fix(player): 重构单层过渡并阻止锁定集串播

lib/pages/player/player_view.dart

@@ -146,9 +146,8 @@ class _PlayerPageState extends State<PlayerPage>
     _thumbnailService = PlaybackThumbnailService(
       sourceResolver: _resolveThumbnailSource,
     );
-    _spriteAxisService = SpriteThumbnailAxisService(
-      spriteCacheCapacity: 8,
-    )..addListener(_handleSpriteFrameChanged);
+    _spriteAxisService = SpriteThumbnailAxisService(spriteCacheCapacity: 8)
+      ..addListener(_handleSpriteFrameChanged);
     WidgetsBinding.instance.addObserver(this);
     logic.start(
       factory: context.read<PlayerFactory>(),
@@ -389,10 +388,9 @@ class _PlayerPageState extends State<PlayerPage>
         continue;
       }
       final thumbnailsUrl = logic.sessionEpisodes[index].thumbnailsUrl;
-      if (thumbnailsUrl != null) {
-        unawaited(
-          _spriteAxisService.prepareAt(thumbnailsUrl, Duration.zero),
-        );
+      if (thumbnailsUrl != null &&
+          !logic.isEpisodeLocked(logic.sessionEpisodes[index])) {
+        unawaited(_spriteAxisService.prepareAt(thumbnailsUrl, Duration.zero));
       }
     }
   }
@@ -603,33 +601,36 @@ class _PlayerPageState extends State<PlayerPage>
           )
         : displayed;
     final selected = index == logic.session.currentIndex;
+    final locked =
+        logic.isEpisodeLocked(episode) ||
+        logic.session.isLocked ||
+        logic.blockedEpisodeId == episode.id;
     // Selection changes before the prepared slot is promoted. Use its controller
     // throughout the handoff instead of briefly falling back to a placeholder.
-    final port =
-        (selected ? logic.session.active : null) ??
-        logic.session.preparedPlayerAt(index);
+    final port = locked
+        ? null
+        : (selected ? logic.session.active : null) ??
+              logic.session.preparedPlayerAt(index);
     final videoPort = port is VideoPlayerPort ? port : null;
-    final handoff = selected ? logic.session.handoffAt(index) : null;
+    final handoff = selected && !locked ? logic.session.handoffAt(index) : null;
     final handoffPort = handoff is VideoPlayerPort ? handoff : null;
     // 测试播放器没有纹理。有播放器但不是视频控制器时视为已就绪，避免加载圈一直转。
     final videoReady = videoPort?.controller.value.isInitialized ?? false;
     if (selected && videoReady) _logSwipeReveal();
-    final ready = videoReady || port != null;
+    final ready = !locked && (videoReady || port != null);
     final theater = logic.pip || logic.pipPreparing;
     final videoFit = theater ? BoxFit.contain : BoxFit.cover;
     final preparedFrameAvailable =
-        selected && logic.session.reusedWarmAt(index);
+        selected && !locked && logic.session.reusedWarmAt(index);
     final thumbnailsUrl = episode.thumbnailsUrl;
     final openingFrameReady =
         thumbnailsUrl != null &&
         _spriteAxisService.cachedFrameAt(thumbnailsUrl, Duration.zero) != null;
     if (thumbnailsUrl != null) {
-      unawaited(
-        _spriteAxisService.prepareAt(thumbnailsUrl, Duration.zero),
-      );
+      unawaited(_spriteAxisService.prepareAt(thumbnailsUrl, Duration.zero));
     }
-    final locked = logic.session.isLocked || episode.locked;
     if (selected &&
+        !locked &&
         videoPort != null &&
         videoPort.controller.value.isInitialized) {
       unawaited(
@@ -649,20 +650,27 @@ class _PlayerPageState extends State<PlayerPage>
             color: AppColors.mediaBlack,
           ),
         PlayerVideoSurface(
-          controller: videoPort?.controller,
-          handoff: handoffPort?.controller,
+          controller: locked ? null : videoPort?.controller,
           videoUrl: videoPort?.controller.dataSource ?? episode.videoUrl,
           theater: theater,
-          holdOpeningUntilFirstFrame: logic.session.userWantsPlay,
-          preparedFrameAvailable: preparedFrameAvailable,
-          openingFrameReady: openingFrameReady,
-          openingFrame: playerOpeningFrame(
-            thumbnailsUrl,
-            spriteSource: _spriteAxisService,
-            fit: videoFit,
-          ),
+          warmFrameAvailable: preparedFrameAvailable,
+          thumbnailReady: openingFrameReady,
+          waitForPlaybackFrame: logic.session.userWantsPlay,
+          placeholder: locked
+              ? null
+              : handoffPort != null
+              ? ControllerFramePlaceholder(
+                  controller: handoffPort.controller,
+                  theater: theater,
+                )
+              : playerOpeningFrame(
+                  thumbnailsUrl,
+                  spriteSource: _spriteAxisService,
+                  fit: videoFit,
+                ),
         ),
         if (selected &&
+            !locked &&
             !theater &&
             !ready &&
             !logic.ticketLoading &&
@@ -884,10 +892,7 @@ class _PlayerPageState extends State<PlayerPage>
             controlsVisible: _chromeVisible,
           ),
         // 票据三态之三：后端判定不可播放 —— 用 accessType 驱动文案，不在前端猜
-        if (selected &&
-            !theater &&
-            !ready &&
-            logic.blockedEpisodeId == episode.id)
+        if (selected && !theater && locked)
           PlayerBlockedNotice(
             l10n: l10n,
             episode: episode,