feat(flutter): 统一空列表占位组件

lib/pages/player/widgets/drama_comments_sheet.dart

@@ -14,6 +14,7 @@ import '../../../core/formatting/error_text.dart';
 import '../../../core/platform/haptics.dart';
 import '../../../core/theme/app_colors.dart';
 import '../../../core/widgets/auth_gate.dart';
+import '../../../core/widgets/empty_state.dart';
 import '../../../l10n/app_localizations.dart';
 import '../../interaction/widgets/report_dialog.dart';
 import 'comment_tile.dart';
@@ -219,12 +220,11 @@ class _DramaCommentsSheetState extends State<DramaCommentsSheet> {
       );
     }
     if (_controller.comments.isEmpty) {
-      return Center(
+      return EmptyState(
         key: const Key('comment-list-empty'),
-        child: Text(
-          l10n.noComments,
-          style: const TextStyle(color: AppColors.muted),
-        ),
+        icon: Icons.chat_bubble_outline_rounded,
+        title: l10n.noComments,
+        compact: true,
       );
     }
     return ListView.builder(