접근 제한 UX 구현

userfront/test/error_screen_test.dart

@@ -9,6 +9,7 @@ Future<void> _pumpErrorScreen(
   String? errorCode,
   String? description,
   bool? isProdOverride,
+  Future<Map<String, dynamic>> Function()? sessionProfileLoader,
 }) async {
   await tester.pumpWidget(
     MaterialApp(
@@ -16,6 +17,7 @@ Future<void> _pumpErrorScreen(
         errorCode: errorCode,
         description: description,
         isProdOverride: isProdOverride,
+        sessionProfileLoader: sessionProfileLoader,
       ),
     ),
   );
@@ -193,4 +195,50 @@ void main() {
     expect(find.text(type), findsOneWidget);
     expect(find.text('원문 메시지'), findsNothing);
   });
+
+  testWidgets('tenant_not_allowed는 전용 차단 정보를 노출한다', (
+    WidgetTester tester,
+  ) async {
+    await _pumpErrorScreen(
+      tester,
+      errorCode: 'tenant_not_allowed',
+      description: '원문 메시지',
+      isProdOverride: true,
+      sessionProfileLoader: () async {
+        return {
+          'email': 'employee@example.com',
+          'tenant': {'name': 'Baron HQ', 'slug': 'baron-hq'},
+        };
+      },
+    );
+
+    final title = tr(
+      'msg.userfront.error.title',
+      fallback: '인증 과정에서 오류가 발생했습니다',
+    );
+    final detail = tr(
+      'msg.userfront.error.tenant.detail',
+      fallback: '현재 로그인된 계정은 이 애플리케이션에 접근할 수 없습니다.',
+    );
+    final account = tr(
+      'msg.userfront.error.tenant.account',
+      fallback: '계정',
+    );
+    final tenant = tr(
+      'msg.userfront.error.tenant.tenant',
+      fallback: '소속 테넌트',
+    );
+    final switchAccount = tr(
+      'ui.userfront.error.switch_account',
+      fallback: '다른 계정으로 로그인',
+    );
+
+    expect(find.text(title), findsOneWidget);
+    expect(find.text(detail), findsOneWidget);
+    expect(find.text(account), findsOneWidget);
+    expect(find.text('employee@example.com'), findsOneWidget);
+    expect(find.text(tenant), findsOneWidget);
+    expect(find.text('Baron HQ'), findsOneWidget);
+    expect(find.text(switchAccount), findsOneWidget);
+  });
 }