mod: 页面样式调整&组件拆分

lib/pages/video/detail/reply/widgets/reply_item.dart

@@ -231,10 +231,10 @@ class ReplyItem extends StatelessWidget {
           ),
         Text(
           Utils.dateFormat(replyItem!.ctime),
-          style: Theme.of(context)
-              .textTheme
-              .labelMedium!
-              .copyWith(color: Theme.of(context).colorScheme.outline),
+          style: TextStyle(
+            fontSize: Theme.of(context).textTheme.labelMedium!.fontSize,
+            color: Theme.of(context).colorScheme.outline,
+          ),
         ),
         if (replyItem!.replyControl != null &&
             replyItem!.replyControl!.location != '')

lib/pages/video/detail/view.dart

@@ -248,8 +248,10 @@ class _VideoDetailPageState extends State<VideoDetailPage>
                 body: Column(
                   children: [
                     Container(
+                      width: double.infinity,
                       height: 45,
                       decoration: BoxDecoration(
+                        color: Theme.of(context).colorScheme.background,
                         border: Border(
                           bottom: BorderSide(
                             color: