refactor(router)!: make account routes top-level modal dialogs

BREAKING Overhauls the routing for all account-related pages.

The routes for Settings, Manage Followed Items, Saved Headlines, and Saved Filters have been moved from being nested under /feed to the top level of the router configuration.

Their definitions have been changed from using builder to pageBuilder, which returns a MaterialPage with fullscreenDialog: true. This ensures that when navigated to, they will appear as full-screen modal dialogs that cover the entire application, including the main AppShell. This change aligns the navigation behavior with the desired user experience for account management.

Author: fulleni

lib/router/router.dart

@@ -369,6 +369,180 @@ GoRouter createRouter({
           );
         },
       ),
+      // --- Account-related routes (Top-Level Modals) ---
+      // These routes are for pages launched from the AccountSheet. They are
+      // defined at the top level and use `fullscreenDialog: true` to be
+      // presented modally over the entire app, including the AppShell.
+
+      // ShellRoute for settings to provide SettingsBloc to children
+      ShellRoute(
+        builder: (
+          BuildContext context,
+          GoRouterState state,
+          Widget child,
+        ) {
+          final appBloc = context.read<AppBloc>();
+          final userId = appBloc.state.user?.id;
+
+          return BlocProvider<SettingsBloc>(
+            create: (context) {
+              final settingsBloc = SettingsBloc(
+                userAppSettingsRepository:
+                    context.read<DataRepository<UserAppSettings>>(),
+                inlineAdCacheService: inlineAdCacheService,
+              );
+              if (userId != null) {
+                settingsBloc.add(
+                  SettingsLoadRequested(userId: userId),
+                );
+              } else {
+                logger.warning(
+                  'User ID is null when creating SettingsBloc. '
+                  'Settings will not be loaded.',
+                );
+              }
+              return settingsBloc;
+            },
+            child: child,
+          );
+        },
+        routes: [
+          GoRoute(
+            path: Routes.settings,
+            name: Routes.settingsName,
+            pageBuilder: (context, state) => const MaterialPage(
+              fullscreenDialog: true,
+              child: SettingsPage(),
+            ),
+            routes: [
+              GoRoute(
+                path: Routes.settingsAppearance,
+                name: Routes.settingsAppearanceName,
+                builder: (context, state) => const AppearanceSettingsPage(),
+                routes: [
+                  GoRoute(
+                    path: Routes.settingsAppearanceTheme,
+                    name: Routes.settingsAppearanceThemeName,
+                    builder: (context, state) => const ThemeSettingsPage(),
+                  ),
+                  GoRoute(
+                    path: Routes.settingsAppearanceFont,
+                    name: Routes.settingsAppearanceFontName,
+                    builder: (context, state) => const FontSettingsPage(),
+                  ),
+                ],
+              ),
+              GoRoute(
+                path: Routes.settingsFeed,
+                name: Routes.settingsFeedName,
+                builder: (context, state) => const FeedSettingsPage(),
+              ),
+              GoRoute(
+                path: Routes.settingsNotifications,
+                name: Routes.settingsNotificationsName,
+                builder: (context, state) => const NotificationSettingsPage(),
+              ),
+              GoRoute(
+                path: Routes.settingsLanguage,
+                name: Routes.settingsLanguageName,
+                builder: (context, state) => const LanguageSettingsPage(),
+              ),
+            ],
+          ),
+        ],
+      ),
+      GoRoute(
+        path: Routes.manageFollowedItems,
+        name: Routes.manageFollowedItemsName,
+        pageBuilder: (context, state) => const MaterialPage(
+          fullscreenDialog: true,
+          child: ManageFollowedItemsPage(),
+        ),
+        routes: [
+          GoRoute(
+            path: Routes.followedTopicsList,
+            name: Routes.followedTopicsListName,
+            builder: (context, state) => const FollowedTopicsListPage(),
+            routes: [
+              GoRoute(
+                path: Routes.addTopicToFollow,
+                name: Routes.addTopicToFollowName,
+                builder: (context, state) => const AddTopicToFollowPage(),
+              ),
+            ],
+          ),
+          GoRoute(
+            path: Routes.followedSourcesList,
+            name: Routes.followedSourcesListName,
+            builder: (context, state) => const FollowedSourcesListPage(),
+            routes: [
+              GoRoute(
+                path: Routes.addSourceToFollow,
+                name: Routes.addSourceToFollowName,
+                builder: (context, state) => const AddSourceToFollowPage(),
+              ),
+            ],
+          ),
+          GoRoute(
+            path: Routes.followedCountriesList,
+            name: Routes.followedCountriesListName,
+            builder: (context, state) => const FollowedCountriesListPage(),
+            routes: [
+              GoRoute(
+                path: Routes.addCountryToFollow,
+                name: Routes.addCountryToFollowName,
+                builder: (context, state) => const AddCountryToFollowPage(),
+              ),
+            ],
+          ),
+        ],
+      ),
+      GoRoute(
+        path: Routes.accountSavedHeadlines,
+        name: Routes.accountSavedHeadlinesName,
+        pageBuilder: (context, state) => const MaterialPage(
+          fullscreenDialog: true,
+          child: SavedHeadlinesPage(),
+        ),
+        routes: [
+          GoRoute(
+            path: Routes.accountArticleDetails,
+            name: Routes.accountArticleDetailsName,
+            builder: (context, state) {
+              final headlineFromExtra = state.extra as Headline?;
+              final headlineIdFromPath = state.pathParameters['id'];
+              return MultiBlocProvider(
+                providers: [
+                  BlocProvider(
+                    create: (context) => HeadlineDetailsBloc(
+                      headlinesRepository:
+                          context.read<DataRepository<Headline>>(),
+                    ),
+                  ),
+                  BlocProvider(
+                    create: (context) => SimilarHeadlinesBloc(
+                      headlinesRepository:
+                          context.read<DataRepository<Headline>>(),
+                    ),
+                  ),
+                ],
+                child: HeadlineDetailsPage(
+                  initialHeadline: headlineFromExtra,
+                  headlineId: headlineFromExtra?.id ?? headlineIdFromPath,
+                ),
+              );
+            },
+          ),
+        ],
+      ),
+      GoRoute(
+        path: Routes.accountSavedFilters,
+        name: Routes.accountSavedFiltersName,
+        pageBuilder: (context, state) => const MaterialPage(
+          fullscreenDialog: true,
+          child: SavedFiltersPage(),
+        ),
+      ),
       // --- Main App Shell ---
       StatefulShellRoute.indexedStack(
         builder: (context, state, navigationShell) {