feat(player): 新增卡片式播放器

lib/pages/player/player_logic.dart

@@ -531,6 +531,18 @@ class PlayerLogic extends ChangeNotifier {
         : null;
   }
 
+  bool get hasNextEpisode => nextVisibleIndex(session.currentIndex) != null;
+
+  Future<void> playNextEpisode() async {
+    final next = nextVisibleIndex(session.currentIndex);
+    if (next == null || !pages.hasClients) return;
+    await pages.animateToPage(
+      visibleIndices.indexOf(next),
+      duration: const Duration(milliseconds: 250),
+      curve: Curves.easeOutCubic,
+    );
+  }
+
   void beginScrub(VideoPlayerPort player) {
     if (session.active != player) return;
     scrubbingPlayer = player;