fix(mobile): Do not show version announcement if user is not admin. (#3703)

mobile/lib/shared/providers/admin_provider.dart

@@ -0,0 +1,7 @@
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/shared/providers/user.provider.dart';
+
+final isAdminProvider = Provider<bool>((ref) {
+  final currentUser = ref.watch(currentUserProvider);
+  return currentUser?.isAdmin ?? false;  // Default to non-admin if no user
+});