fix(auth): set failure status on sendCodeSilently error

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

@@ -153,7 +153,15 @@ class RegisterCubit extends Cubit<RegisterState> {
   }
 
   Future<bool> resendCode() async {
-    if (state.pendingEmail == null) return false;
+    if (state.pendingEmail == null) {
+      emit(
+        state.copyWith(
+          status: FormzSubmissionStatus.failure,
+          errorMessage: '验证码发送失败，请返回上一步重试',
+        ),
+      );
+      return false;
+    }
 
     emit(state.copyWith(status: FormzSubmissionStatus.inProgress));
 
@@ -200,7 +208,13 @@ class RegisterCubit extends Cubit<RegisterState> {
       );
     } catch (e) {
       final message = e is ApiException ? e.message : '验证码发送失败，请重试';
-      emit(state.copyWith(isSending: false, errorMessage: message));
+      emit(
+        state.copyWith(
+          isSending: false,
+          status: FormzSubmissionStatus.failure,
+          errorMessage: message,
+        ),
+      );
     }
   }
 }