feat(app): 完善播放协议搜索与空状态

lib/pages/player/widgets/drama_comments_sheet.dart

@@ -401,11 +401,12 @@ class _CommentPostSuccessOverlay extends StatelessWidget {
   Widget build(BuildContext context) {
     return Positioned.fill(
       child: IgnorePointer(
-        child: SafeArea(
-          child: Align(
-            alignment: const Alignment(0, 0.55),
-            child: Semantics(
-              liveRegion: true,
+        child: Align(
+          alignment: const Alignment(0, -0.4),
+          child: Semantics(
+            liveRegion: true,
+            child: Material(
+              type: MaterialType.transparency,
               child: Container(
                 key: const Key('comment-post-success-snackbar'),
                 padding: const EdgeInsets.symmetric(
@@ -422,6 +423,8 @@ class _CommentPostSuccessOverlay extends StatelessWidget {
                   style: const TextStyle(
                     color: AppColors.onPrimary,
                     fontSize: 14,
+                    decoration: TextDecoration.none,
+                    decorationColor: AppColors.transparent,
                   ),
                 ),
               ),