docs(04-03): complete Phase 4 verification gate plan

- dart analyze --fatal-infos: zero issues
- flutter test: 89/89 tests pass (72 original + 12 notification + 5 settings widget)
- NOTF-01 confirmed: NotificationService, DailyPlanDao queries, Android config, timezone init
- NOTF-02 confirmed: NotificationSettingsNotifier, SettingsScreen section, toggle, time picker
- Phase 4 (Notifications) fully complete — all 4 phases of v1.0 milestone done

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

.planning/phases/04-notifications/04-03-SUMMARY.md

@@ -0,0 +1,98 @@
+---
+phase: 04-notifications
+plan: 03
+subsystem: testing
+tags: [flutter, dart-analyze, flutter-test, verification]
+
+# Dependency graph
+requires:
+  - phase: 04-notifications/04-01
+    provides: NotificationService, NotificationSettingsNotifier, DailyPlanDao queries, Android config, timezone init, ARB strings
+  - phase: 04-notifications/04-02
+    provides: SettingsScreen Benachrichtigungen section, permission flow, scheduling integration, widget tests
+
+provides:
+  - Phase 4 verification gate passed: dart analyze clean, 89/89 tests pass
+  - All NOTF-01 artifacts confirmed present and functional
+  - All NOTF-02 artifacts confirmed present and functional
+
+affects: [phase completion]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: []
+
+key-files:
+  created: []
+  modified: []
+
+key-decisions:
+  - "Phase 4 verification gate passed: dart analyze --fatal-infos zero issues, 89/89 tests passing (72 original + 12 notification unit + 5 notification settings widget)"
+
+patterns-established: []
+
+requirements-completed: [NOTF-01, NOTF-02]
+
+# Metrics
+duration: 2min
+completed: 2026-03-16
+---
+
+# Phase 4 Plan 3: Phase 4 Verification Gate Summary
+
+**dart analyze --fatal-infos zero issues and 89/89 tests passing confirming NOTF-01 (NotificationService, DailyPlanDao queries, Android config, timezone init) and NOTF-02 (NotificationSettingsNotifier, SettingsScreen Benachrichtigungen section, SwitchListTile, AnimatedSize time picker) fully implemented**
+
+## Performance
+
+- **Duration:** 2 min
+- **Started:** 2026-03-16T14:10:51Z
+- **Completed:** 2026-03-16T14:12:07Z
+- **Tasks:** 1
+- **Files modified:** 0
+
+## Accomplishments
+- `dart analyze --fatal-infos` passed with zero issues
+- `flutter test` passed: 89/89 tests (72 pre-Phase-4 + 12 notification unit tests + 5 notification settings widget tests)
+- NOTF-01 artifacts confirmed: `NotificationService` with `scheduleDailyNotification`, `requestPermission`, `cancelAll`; `DailyPlanDao` with `getOverdueAndTodayTaskCount` and `getOverdueTaskCount`; AndroidManifest with `POST_NOTIFICATIONS`, `RECEIVE_BOOT_COMPLETED`, `ScheduledNotificationBootReceiver exported="true"`; `build.gradle.kts` with `isCoreLibraryDesugaringEnabled = true` and `compileSdk = 35`; `main.dart` with timezone init chain and `NotificationService().initialize()`
+- NOTF-02 artifacts confirmed: `NotificationSettingsNotifier` with `setEnabled` and `setTime`; `SettingsScreen` with `SwitchListTile` and `AnimatedSize` notification section; `app_de.arb` with all 7 notification keys (`settingsSectionNotifications`, `notificationsEnabledLabel`, `notificationsTimeLabel`, `notificationsPermissionDeniedHint`, `notificationTitle`, `notificationBody`, `notificationBodyWithOverdue`)
+- Notification tap navigation confirmed: `_onTap` calls `router.go('/')`
+
+## Task Commits
+
+No source code commits required — verification-only task.
+
+**Plan metadata:** (docs commit — see final commit hash below)
+
+## Files Created/Modified
+None — pure verification gate.
+
+## Decisions Made
+None - followed plan as specified. All artifacts were already present from Plans 01 and 02.
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+None — all checks passed on first run.
+
+## User Setup Required
+None — no external service configuration required.
+
+## Next Phase Readiness
+- Phase 4 (Notifications) is fully complete and verified
+- All 4 phases of the v1.0 milestone are complete
+- 89 tests passing, zero analysis issues
+- App delivers on core value: users see what needs doing today, mark it done, get daily reminders, trust recurring scheduling
+
+---
+*Phase: 04-notifications*
+*Completed: 2026-03-16*
+
+## Self-Check: PASSED
+
+- lib/core/notifications/notification_service.dart: FOUND
+- lib/core/notifications/notification_settings_notifier.dart: FOUND
+- lib/features/settings/presentation/settings_screen.dart: FOUND
+- .planning/phases/04-notifications/04-03-SUMMARY.md: FOUND