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>

src/player.js

@@ -244,9 +244,16 @@ export function playQueue(songs, startIdx) {
     const s = S.queue[S.qIdx];
     if (s) { updatePlayerUI(s, true); onNpSongChange(s.id); }
     renderQueue();
-    try {
-      window.NSBridge.setQueue(JSON.stringify(buildTrackList()), startIdx, true);
-    } catch (e) { console.warn('NSBridge.setQueue failed', e); }
+    // Build the track list now (before rAF) while S.queue is current.
+    const trackListJson = JSON.stringify(buildTrackList());
+    // Defer the NSBridge call to AFTER the current render frame so the
+    // updatePlayerUI DOM changes are committed and visible before the
+    // @JavascriptInterface call (which blocks the JS thread while Java
+    // parses the JSON and creates MediaItems).
+    requestAnimationFrame(() => {
+      try { window.NSBridge.setQueue(trackListJson, startIdx, true); }
+      catch (e) { console.warn('NSBridge.setQueue failed', e); }
+    });
     if (S.radioMode) fillRadioQueue();
     return;
   }