add dropdown

lib/features/users/presentation/providers/users_provider.dart

@@ -0,0 +1,54 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../domain/usecases/get_users_usecase.dart';
+import '../../domain/usecases/sync_users_usecase.dart';
+import 'users_state.dart';
+
+/// State notifier for users
+class UsersNotifier extends StateNotifier<UsersState> {
+  final GetUsersUseCase getUsersUseCase;
+  final SyncUsersUseCase syncUsersUseCase;
+
+  UsersNotifier({
+    required this.getUsersUseCase,
+    required this.syncUsersUseCase,
+  }) : super(const UsersState());
+
+  /// Get users from local storage (or API if not cached)
+  Future<void> getUsers() async {
+    state = state.copyWith(isLoading: true, error: null);
+
+    final result = await getUsersUseCase();
+
+    result.fold(
+      (failure) => state = state.copyWith(
+        isLoading: false,
+        error: failure.message,
+      ),
+      (users) => state = state.copyWith(
+        users: users,
+        isLoading: false,
+        error: null,
+      ),
+    );
+  }
+
+  /// Sync users from API (force refresh)
+  Future<void> syncUsers() async {
+    state = state.copyWith(isLoading: true, error: null);
+
+    final result = await syncUsersUseCase();
+
+    result.fold(
+      (failure) => state = state.copyWith(
+        isLoading: false,
+        error: failure.message,
+      ),
+      (users) => state = state.copyWith(
+        users: users,
+        isLoading: false,
+        error: null,
+      ),
+    );
+  }
+}