fix: player bar instant update + stop music on app close

player.js: move NSBridge.setQueue() into requestAnimationFrame so the
updatePlayerUI DOM changes are committed and painted before the blocking
@JavascriptInterface call. setQueue serializes a large JSON payload and
blocks the JS/Blink main thread while Java parses it — deferring it one
frame ensures the player bar visually updates immediately on tap.

MusicService: onTaskRemoved now calls player.stop() + stopSelf() so
swiping the app from recents stops playback instead of leaving it running
in the background.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

android/app/src/main/kotlin/com/novasonic/app/MusicService.kt

@@ -101,8 +101,8 @@ class MusicService : MediaSessionService() {
     override fun onGetSession(controllerInfo: MediaSession.ControllerInfo) = mediaSession
 
     override fun onTaskRemoved(rootIntent: Intent?) {
-        // Keep playing when swiped from recents; only stop if idle/empty
-        if (!player.playWhenReady || player.mediaItemCount == 0) stopSelf()
+        player.stop()
+        stopSelf()
     }
 
     override fun onDestroy() {