add dropdown

lib/features/users/domain/entities/user_entity.dart

@@ -0,0 +1,78 @@
+import 'package:equatable/equatable.dart';
+
+/// User entity representing a user in the system
+class UserEntity extends Equatable {
+  final int id;
+  final String firstName;
+  final String name;
+  final String? plateNumber;
+  final String email;
+  final String phone;
+  final bool isParent;
+  final String fullName;
+  final String fullNameEmail;
+  final String? referralCode;
+  final String? avatar;
+  final int departmentId;
+  final bool isWareHouseUser;
+  final int? wareHouseId;
+  final int roleId;
+
+  const UserEntity({
+    required this.id,
+    required this.firstName,
+    required this.name,
+    this.plateNumber,
+    required this.email,
+    required this.phone,
+    this.isParent = false,
+    required this.fullName,
+    required this.fullNameEmail,
+    this.referralCode,
+    this.avatar,
+    required this.departmentId,
+    this.isWareHouseUser = false,
+    this.wareHouseId,
+    required this.roleId,
+  });
+
+  @override
+  List<Object?> get props => [
+        id,
+        firstName,
+        name,
+        plateNumber,
+        email,
+        phone,
+        isParent,
+        fullName,
+        fullNameEmail,
+        referralCode,
+        avatar,
+        departmentId,
+        isWareHouseUser,
+        wareHouseId,
+        roleId,
+      ];
+
+  /// Get display name
+  String get displayName {
+    if (fullName.isNotEmpty) return fullName;
+    if (name.isNotEmpty) return name;
+    return email;
+  }
+
+  /// Get initials from name (for avatar display)
+  String get initials {
+    if (firstName.isNotEmpty && name.isNotEmpty) {
+      return (firstName.substring(0, 1) + name.substring(0, 1)).toUpperCase();
+    }
+    final parts = fullName.trim().split(' ');
+    if (parts.isEmpty) return '?';
+    if (parts.length == 1) {
+      return parts[0].substring(0, 1).toUpperCase();
+    }
+    return (parts[0].substring(0, 1) + parts[parts.length - 1].substring(0, 1))
+        .toUpperCase();
+  }
+}

lib/features/users/domain/repositories/users_repository.dart

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+import 'package:dartz/dartz.dart';
+
+import '../../../../core/errors/failures.dart';
+import '../entities/user_entity.dart';
+
+/// Abstract repository interface for users
+abstract class UsersRepository {
+  /// Get all users (from local storage if available, otherwise from API)
+  Future<Either<Failure, List<UserEntity>>> getUsers();
+
+  /// Sync users from API and save to local storage
+  Future<Either<Failure, List<UserEntity>>> syncUsers();
+
+  /// Clear all users from local storage
+  Future<Either<Failure, void>> clearUsers();
+}

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

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+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();
+  }
+}

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

@@ -0,0 +1,17 @@
+import 'package:dartz/dartz.dart';
+
+import '../../../../core/errors/failures.dart';
+import '../entities/user_entity.dart';
+import '../repositories/users_repository.dart';
+
+/// Use case for syncing users from API
+/// Forces refresh from API and saves to local storage
+class SyncUsersUseCase {
+  final UsersRepository repository;
+
+  SyncUsersUseCase(this.repository);
+
+  Future<Either<Failure, List<UserEntity>>> call() async {
+    return await repository.syncUsers();
+  }
+}