fix: import unpublished exam rooms and add opt-in school HTML feedback

mobile/lib/features/school/undergraduate/session.dart

@@ -8,6 +8,8 @@ import '../../../data/json_schedule_import.dart';
 import '../../../domain/exam_schedule.dart';
 import '../../../domain/undergraduate_exam_query.dart';
 import '../../../services/diagnostic_log.dart';
+import '../../../services/school_page_diagnostic.dart';
+import 'activity_data.dart';
 import 'navigation_policy.dart';
 import 'page_probe.dart';
 import 'timetable_adapter.dart';
@@ -206,6 +208,7 @@ class UndergraduateSession extends ChangeNotifier {
       ),
     );
   Future<void> openTimetable() async {
+    SchoolPageDiagnostic.instance.clear();
     DiagnosticLog.instance.add(
       'login_opened',
       fields: {'school': 'undergraduate', 'phase': 'timetable'},
@@ -222,6 +225,7 @@ class UndergraduateSession extends ChangeNotifier {
   }
 
   Future<void> openExams(UndergraduateExamQuery value) async {
+    SchoolPageDiagnostic.instance.clear();
     DiagnosticLog.instance.add(
       'login_opened',
       fields: {
@@ -434,6 +438,10 @@ class UndergraduateSession extends ChangeNotifier {
         return;
       }
       if (pages.length != 1) throw const FormatException('排考结果页面不明确');
+      SchoolPageDiagnostic.instance.remember(
+        pages.single.html,
+        pages.single.url,
+      );
       final part = UndergraduateExamAdapter.extract(
         pages.single.html,
         expectedTerm: query!.term,
@@ -519,6 +527,10 @@ class UndergraduateSession extends ChangeNotifier {
       if (pages.length != 1) {
         throw const FormatException('请先在学校网页打开完整课表，再点击导入。');
       }
+      SchoolPageDiagnostic.instance.remember(
+        pages.single.html,
+        pages.single.url,
+      );
       final draft = UndergraduateTimetableAdapter.extract(
         pages.single.html,
         pages.single.url,
@@ -531,6 +543,18 @@ class UndergraduateSession extends ChangeNotifier {
       _emit();
     } catch (error) {
       if (_valid(g) && d == _document) {
+        DiagnosticLog.instance.add(
+          'school_read_failed',
+          fields: {
+            'school': 'undergraduate',
+            'phase': 'timetable',
+            'code': error is UndergraduateActivityException
+                ? error.code
+                : error.runtimeType.toString(),
+            if (error is UndergraduateActivityException)
+              'count': error.activityNumber,
+          },
+        );
         message = '导入未完成：$error';
         _emit();
       }
@@ -554,6 +578,7 @@ class UndergraduateSession extends ChangeNotifier {
   }
 
   Future<void> reauthenticate() async {
+    SchoolPageDiagnostic.instance.clear();
     await _logoutFuture;
     if (_disposed) return;
     _reset();
@@ -566,6 +591,7 @@ class UndergraduateSession extends ChangeNotifier {
   }
 
   void invalidateAuthentication() {
+    SchoolPageDiagnostic.instance.clear();
     _reset();
     _active = false;
     hasOpened = false;
@@ -601,6 +627,7 @@ class UndergraduateSession extends ChangeNotifier {
 
   @override
   void dispose() {
+    SchoolPageDiagnostic.instance.clear();
     _disposed = true;
     _active = false;
     _generation++;