fix: resolve navigation-cache regressions and todo UX

apps/test/features/calendar/reminders/reminder_action_executor_test.dart

@@ -30,7 +30,6 @@ void main() {
       calendarService: calendarService,
       notificationService: notificationService,
       outboxStore: outboxStore,
-      isAppActive: () => true,
     );
   });
 
@@ -58,50 +57,13 @@ void main() {
     expect(pending, isEmpty);
   });
 
-  test(
-    'archive action should send remote archive immediately when app active',
-    () async {
-      when(
-        () => notificationService.cancelEventReminder('evt_live'),
-      ).thenAnswer((_) async {});
-      when(
-        () => calendarService.archiveEvent('evt_live'),
-      ).thenAnswer((_) async => null);
-
-      executor = ReminderActionExecutor(
-        calendarService: calendarService,
-        notificationService: notificationService,
-        outboxStore: outboxStore,
-        isAppActive: () => true,
-      );
-
-      await executor.handleAction(
-        action: ReminderAction.archive,
-        payload: ReminderPayload(
-          eventId: 'evt_live',
-          title: 'sync',
-          startAt: DateTime.parse('2026-03-18T16:00:00+08:00'),
-          timezone: 'Asia/Shanghai',
-        ),
-      );
-
-      verify(() => calendarService.archiveEvent('evt_live')).called(1);
-      final pending = await outboxStore.listPending();
-      expect(pending, isEmpty);
-    },
-  );
-
-  test('archive in inactive app writes pending outbox item', () async {
+  test('archive failure writes pending outbox item', () async {
     when(
       () => notificationService.cancelEventReminder('evt_1'),
     ).thenAnswer((_) async {});
-
-    executor = ReminderActionExecutor(
-      calendarService: calendarService,
-      notificationService: notificationService,
-      outboxStore: outboxStore,
-      isAppActive: () => false,
-    );
+    when(
+      () => calendarService.archiveEvent('evt_1'),
+    ).thenThrow(Exception('offline'));
 
     await executor.handleAction(
       action: ReminderAction.archive,
@@ -117,6 +79,7 @@ void main() {
     expect(pending.length, 1);
     expect(pending.first.eventId, 'evt_1');
     expect(pending.first.state, ReminderOutboxState.pending);
+    verify(() => calendarService.archiveEvent('evt_1')).called(1);
   });
 
   test('snooze reschedules +10m when event not expired', () async {

apps/test/features/todo/todo_repository_test.dart

@@ -12,7 +12,7 @@ class _MockTodoApi extends Mock implements TodoApi {}
 
 void main() {
   test(
-    'complete todo should optimistically update and invalidate pending list key',
+    'complete todo should optimistically remove item and invalidate pending list key',
     () async {
       final api = _MockTodoApi();
       final store = HybridCacheStore(
@@ -50,7 +50,7 @@ void main() {
       final updated = await store.read<CacheEntry<List<TodoResponse>>>(
         TodoRepository.pendingListKey,
       );
-      expect(updated?.value.first.status, 'completed');
+      expect(updated, isNull);
       expect(invalidator.wasInvalidated(TodoRepository.pendingListKey), true);
     },
   );