fix(auth): 登录异常改为居中吐司

test/auth/phone_auth_sheet_test.dart

@@ -98,10 +98,10 @@ void main() {
 
     expect(find.text('Enter a valid phone number'), findsOneWidget);
     expect(adapter.requests, isEmpty);
-    expect(find.byKey(const Key('centered-error-dialog')), findsNothing);
+    expect(find.byKey(const Key('centered-toast')), findsNothing);
   });
 
-  testWidgets('should_show_centered_dialog_when_otp_request_fails', (
+  testWidgets('should_show_centered_toast_when_otp_request_fails', (
     tester,
   ) async {
     final api = _FailingPhoneAuthApi(sendOtpMessage: 'Too many OTP requests');
@@ -117,9 +117,9 @@ void main() {
     await tester.tap(find.byKey(const Key('auth-send-code')));
     await tester.pumpAndSettle();
 
-    expect(find.byKey(const Key('centered-error-dialog')), findsOneWidget);
-    expect(find.text('Login failed'), findsOneWidget);
+    expect(find.byKey(const Key('centered-toast')), findsOneWidget);
     expect(find.text('Too many OTP requests'), findsOneWidget);
+    expect(find.byType(AlertDialog), findsNothing);
     expect(api.sendOtpCalls, 1);
     expect(
       tester
@@ -127,9 +127,12 @@ void main() {
           .onPressed,
       isNotNull,
     );
+
+    await _pumpToastAway(tester);
+    expect(find.byKey(const Key('centered-toast')), findsNothing);
   });
 
-  testWidgets('should_show_centered_dialog_when_phone_login_fails', (
+  testWidgets('should_show_centered_toast_when_phone_login_fails', (
     tester,
   ) async {
     final api = _FailingPhoneAuthApi(loginMessage: 'Invalid verification code');
@@ -146,9 +149,9 @@ void main() {
     await tester.tap(find.byKey(const Key('auth-phone-submit')));
     await tester.pumpAndSettle();
 
-    expect(find.byKey(const Key('centered-error-dialog')), findsOneWidget);
-    expect(find.text('Login failed'), findsOneWidget);
+    expect(find.byKey(const Key('centered-toast')), findsOneWidget);
     expect(find.text('Invalid verification code'), findsOneWidget);
+    expect(find.byType(AlertDialog), findsNothing);
     expect(api.loginWithPhoneCalls, 1);
     expect(
       tester
@@ -156,6 +159,9 @@ void main() {
           .onPressed,
       isNotNull,
     );
+
+    await _pumpToastAway(tester);
+    expect(find.byKey(const Key('centered-toast')), findsNothing);
   });
 
   testWidgets('should_keep_code_above_ios_keyboard', (tester) async {
@@ -191,6 +197,11 @@ void main() {
   });
 }
 
+Future<void> _pumpToastAway(WidgetTester tester) async {
+  await tester.pump(const Duration(seconds: 3));
+  await tester.pumpAndSettle();
+}
+
 class _FailingPhoneAuthApi extends AuthApi {
   _FailingPhoneAuthApi({
     this.sendOtpMessage = 'otp failed',