mod: use DraggableScrollableSheet

lib/pages/video/detail/introduction/widgets/group_panel.dart

@@ -59,10 +59,19 @@ class _GroupPanelState extends State<GroupPanel> {
         AppBar(
           centerTitle: false,
           elevation: 0,
+          shape: const RoundedRectangleBorder(
+            borderRadius: BorderRadius.vertical(
+              top: Radius.circular(20),
+            ),
+          ),
           leading: IconButton(
               onPressed: () => Get.back(),
               icon: const Icon(Icons.close_outlined)),
-          title: Text('设置关注分组', style: Theme.of(context).textTheme.titleMedium),
+          title: Text('设置关注分组',
+              style: Theme.of(context)
+                  .textTheme
+                  .titleMedium!
+                  .copyWith(fontWeight: FontWeight.bold)),
         ),
         Expanded(
           child: Material(
@@ -115,7 +124,7 @@ class _GroupPanelState extends State<GroupPanel> {
                   }
                 } else {
                   // 骨架屏
-                  return const Text('请求中');
+                  return const Center(child: Text('请求中'));
                 }
               },
             ),