feat: select school terms and smooth refractive Dock motion

mobile/lib/features/profile/import_preview.dart

@@ -41,6 +41,14 @@ class _ImportPreviewState extends State<ImportPreview> {
               style: const TextStyle(color: river),
             ),
             if (draft.semesterLabel != null) Text('学期：${draft.semesterLabel}'),
+            if (draft.schoolTerm != null)
+              const Padding(
+                padding: EdgeInsets.only(top: 8),
+                child: Text(
+                  '文件仅包含这个学期；查询其他学期请使用学校连接中的“更新学期”。',
+                  style: TextStyle(fontSize: 12, height: 1.6),
+                ),
+              ),
             const SizedBox(height: 18),
             if (empty)
               Text(draft.explicitlyEmpty ? '此操作会清空当前课表。' : '没有识别到课程，当前课表保持不变。'),

mobile/lib/features/profile/profile_page.dart

@@ -18,10 +18,12 @@ class ProfilePage extends StatelessWidget {
     this.authStatus = '未登录',
     this.onLogout,
     this.logoutLabel = '退出学校登录',
+    this.onUpdateTerm,
   });
   final AppController controller;
   final VoidCallback onLogin;
   final VoidCallback? onLogout;
+  final VoidCallback? onUpdateTerm;
   final String authStatus, logoutLabel;
   Future<void> _import(BuildContext context) async {
     try {
@@ -190,6 +192,13 @@ class ProfilePage extends StatelessWidget {
                 ),
               ),
               Divider(height: 1, color: ink.withValues(alpha: 0.06)),
+              _tile(
+                Icons.date_range_rounded,
+                '更新学期',
+                controller.snapshot.schoolTerm?.label ?? '选择学校查询学期',
+                onUpdateTerm ?? onLogin,
+              ),
+              Divider(height: 1, color: ink.withValues(alpha: 0.06)),
               _tile(
                 Icons.file_download_outlined,
                 '从文件导入',

mobile/lib/features/profile/settings_page.dart

@@ -8,8 +8,13 @@ import '../../domain/semester.dart';
 import '../../services/notification_service.dart';
 
 class SettingsPage extends StatefulWidget {
-  const SettingsPage({super.key, required this.controller});
+  const SettingsPage({
+    super.key,
+    required this.controller,
+    this.focusSemester = false,
+  });
   final AppController controller;
+  final bool focusSemester;
   @override
   State<SettingsPage> createState() => _SettingsPageState();
 }
@@ -20,6 +25,7 @@ class _SettingsPageState extends State<SettingsPage> {
   double? _courseHeightDraft;
   bool _savingHeight = false;
   String? _weeksError, _dateError;
+  final _scroll = ScrollController();
   @override
   void initState() {
     super.initState();
@@ -27,11 +33,19 @@ class _SettingsPageState extends State<SettingsPage> {
     _weeks = TextEditingController(
       text: '${widget.controller.snapshot.settings.semester?.totalWeeks ?? 20}',
     );
+    if (widget.focusSemester) {
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        if (mounted && _scroll.hasClients) {
+          _scroll.jumpTo(_scroll.position.maxScrollExtent);
+        }
+      });
+    }
   }
 
   @override
   void dispose() {
     _weeks.dispose();
+    _scroll.dispose();
     super.dispose();
   }
 
@@ -132,6 +146,7 @@ class _SettingsPageState extends State<SettingsPage> {
           ),
         ),
         body: ListView(
+          controller: _scroll,
           padding: const EdgeInsets.fromLTRB(20, 12, 20, 40),
           children: [
             if (c.isDemo)