enable keepAlive for AppSettingsNotifier and appRouter

Author: melo936

src/lib/core/routing/app_router.dart

@@ -22,7 +22,7 @@ part 'app_router.g.dart';
 final _rootNavigatorKey = GlobalKey<NavigatorState>(debugLabel: 'root');
 final _shellNavigatorKey = GlobalKey<NavigatorState>(debugLabel: 'shell');
 
-@riverpod
+@Riverpod(keepAlive: true)
 GoRouter appRouter(Ref ref) {
   final router = GoRouter(
     navigatorKey: _rootNavigatorKey,

src/lib/core/settings/app_settings_provider.dart

@@ -16,7 +16,7 @@ part 'app_settings_provider.freezed.dart';
 
 enum NavigationIndicators { sticky, end }
 
-@riverpod
+@Riverpod(keepAlive: true)
 class AppSettingsNotifier extends _$AppSettingsNotifier {
   @override
   AppSettings build() {