fix(auth): improve resendCode with status tracking and return value

apps/lib/features/auth/presentation/cubits/register_cubit.dart

@@ -152,17 +152,28 @@ class RegisterCubit extends Cubit<RegisterState> {
     }
   }
 
-  Future<void> resendCode() async {
+  Future<bool> resendCode() async {
-    if (state.pendingEmail == null) return;
+    if (state.pendingEmail == null) return false;
+
+    emit(state.copyWith(status: FormzSubmissionStatus.inProgress));
 
     try {
       await _repository.signupResend(
         SignupResendRequest(email: state.pendingEmail!),
       );
-      emit(state.copyWith(codeSent: true));
+      emit(
+        state.copyWith(status: FormzSubmissionStatus.success, codeSent: true),
+      );
+      return true;
     } catch (e) {
-      final message = e is ApiException ? e.message : e.toString();
+      final message = e is ApiException ? e.message : '验证码发送失败，请重试';
-      emit(state.copyWith(errorMessage: message));
+      emit(
+        state.copyWith(
+          status: FormzSubmissionStatus.failure,
+          errorMessage: message,
+        ),
+      );
+      return false;
     }
   }
 

apps/lib/features/auth/ui/screens/register_verification_screen.dart

@@ -94,9 +94,9 @@ class _RegisterVerificationViewState extends State<RegisterVerificationView> {
 
   Future<void> _handleResendCode() async {
     final cubit = context.read<RegisterCubit>();
-    await cubit.resendCode();
+    final success = await cubit.resendCode();
 
-    if (cubit.state.codeSent && mounted) {
+    if (success && mounted) {
       _startCountdown();
     }
   }

apps/test/features/auth/presentation/cubits/register_cubit_test.dart

@@ -21,6 +21,7 @@ void main() {
     registerFallbackValue(
       SignupStartRequest(username: '', email: '', password: ''),
     );
+    registerFallbackValue(SignupResendRequest(email: ''));
   });
 
   tearDown(() {
@@ -145,4 +146,61 @@ void main() {
       },
     );
   });
+
+  group('resendCode', () {
+    blocTest<RegisterCubit, RegisterState>(
+      'returns true and sets status on success',
+      build: () => cubit,
+      seed: () => RegisterState(pendingEmail: 'test@example.com'),
+      setUp: () {
+        when(() => mockRepository.signupResend(any())).thenAnswer(
+          (_) async => SignupStartResponse(
+            status: 'ok',
+            email: 'test@example.com',
+            message: 'Code sent',
+          ),
+        );
+      },
+      act: (c) => c.resendCode(),
+      expect: () => [
+        isA<RegisterState>().having(
+          (s) => s.status,
+          'status',
+          FormzSubmissionStatus.inProgress,
+        ),
+        isA<RegisterState>().having(
+          (s) => s.status,
+          'status',
+          FormzSubmissionStatus.success,
+        ),
+      ],
+      verify: (_) {
+        verify(() => mockRepository.signupResend(any())).called(1);
+      },
+    );
+
+    blocTest<RegisterCubit, RegisterState>(
+      'returns false on error',
+      build: () => cubit,
+      seed: () => RegisterState(pendingEmail: 'test@example.com'),
+      setUp: () {
+        when(
+          () => mockRepository.signupResend(any()),
+        ).thenThrow(ServerException('Network error'));
+      },
+      act: (c) => c.resendCode(),
+      expect: () => [
+        isA<RegisterState>().having(
+          (s) => s.status,
+          'status',
+          FormzSubmissionStatus.inProgress,
+        ),
+        isA<RegisterState>().having(
+          (s) => s.status,
+          'status',
+          FormzSubmissionStatus.failure,
+        ),
+      ],
+    );
+  });
 }