Preserve courses with pending rooms and report precise graduate import errors

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

@@ -54,13 +54,6 @@ List<UndergraduateActivity> parseActivityData(
         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) ||
         bitmap.length > 64 ||
@@ -109,7 +102,7 @@ List<UndergraduateActivity> parseActivityData(
         args[1].trim(),
         args[3].substring(0, suffix.start).trim(),
         suffix[1]!,
-        args[5].trim(),
+        args[5].trim().isEmpty ? '教室待定' : args[5].trim(),
         indices,
         weeks,
       ),

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

@@ -103,7 +103,13 @@ class _UndergraduateAuthPageState extends State<UndergraduateAuthPage> {
         if (route?.isCurrent == true) Navigator.pop(context);
         messenger.showSnackBar(
           SnackBar(
-            content: Text(exams == null ? '课表已导入，请核对学期开始日。' : '考试信息已更新'),
+            content: Text(
+              exams != null
+                  ? '考试信息已更新'
+                  : draft!.courses.any((c) => c.room == '教室待定')
+                  ? '课表已导入，部分课程教室待定；请核对学期开始日。'
+                  : '课表已导入，请核对学期开始日。',
+            ),
           ),
         );
       } else if (controller.lastError != null) {

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

@@ -28,7 +28,8 @@ class UndergraduateTimetableAdapter {
           table = html
               .parse(content)
               .querySelector('#manualArrangeCourseTable');
-      if (table == null || doc.querySelector('input[type="password"]') != null) {
+      if (table == null ||
+          doc.querySelector('input[type="password"]') != null) {
         throw const FormatException('请先在学校网页打开课表');
       }
       final termIds = doc
@@ -161,7 +162,10 @@ class UndergraduateTimetableAdapter {
               weeks: group.weeks,
               source: source,
               courseCode: info?.code ?? a.courseCode,
-              notes: info?.notes ?? '',
+              notes: [
+                if (info?.notes.isNotEmpty == true) info!.notes,
+                if (a.room == '教室待定') '学校未提供教室，请以学校最新安排为准并在公布后刷新课表。',
+              ].join('\n'),
             ),
           );
         }