fix: prevent notification close on skip and background audio stall

- playCurrent: set _trackChanging flag and update media session metadata
  before changing src, so the pause event fired by src-swap does not
  set playbackState='paused' and dismiss the Samsung cover screen notification
- Remove stalled->load() handler that silently paused audio with no recovery
- Error handler now retries regardless of paused state (load() causes paused)
- Add .catch() to audio.play() in playCurrent

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

src/player.js

@@ -17,11 +17,12 @@ export function playQueue(songs, startIdx) {
 export function playCurrent() {
   if(S.qIdx < 0 || S.qIdx >= S.queue.length) return;
   const s = S.queue[S.qIdx];
-  S.audio.src = streamUrl(s.id);
-  S.audio.play();
-  updatePlayerUI(s);
+  S._trackChanging = true;
+  updatePlayerUI(s);        // update metadata/notification BEFORE src change
   onNpSongChange(s.id);
   renderQueue();
+  S.audio.src = streamUrl(s.id);
+  S.audio.play().catch(() => {});
 }
 
 export function updatePlayerUI(s) {
@@ -122,6 +123,8 @@ export function setPlayIcon(playing) {
     const cover = document.getElementById('np-cover');
     if(cover) cover.classList.toggle('playing', playing);
   }
+  // Android native MediaSession bridge
+  if (window.Android) { try { window.Android.setPlaybackState(playing); } catch(_) {} }
 }
 
 export function prevSong() {
@@ -193,9 +196,16 @@ export async function fillRadioQueue() {
 }
 
 // ─── PROGRESS & SCRUBBING ───
+let _androidPosTick = 0;
 export function updateProgress() {
   if(!S.audio.duration || S._scrubbing) return;
   syncMediaSessionPosition();
+  // Update Android native position every ~5 seconds to keep lock screen scrubber in sync
+  const now = Date.now();
+  if(now - _androidPosTick > 5000) {
+    _androidPosTick = now;
+    if (window.Android) { try { window.Android.updatePosition(S.audio.currentTime, S.audio.duration); } catch(_) {} }
+  }
   const p = (S.audio.currentTime / S.audio.duration) * 100;
   document.getElementById('progress-fill').style.width = p + '%';
   document.getElementById('time-cur').textContent = formatDur(S.audio.currentTime);
@@ -279,6 +289,18 @@ export function setVolume(v) {
 
 // ─── MEDIA SESSION ───
 export function updateMediaSession(s) {
+  // Android native MediaSession bridge — use 512px art for high-DPI screens
+  if (window.Android) {
+    try {
+      window.Android.updateTrack(
+        s.title || '',
+        s.artist || '',
+        s.coverArt ? coverUrl(s.coverArt, 512) : '',
+        s.duration || 0
+      );
+    } catch(_) {}
+  }
+
   if(!navigator.mediaSession) return;
   const artwork = s.coverArt ? [
     { src: coverUrl(s.coverArt,96),  sizes:'96x96',  type:'image/jpeg' },