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

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,
+        ),
+      ],
+    );
+  });
 }