优化视频加载速度

components/video-grid-layout.tsx

@@ -111,6 +111,8 @@ function VideoGridLayoutComponent({ videos, onEdit, onDelete }: VideoGridLayoutP
               loop
               muted={isMuted[video.id] !== false} // 默认静音，除非明确设置为false
               playsInline
+              preload="auto"
+              poster={`${video.url}?vframe/jpg/offset/1`}
               onLoadedData={() => {
                 // 设置默认音量
                 if (videoRefs.current[video.id] && !volume[video.id]) {

components/video-screen-layout.tsx

@@ -171,6 +171,7 @@ function VideoScreenLayoutComponent({ videos }: VideoScreenLayoutProps) {
                 muted={index === currentIndex ? isMuted : true} // 只有当前视频受状态控制
                 playsInline
                 preload="auto"
+                poster={`${video.url}?vframe/jpg/offset/1`}
                 onLoadedData={() => {
                   if (index === currentIndex && videoRefs.current[index]) {
                     applyVolumeSettings(videoRefs.current[index]!);