fix: player height collapse and danmaku empty state

components/DanmakuList.tsx

@@ -58,7 +58,9 @@ export default function DanmakuList({ danmakus, currentTime, visible, onToggle }
             </Text>
           )}
           ListEmptyComponent={
-            <Text style={styles.empty}>暂无弹幕</Text>
+            <Text style={styles.empty}>
+              {danmakus.length === 0 ? '暂无弹幕' : '弹幕将随视频播放显示'}
+            </Text>
           }
         />
       )}

components/NativeVideoPlayer.tsx

@@ -314,7 +314,7 @@ export function NativeVideoPlayer({
   };
 
   return (
-    <View style={[styles.container, style]}>
+    <View style={[styles.container, { width: SCREEN_W, height: VIDEO_H }, style]}>
       {resolvedUrl ? (
         <Video
           key={resolvedUrl}