fix(auth): set failure status on sendCodeSilently error

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

@@ -90,7 +90,7 @@ void main() {
     );
 
     blocTest<RegisterCubit, RegisterState>(
-      'restores isSending to false and sets errorMessage on error',
+      'restores isSending to false and sets errorMessage and failure status on error',
       build: () => cubit,
       seed: () => RegisterState(
         username: const Username.dirty('testuser'),
@@ -107,7 +107,9 @@ void main() {
         predicate<RegisterState>((state) => state.isSending == true),
         predicate<RegisterState>(
           (state) =>
-              state.isSending == false && state.errorMessage == 'Network error',
+              state.isSending == false &&
+              state.errorMessage == 'Network error' &&
+              state.status == FormzSubmissionStatus.failure,
         ),
       ],
       verify: (_) {
@@ -148,6 +150,21 @@ void main() {
   });
 
   group('resendCode', () {
+    blocTest<RegisterCubit, RegisterState>(
+      'returns false and sets failure status when pendingEmail is null',
+      build: () => cubit,
+      seed: () => RegisterState(pendingEmail: null),
+      act: (c) => c.resendCode(),
+      expect: () => [
+        isA<RegisterState>()
+            .having((s) => s.status, 'status', FormzSubmissionStatus.failure)
+            .having((s) => s.errorMessage, 'errorMessage', '验证码发送失败，请返回上一步重试'),
+      ],
+      verify: (_) {
+        verifyNever(() => mockRepository.signupResend(any()));
+      },
+    );
+
     blocTest<RegisterCubit, RegisterState>(
       'returns true and sets status on success',
       build: () => cubit,