fix: import unpublished exam rooms and add opt-in school HTML feedback

mobile/test/school/undergraduate_exam_batch_test.dart

@@ -7,6 +7,7 @@ import 'package:hepan_everyday/features/school/undergraduate/page_probe.dart';
 import 'package:hepan_everyday/domain/school_term.dart';
 import 'package:hepan_everyday/domain/school_identity.dart';
 import 'package:hepan_everyday/domain/undergraduate_exam_query.dart';
+import 'package:hepan_everyday/services/school_page_diagnostic.dart';
 
 import '../support/fake_school_web.dart';
 import 'undergraduate_session_test.dart' show underEvidence;
@@ -123,6 +124,7 @@ void main() {
     await finish();
     await tester.pump(const Duration(seconds: 46));
     expect(session.message, contains('超时'));
+    SchoolPageDiagnostic.instance.clear();
     expect(session.pendingExams, isNull);
   });
   test('cancelled batch ignores late page callbacks', () async {
@@ -199,5 +201,6 @@ void main() {
     await tester.pump(const Duration(seconds: 41));
     expect(session.pendingExams, isNull);
     expect(session.message, contains('超时'));
+    SchoolPageDiagnostic.instance.clear();
   });
 }