fix: import unpublished exam rooms and add opt-in school HTML feedback

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

@@ -1,3 +1,13 @@
+class UndergraduateActivityException extends FormatException {
+  const UndergraduateActivityException(
+    this.code,
+    String message,
+    this.activityNumber,
+  ) : super(message);
+  final String code;
+  final int activityNumber;
+}
+
 class UndergraduateActivity {
   UndergraduateActivity(
     this.teacher,
@@ -30,8 +40,26 @@ List<UndergraduateActivity> parseActivityData(
     final m = matches[i], args = _strings(m[1]!);
     if (args.length != 7) throw const FormatException('课程活动字段不完整');
     final suffix = RegExp(r'\(([A-Za-z0-9_.-]+)\)$').firstMatch(args[3]);
-    if (suffix == null || args[1].trim().isEmpty || args[5].trim().isEmpty) {
-      throw const FormatException('教师、教室或课程序号缺失');
+    if (suffix == null) {
+      throw UndergraduateActivityException(
+        'course_sequence_invalid',
+        '课程序号格式无法识别，请附带网页反馈',
+        i + 1,
+      );
+    }
+    if (args[1].trim().isEmpty) {
+      throw UndergraduateActivityException(
+        'teacher_missing',
+        '课程活动未提供教师信息，请附带网页反馈',
+        i + 1,
+      );
+    }
+    if (args[5].trim().isEmpty) {
+      throw UndergraduateActivityException(
+        'room_missing',
+        '课程活动未提供教室信息，请附带网页反馈',
+        i + 1,
+      );
     }
     final bitmap = args[6];
     if (!RegExp(r'^0[01]+$').hasMatch(bitmap) ||

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

@@ -102,11 +102,26 @@ class UndergraduateExamAdapter {
       final explicitEmpty = RegExp(r'暂无考试|无考试安排|没有考试|暂无记录|没有符合条件的记录|没有数据|无数据')
           .hasMatch(table.text);
       for (final row in table.querySelectorAll('tr').skip(1)) {
-        final cells = row.children
-            .map((c) => c.text.replaceAll(RegExp(r'\s+'), ' ').trim())
-            .toList();
+        if (explicitEmpty && row.children.length == 1) continue;
+        final cells = <String>[];
+        for (final cell in row.children) {
+          final value = cell.text.replaceAll(RegExp(r'\s+'), ' ').trim();
+          final span = int.tryParse(cell.attributes['colspan'] ?? '1');
+          if ((cell.attributes['rowspan'] ?? '1') != '1') {
+            throw const FormatException('考试记录行合并结构无法识别');
+          }
+          if (span == 1) {
+            cells.add(value);
+          } else if (span == 2 &&
+              cells.length == 4 &&
+              RegExp(r'^[\[【]?考试情况尚未发布[\]】]?$').hasMatch(value)) {
+            // EAMS merges the room and seat columns until it publishes them.
+            cells.addAll([value, '']);
+          } else {
+            throw const FormatException('考试记录列合并结构无法识别');
+          }
+        }
         if (cells.length != 9) {
-          if (explicitEmpty && cells.length == 1) continue;
           throw const FormatException('考试记录字段不完整');
         }
         final rowType = _type(cells[7]);

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++;