fix: 修复小窗闭包过期、详情页 loading 卡死、视频播放器性能问题

- 小窗 PanResponder 用 storeRef 替代闭包捕获，修复 roomId/bvid 始终为初始值
- useLiveDetail 用 ref 比对替代 cancelled 标志，防止 fetch 被意外取消
- 详情页 useLayoutEffect 同步清除小窗，BigVideoCard 小窗活跃时跳过播放
- 视频播放器竖屏/全屏互斥渲染，减半解码器占用
- onProgress 节流 + 退出全屏强制恢复播放

components/LiveMiniPlayer.tsx

@@ -52,6 +52,10 @@ export function LiveMiniPlayer() {
   const pan = useRef(new Animated.ValueXY()).current;
   const isDragging = useRef(false);
 
+  // 用 ref 保持最新值，避免 PanResponder 闭包捕获过期的初始值
+  const storeRef = useRef({ roomId, clearLive, router });
+  storeRef.current = { roomId, clearLive, router };
+
   const panResponder = useRef(
     PanResponder.create({
       onStartShouldSetPanResponder: () => true,
@@ -71,10 +75,11 @@ export function LiveMiniPlayer() {
         pan.flattenOffset();
         if (!isDragging.current) {
           const { locationX, locationY } = evt.nativeEvent;
+          const { roomId: rid, clearLive: clear, router: r } = storeRef.current;
           if (locationX > MINI_W - 28 && locationY < 28) {
-            clearLive();
+            clear();
           } else {
-            router.push(`/live/${roomId}` as any);
+            r.push(`/live/${rid}` as any);
           }
           return;
         }