refactor(tests): update profile_repository_test to include MockRef for improved testing

flutter/test/features/profile/data/profile_repository_test.dart

@@ -1,9 +1,14 @@
 import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:mockito/mockito.dart';
+import 'package:mockito/annotations.dart';
 import 'package:recipe_flutter/core/api/api_client.dart';
 import 'package:recipe_flutter/core/api/api_exception.dart';
 import 'package:recipe_flutter/features/profile/data/profile_repository.dart';
 
+@GenerateMocks([Ref])
+void main() {}
+
 class MockApiClient extends Mock implements ApiClient {}
 
 void main() {
@@ -13,7 +18,7 @@ void main() {
 
     setUp(() {
       mockApiClient = MockApiClient();
-      final mockRef = MockRef();
+      final mockRef = MockRef(); // Ensure MockRef is generated by Mockito
       profileRepository = ProfileRepository(mockApiClient, mockRef);
     });