SortDropdown before edit/delete in AppBar actions
+- `test/features/home/presentation/home_screen_test.dart` - Added sortPreferenceProvider override + 2 new sort dropdown tests
+- `test/shell/app_shell_test.dart` - Fixed findsOneWidget -> findsWidgets for 'Übersicht' (now in AppBar + bottom nav)
+
+## Decisions Made
+
+- Used PopupMenuButton instead of DropdownButton for AppBar actions — menu overlay is cleaner in AppBar context (Material 3)
+- Opacity trick for check mark: `Opacity(opacity: isSelected ? 1 : 0)` preserves item width so labels align regardless of selection
+- HomeScreen uses nested Scaffold for AppBar — standard pattern in StatefulShellRoute.indexedStack; AppShell provides bottom nav, HomeScreen provides AppBar
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 1 - Bug] Fixed AppShell test regression from 'Übersicht' duplicate**
+- **Found during:** Task 2 test run
+- **Issue:** `app_shell_test.dart` expected `findsOneWidget` for 'Übersicht'. Adding the HomeScreen AppBar title caused the string to appear twice (AppBar + bottom nav label).
+- **Fix:** Changed `findsOneWidget` to `findsWidgets` in `app_shell_test.dart` line 67. Applied same fix to new `home_screen_test.dart` AppBar title test.
+- **Files modified:** `test/shell/app_shell_test.dart`, `test/features/home/presentation/home_screen_test.dart`
+- **Commit:** `a3e4d02`
+
+## Issues Encountered
+
+None beyond the auto-fixed regression.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+
+- Phase 07 (task sorting) is now complete: data layer (07-01) + UI layer (07-02)
+- Sort dropdown is live in both HomeScreen and TaskListScreen AppBars
+- Selecting a sort option reactively reorders task lists via sortPreferenceProvider
+- Preference persists across app restarts via SharedPreferences
+
+---
+*Phase: 07-task-sorting*
+*Completed: 2026-03-16*
+
+## Self-Check: PASSED
+
+- FOUND: lib/features/tasks/presentation/sort_dropdown.dart
+- FOUND: lib/features/home/presentation/home_screen.dart (modified)
+- FOUND: lib/features/tasks/presentation/task_list_screen.dart (modified)
+- FOUND: test/features/home/presentation/home_screen_test.dart (modified)
+- FOUND: test/shell/app_shell_test.dart (modified)
+- Commits e5eccb7, a3e4d02 verified in git log
+- All 115 tests pass, dart analyze clean