add dropdown

lib/features/users/domain/usecases/get_users_usecase.dart

@@ -0,0 +1,18 @@
+import 'package:dartz/dartz.dart';
+
+import '../../../../core/errors/failures.dart';
+import '../entities/user_entity.dart';
+import '../repositories/users_repository.dart';
+
+/// Use case for getting users
+/// Follows local-first strategy: returns local users if available,
+/// otherwise syncs from API
+class GetUsersUseCase {
+  final UsersRepository repository;
+
+  GetUsersUseCase(this.repository);
+
+  Future<Either<Failure, List<UserEntity>>> call() async {
+    return await repository.getUsers();
+  }
+}