fix: import unpublished exam rooms and add opt-in school HTML feedback

mobile/test/school/undergraduate_exam_adapter_test.dart

@@ -12,6 +12,29 @@ void main() {
   String fixture() =>
       File('test/fixtures/school/undergraduate-exams.html').readAsStringSync();
   final term = SchoolTerm(503, school: SupportedSchool.uestcUndergraduate);
+  test('unpublished room and seat merged by school keep the dated exam', () {
+    final page = fixture().replaceFirst(
+      RegExp(r'<td>示例考场</td>\s*<td>1</td>'),
+      '<td colspan="2">[考试情况尚未发布]</td>',
+    );
+    expect(page, contains('colspan="2"'));
+    final result = UndergraduateExamAdapter.extract(page);
+    expect(result.records, hasLength(4));
+    final record = result.records.first;
+    expect(record.date, '2026-06-22');
+    expect(record.time, contains('14:00-16:00'));
+    expect(record.room, '[考试情况尚未发布]');
+    expect(record.seat, '');
+    expect(record.status, '正常');
+    expect(record.examTypeId, 1);
+  });
+  test('unexpected merged exam columns remain a failed import', () {
+    final page = fixture().replaceFirst(
+      '<td>示例考场</td>',
+      '<td colspan="3">[考试情况尚未发布]</td>',
+    );
+    expect(() => UndergraduateExamAdapter.extract(page), throwsFormatException);
+  });
   test('actual exam result term wins over the outer default', () {
     final schedule = UndergraduateExamAdapter.extract(fixture());
     expect(schedule.termId, '503');
@@ -68,17 +91,7 @@ void main() {
   );
   test('only recognized explicit empty exam tables are empty success', () {
     final empty =
-        '<form id="stdExamTableForm"><input name="semester.id" value="503"><input name="examType.id" value="1"></form><table><tr>${[
-          '课程序号',
-          '课程名称',
-          '考试日期',
-          '考试安排',
-          '考试地点',
-          '座位号',
-          '考试情况',
-          '考试类型',
-          '其它说明',
-        ].map((s) => '<td>$s</td>').join()}</tr><tr><td colspan="9">暂无考试安排</td></tr></table>';
+        '<form id="stdExamTableForm"><input name="semester.id" value="503"><input name="examType.id" value="1"></form><table><tr>${['课程序号', '课程名称', '考试日期', '考试安排', '考试地点', '座位号', '考试情况', '考试类型', '其它说明'].map((s) => '<td>$s</td>').join()}</tr><tr><td colspan="9">暂无考试安排</td></tr></table>';
     expect(UndergraduateExamAdapter.extract(empty).records, isEmpty);
     expect(
       () => UndergraduateExamAdapter.extract(empty.replaceAll('暂无考试安排', '')),

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();
   });
 }

mobile/test/school/undergraduate_session_test.dart

@@ -6,6 +6,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:webview_flutter_platform_interface/webview_flutter_platform_interface.dart';
 import 'package:hepan_everyday/features/school/undergraduate/session.dart';
 import 'package:hepan_everyday/features/school/undergraduate/page_probe.dart';
+import 'package:hepan_everyday/services/school_page_diagnostic.dart';
 
 import '../support/fake_school_web.dart';
 
@@ -31,6 +32,21 @@ void main() {
     session = UndergraduateSession();
   });
   tearDown(() => session.dispose());
+  test('failed import retains diagnostic evidence separately and logout removes it', () async {
+    addTearDown(SchoolPageDiagnostic.instance.clear);
+    await session.openTimetable();
+    final content = File('test/fixtures/school/undergraduate-timetable.html')
+        .readAsStringSync()
+        .replaceFirst('"教师1"', '""');
+    platform.web.javascript = (_) async =>
+        underEvidence(platform.web.url!, html: content);
+    await session.readCurrentTimetable();
+    expect(session.pendingDraft, isNull);
+    expect(session.message, contains('教师'));
+    expect(SchoolPageDiagnostic.instance.export(), isNotNull);
+    session.invalidateAuthentication();
+    expect(SchoolPageDiagnostic.instance.export(), isNull);
+  });
   test('live URL cannot cross origin or change again during capture', () async {
     await session.openTimetable();
     final content = File('test/fixtures/school/undergraduate-timetable.html')

mobile/test/school/undergraduate_timetable_adapter_test.dart

@@ -9,6 +9,27 @@ import 'package:hepan_everyday/data/schedule_file_import.dart';
 import 'package:hepan_everyday/domain/school_identity.dart';
 
 void main() {
+  test('missing course fields identify the failing field without disclosing values', () {
+    const base =
+        'new TaskActivity("T", "教师", "C", "课程(C.01)", "R", "教室", "010"); '
+        'index=0*unitCount+0;table0.activities[index][table0.activities[index].length]=activity;';
+    for (final entry in {
+      'teacher_missing': base.replaceFirst('"教师"', '""'),
+      'room_missing': base.replaceFirst('"教室"', '""'),
+      'course_sequence_invalid': base.replaceFirst('课程(C.01)', '课程'),
+    }.entries) {
+      expect(
+        () => parseActivityData(entry.value, unitCount: 12),
+        throwsA(
+          isA<UndergraduateActivityException>().having(
+            (e) => e.code,
+            'reason',
+            entry.key,
+          ),
+        ),
+      );
+    }
+  });
   test('unrecognized activity writes and incomplete declarations reject the entire timetable', () {
     const valid =
         'activity = new TaskActivity("T", "教师", "C", "课程(C.01)", "R", "教室", "010"); '