Update router and DI for offline-first flow

- Add setup and onboarding routes to router
- Implement redirect logic for setup, onboarding, and mode checks
- Register local database and task datasource in DI container
- Add mode-aware task repository factory

lib/core/di/injection_container.dart

@@ -8,13 +8,17 @@ import '../../features/auth/data/datasources/auth_remote_datasource.dart';
 import '../../features/auth/data/repositories/auth_repository_impl.dart';
 import '../../features/auth/domain/repositories/auth_repository.dart';
 import '../../features/auth/presentation/viewmodels/auth_viewmodel.dart';
+import '../../features/settings/data/settings_local_datasource.dart';
+import '../../features/settings/domain/enums/app_mode.dart';
 import '../../features/settings/presentation/viewmodels/settings_viewmodel.dart';
+import '../../features/tasks/data/datasources/task_local_datasource.dart';
+import '../../features/tasks/data/datasources/task_remote_datasource.dart';
+import '../../features/tasks/data/repositories/local_task_repository_impl.dart';
+import '../../features/tasks/data/repositories/task_repository_impl.dart';
+import '../../features/tasks/domain/repositories/task_repository.dart';
 import '../../features/tasks/presentation/viewmodels/daily_tasks_viewmodel.dart';
 import '../../features/tasks/presentation/viewmodels/task_form_viewmodel.dart';
-import '../../features/tasks/domain/repositories/task_repository.dart';
-import '../../features/tasks/data/repositories/task_repository_impl.dart';
-import '../../features/tasks/data/datasources/task_remote_datasource.dart';
-import '../../features/settings/data/settings_local_datasource.dart';
+import '../database/app_database.dart';
 import '../logging/app_logger.dart';
 import '../network/authenticated_client.dart';
 
@@ -64,6 +68,14 @@ Future<void> init() async {
     ),
   );
 
+  // Settings Data Source (must be registered before SettingsViewModel)
+  getIt.registerLazySingleton<SettingsLocalDataSource>(
+    () => SettingsLocalDataSourceImpl(sharedPreferences: getIt()),
+  );
+
+  // Database (for local mode)
+  getIt.registerLazySingleton<AppDatabase>(() => AppDatabase());
+
   // Task Data sources
   getIt.registerLazySingleton<TaskRemoteDataSource>(
     () => TaskRemoteDataSourceImpl(
@@ -71,14 +83,28 @@ Future<void> init() async {
       client: getIt<http.Client>(),
     ),
   );
-  getIt.registerLazySingleton<SettingsLocalDataSource>(
-    () => SettingsLocalDataSourceImpl(sharedPreferences: getIt()),
+  getIt.registerLazySingleton<TaskLocalDataSource>(
+    () => TaskLocalDataSourceImpl(database: getIt()),
   );
 
-  // Repositories
-  getIt.registerLazySingleton<TaskRepository>(
-    () => TaskRepositoryImpl(remoteDataSource: getIt(), logger: getIt()),
+  // Task Repository (mode-aware)
+  // We use a factory that checks the current app mode
+  getIt.registerFactory<TaskRepository>(() {
+    final settingsDataSource = getIt<SettingsLocalDataSource>();
+    final appMode = settingsDataSource.getAppMode();
+
+    if (appMode == AppMode.local) {
+      return LocalTaskRepositoryImpl(
+        localDataSource: getIt(),
+        logger: getIt(),
       );
+    } else {
+      return TaskRepositoryImpl(
+        remoteDataSource: getIt(),
+        logger: getIt(),
+      );
+    }
+  });
 
   // ViewModels
   getIt.registerFactory<DailyTasksViewModel>(

lib/routing/app_router.dart

@@ -1,13 +1,17 @@
+import 'package:flutter/widgets.dart';
 import 'package:go_router/go_router.dart';
 
 import '../core/di/injection_container.dart';
 import '../features/auth/presentation/pages/login_page.dart';
 import '../features/auth/presentation/pages/register_page.dart';
 import '../features/auth/presentation/viewmodels/auth_viewmodel.dart';
-import '../features/tasks/presentation/pages/daily_agenda_page.dart';
-import '../features/tasks/presentation/pages/calendar_page.dart';
-import '../features/tasks/presentation/pages/task_form_page.dart';
+import '../features/onboarding/presentation/pages/onboarding_page.dart';
+import '../features/onboarding/presentation/pages/setup_page.dart';
 import '../features/settings/presentation/pages/settings_page.dart';
+import '../features/settings/presentation/viewmodels/settings_viewmodel.dart';
+import '../features/tasks/presentation/pages/calendar_page.dart';
+import '../features/tasks/presentation/pages/daily_agenda_page.dart';
+import '../features/tasks/presentation/pages/task_form_page.dart';
 
 class AppRouter {
   static GoRouter? _router;
@@ -18,13 +22,41 @@ class AppRouter {
   }
 
   static GoRouter _createRouter() {
+    final authViewModel = getIt<AuthViewModel>();
+    final settingsViewModel = getIt<SettingsViewModel>();
+
     return GoRouter(
       initialLocation: '/',
       redirect: (context, state) {
-        final authViewModel = getIt<AuthViewModel>();
+        final location = state.matchedLocation;
+
+        // 1. Check if setup is completed
+        if (!settingsViewModel.setupCompleted) {
+          if (location != '/setup') {
+            return '/setup';
+          }
+          return null;
+        }
+
+        // 2. Check if onboarding is shown
+        if (!settingsViewModel.onboardingShown) {
+          if (location != '/onboarding') {
+            return '/onboarding';
+          }
+          return null;
+        }
+
+        // 3. Local mode - allow access to main app, block auth routes
+        if (settingsViewModel.isLocalMode) {
+          if (location == '/login' || location == '/register') {
+            return '/';
+          }
+          return null;
+        }
+
+        // 4. Online mode - existing auth logic
         final isAuthenticated = authViewModel.isAuthenticated;
-        final isAuthRoute =
-            state.matchedLocation == '/login' || state.matchedLocation == '/register';
+        final isAuthRoute = location == '/login' || location == '/register';
 
         if (authViewModel.state == AuthState.initial) {
           return null;
@@ -40,8 +72,18 @@ class AppRouter {
 
         return null;
       },
-      refreshListenable: getIt<AuthViewModel>(),
+      refreshListenable: Listenable.merge([authViewModel, settingsViewModel]),
       routes: [
+        GoRoute(
+          path: '/setup',
+          name: 'setup',
+          builder: (context, state) => const SetupPage(),
+        ),
+        GoRoute(
+          path: '/onboarding',
+          name: 'onboarding',
+          builder: (context, state) => const OnboardingPage(),
+        ),
         GoRoute(
           path: '/login',
           name: 'login',