Fix SRT subtitle conversion and default selection

src/components/VideoElement.tsx

@@ -265,6 +265,28 @@ export const VideoElement: React.FC<VideoElementProps> = ({
     }
   }, [subtitles])
 
+  useEffect(() => {
+    const video = videoRef.current
+    if (!video) return
+    if (processedSubtitles.length === 0) return
+    if (settings.subtitle) return
+
+    const defaultSubtitle = processedSubtitles.find((subtitle) => subtitle.default)
+    if (!defaultSubtitle) return
+
+    const tracks = video.textTracks
+    if (!tracks || tracks.length === 0) return
+
+    for (let i = 0; i < tracks.length; i++) {
+      const track = tracks[i]
+      if (track.language === defaultSubtitle.lang) {
+        track.mode = 'showing'
+        setSubtitle(defaultSubtitle)
+        break
+      }
+    }
+  }, [processedSubtitles, settings.subtitle, setSubtitle, videoRef])
+
   // Detect HLS source and load hls.js if needed
   useEffect(() => {
     const video = videoRef.current