refactor(ui): 清理 K26 旧 UI 与死代码

lib/pages/player/player_view.dart

@@ -162,7 +162,7 @@ class _PlayerPageState extends State<PlayerPage> with WidgetsBindingObserver {
         logic.session.preparedPlayerAt(index);
     final videoPort = port is VideoPlayerPort ? port : null;
     final ready = videoPort?.controller.value.isInitialized ?? false;
-    final theater = logic.fullscreen || logic.pip || logic.pipPreparing;
+    final theater = logic.pip || logic.pipPreparing;
     Widget? video;
     if (ready) {
       video = GestureDetector(
@@ -322,20 +322,7 @@ class _PlayerPageState extends State<PlayerPage> with WidgetsBindingObserver {
           ),
         if (logic.pip || logic.pipPreparing)
           const SizedBox.expand()
-        else if (logic.fullscreen)
-          _FullscreenControls(
-            l10n: l10n,
-            controller: ready ? videoPort!.controller : null,
-            onClose: () => unawaited(logic.setFullscreen(false)),
-            onPip: logic.pictureInPicture.isPlatformSupported
-                ? () => unawaited(logic.enterPip(context))
-                : null,
-            onScrubStart: ready ? () => logic.beginScrub(videoPort!) : null,
-            onSeek: ready
-                ? (position) => logic.seekTo(context, videoPort!, position)
-                : null,
-          )
-        else if (!logic.screenCleared && widget.homeMode)
+        else if (widget.homeMode)
           HomeFeedOverlay(
             l10n: l10n,
             drama: drama,
@@ -375,13 +362,12 @@ class _PlayerPageState extends State<PlayerPage> with WidgetsBindingObserver {
             onShare: () => logic.shareDrama(context, drama),
             onEpisodes: () => logic.showEpisodes(context),
             onDownload: () => requestEpisodeDownload(context, episode.id),
-            onClear: () => logic.setScreenCleared(true),
             onSearch: widget.onSearch ?? () => logic.showDiscover(context),
             onPip: logic.pictureInPicture.isPlatformSupported
                 ? () => unawaited(logic.enterPip(context))
                 : null,
           )
-        else if (!logic.screenCleared)
+        else
           _PlaybackOverlay(
             l10n: l10n,
             drama: drama,
@@ -441,81 +427,11 @@ class _PlayerPageState extends State<PlayerPage> with WidgetsBindingObserver {
                 ? (position) => logic.seekTo(context, videoPort!, position)
                 : null,
           ),
-        if (logic.screenCleared)
-          SafeArea(
-            child: Align(
-              alignment: Alignment.topRight,
-              child: Padding(
-                padding: const EdgeInsets.only(top: 4, right: 8),
-                child: IconButton(
-                  tooltip: l10n.exitClearScreen,
-                  onPressed: () => logic.setScreenCleared(false),
-                  style: IconButton.styleFrom(
-                    foregroundColor: Colors.white,
-                    backgroundColor: const Color(0x59000000),
-                  ),
-                  icon: const Icon(Icons.close_fullscreen_rounded),
-                ),
-              ),
-            ),
-          ),
       ],
     );
   }
 }
 
-class _FullscreenControls extends StatelessWidget {
-  const _FullscreenControls({
-    required this.l10n,
-    required this.controller,
-    required this.onClose,
-    required this.onPip,
-    required this.onScrubStart,
-    required this.onSeek,
-  });
-
-  final AppLocalizations l10n;
-  final VideoPlayerController? controller;
-  final VoidCallback onClose;
-  final VoidCallback? onPip;
-  final VoidCallback? onScrubStart;
-  final Future<void> Function(Duration)? onSeek;
-
-  @override
-  Widget build(BuildContext context) => SafeArea(
-    child: Column(
-      children: [
-        Row(
-          children: [
-            IconButton(
-              tooltip: l10n.exitFullscreen,
-              onPressed: onClose,
-              icon: const Icon(Icons.close_fullscreen_rounded),
-            ),
-            const Spacer(),
-            if (onPip != null)
-              IconButton(
-                tooltip: l10n.pictureInPicture,
-                onPressed: onPip,
-                icon: const Icon(Icons.picture_in_picture_alt_outlined),
-              ),
-          ],
-        ),
-        const Spacer(),
-        Padding(
-          padding: const EdgeInsets.fromLTRB(20, 0, 20, 16),
-          child: SeekProgressBar(
-            valueListenable: controller,
-            semanticsLabel: l10n.seekVideo,
-            onScrubStart: onScrubStart,
-            onSeek: onSeek,
-          ),
-        ),
-      ],
-    ),
-  );
-}
-
 /// 不可播放提示：文案由后端返回的 `accessType` 驱动（契约 §1.4），前端不自行推断。
 class _BlockedNotice extends StatelessWidget {
   const _BlockedNotice({