feat: integrate undergraduate school workflows and period twelve

mobile/lib/features/timetable/timetable_page.dart

@@ -3,6 +3,7 @@ import 'package:flutter/material.dart';
 import '../../app/app_controller.dart';
 import '../../app/app_theme.dart';
 import '../../domain/schedule_engine.dart';
+import '../../domain/school_identity.dart';
 import '../../widgets/directional_week_transition.dart';
 import '../profile/settings_page.dart';
 import 'week_grid.dart';
@@ -84,13 +85,24 @@ class _TimetablePageState extends State<TimetablePage> {
             Padding(
               padding: const EdgeInsets.fromLTRB(14, 0, 14, 8),
               child: Text(
-                c.snapshot.schoolTerm!.label,
+                '${c.snapshot.schoolTerm!.school.label} · ${c.snapshot.schoolTerm!.label}',
                 style: TextStyle(
                   fontSize: 12,
                   color: ink.withValues(alpha: 0.5),
                 ),
               ),
             ),
+          if (!c.isDemo &&
+              c.snapshot.schoolTerm != null &&
+              c.snapshot.selectedSchool != null &&
+              c.snapshot.selectedSchool != c.snapshot.schoolTerm!.school)
+            Padding(
+              padding: const EdgeInsets.fromLTRB(14, 0, 14, 8),
+              child: Text(
+                '当前仍为${c.snapshot.schoolTerm!.school.label}课表；新课表导入成功后才会替换。',
+                style: const TextStyle(fontSize: 12, color: river),
+              ),
+            ),
           const SizedBox(height: 10),
           SurfaceCard(
             padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 0),
@@ -182,6 +194,12 @@ class _TimetablePageState extends State<TimetablePage> {
                 monday: monday,
                 today: today,
                 settings: c.visibleSettings,
+                periodCount:
+                    !c.isDemo &&
+                        c.snapshot.schoolTerm?.school ==
+                            SupportedSchool.uestcUndergraduate
+                    ? 12
+                    : 11,
               ),
             ),
             const SizedBox(height: 12),