add adaptive_scaffold

mobile-v2/lib/presentation/components/scaffold/adaptive_route_secondary_appbar.widget.dart

@@ -0,0 +1,20 @@
+import 'package:auto_route/auto_route.dart';
+import 'package:flutter/material.dart';
+import 'package:immich_mobile/utils/extensions/build_context.extension.dart';
+
+class ImAdaptiveRouteSecondaryAppBar extends StatelessWidget
+    implements PreferredSizeWidget {
+  const ImAdaptiveRouteSecondaryAppBar({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return AppBar(
+      leading: context.isTablet
+          ? CloseButton(onPressed: () => context.maybePop())
+          : BackButton(onPressed: () => context.maybePop()),
+    );
+  }
+
+  @override
+  Size get preferredSize => const Size.fromHeight(kToolbarHeight);
+}