add adaptive_scaffold

mobile-v2/lib/presentation/modules/settings/pages/about_settings.page.dart

@@ -0,0 +1,16 @@
+import 'package:auto_route/auto_route.dart';
+import 'package:flutter/material.dart';
+import 'package:immich_mobile/presentation/components/scaffold/adaptive_route_secondary_appbar.widget.dart';
+
+@RoutePage()
+class AboutSettingsPage extends StatelessWidget {
+  const AboutSettingsPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      appBar: ImAdaptiveRouteSecondaryAppBar(),
+      body: Center(child: Text('About Settings')),
+    );
+  }
+}