feat: select school before connecting timetable

mobile/lib/features/profile/profile_page.dart

@@ -18,6 +18,7 @@ class ProfilePage extends StatelessWidget {
     super.key,
     required this.controller,
     required this.onLogin,
+    this.schoolName,
     this.authStatus = '未登录',
     this.onLogout,
     this.logoutLabel = '退出学校登录',
@@ -26,6 +27,7 @@ class ProfilePage extends StatelessWidget {
   });
   final AppController controller;
   final VoidCallback onLogin;
+  final String? schoolName;
   final VoidCallback? onLogout;
   final VoidCallback? onUpdateTerm;
   final String authStatus, logoutLabel;
@@ -98,12 +100,12 @@ class ProfilePage extends StatelessWidget {
               ),
               const SizedBox(height: 16),
               const Text(
-                '连接学校课表',
+                '学校课表',
                 style: TextStyle(fontSize: 20, fontWeight: FontWeight.w700),
               ),
               const SizedBox(height: 7),
               Text(
-                '电子科技大学 · 研究生\n$authStatus',
+                '${schoolName ?? '选择学校后连接教务系统'}\n$authStatus',
                 style: TextStyle(
                   fontSize: 12,
                   height: 1.8,
@@ -115,7 +117,7 @@ class ProfilePage extends StatelessWidget {
                 width: double.infinity,
                 child: FilledButton(
                   onPressed: onLogin,
-                  child: Text(onLogout == null ? '登录学校账户' : '打开学校课表'),
+                  child: const Text('选择学校'),
                 ),
               ),
               if (onLogout != null)