refactor(mobile): app settings (#7749)

* refactor(mobile): app settings

* Font size

* refactor(mobile): backup settings ui (#7771)

* refactor: SettingsButtonListTile

* refactor: Backup settings to App settings

---------

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>

* fix: invalidate appsettingsprovider on timeline setting change

* styling

---------

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>
Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

mobile/lib/routing/router.gr.dart

@@ -299,6 +299,16 @@ abstract class _$AppRouter extends RootStackRouter {
         child: const SettingsPage(),
       );
     },
+    SettingsSubRoute.name: (routeData) {
+      final args = routeData.argsAs<SettingsSubRouteArgs>();
+      return AutoRoutePage<dynamic>(
+        routeData: routeData,
+        child: SettingsSubPage(
+          args.section,
+          key: args.key,
+        ),
+      );
+    },
     SharedLinkEditRoute.name: (routeData) {
       final args = routeData.argsAs<SharedLinkEditRouteArgs>(
           orElse: () => const SharedLinkEditRouteArgs());
@@ -1260,6 +1270,44 @@ class SettingsRoute extends PageRouteInfo<void> {
   static const PageInfo<void> page = PageInfo<void>(name);
 }
 
+/// generated route for
+/// [SettingsSubPage]
+class SettingsSubRoute extends PageRouteInfo<SettingsSubRouteArgs> {
+  SettingsSubRoute({
+    required SettingSection section,
+    Key? key,
+    List<PageRouteInfo>? children,
+  }) : super(
+          SettingsSubRoute.name,
+          args: SettingsSubRouteArgs(
+            section: section,
+            key: key,
+          ),
+          initialChildren: children,
+        );
+
+  static const String name = 'SettingsSubRoute';
+
+  static const PageInfo<SettingsSubRouteArgs> page =
+      PageInfo<SettingsSubRouteArgs>(name);
+}
+
+class SettingsSubRouteArgs {
+  const SettingsSubRouteArgs({
+    required this.section,
+    this.key,
+  });
+
+  final SettingSection section;
+
+  final Key? key;
+
+  @override
+  String toString() {
+    return 'SettingsSubRouteArgs{section: $section, key: $key}';
+  }
+}
+
 /// generated route for
 /// [SharedLinkEditPage]
 class SharedLinkEditRoute extends PageRouteInfo<SharedLinkEditRouteArgs> {