feat(flutter): 播放页互动数量与评论面板收紧

lib/pages/player/widgets/player_overlay_parts.dart

@@ -138,7 +138,9 @@ class _Rail extends StatelessWidget {
         _RailButton(
           key: const Key('player-rail-save'),
           icon: saved ? Icons.star_rounded : Icons.star_border_rounded,
-          label: favoriteCount?.toString() ?? l10n.favorite,
+          label: favoriteCount == null
+              ? l10n.favorite
+              : formatInteractionCount(favoriteCount!),
           active: saved,
           onTap: onSave,
         ),
@@ -146,14 +148,18 @@ class _Rail extends StatelessWidget {
         _RailButton(
           key: const Key('player-rail-comments'),
           icon: Icons.chat_bubble_outline_rounded,
-          label: commentCount?.toString() ?? l10n.comments,
+          label: commentCount == null
+              ? l10n.comments
+              : formatInteractionCount(commentCount!),
           onTap: onComments,
         ),
         const SizedBox(height: _railGap),
         _RailButton(
           key: const Key('player-rail-like'),
           icon: liked ? Icons.favorite_rounded : Icons.favorite_border_rounded,
-          label: likeCount?.toString() ?? l10n.like,
+          label: likeCount == null
+              ? l10n.like
+              : formatInteractionCount(likeCount!),
           active: liked,
           onTap: onLike,
         ),