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/main.js

@@ -126,6 +126,7 @@ window.addEventListener('load', () => {
   S.audio.addEventListener('timeupdate', updateProgress);
   S.audio.addEventListener('ended', onEnded);
   S.audio.addEventListener('play', () => {
+    S._trackChanging = false;
     absInterrupt();
     setPlayIcon(true);
     document.getElementById('player-art').classList.add('spinning');
@@ -134,16 +135,16 @@ window.addEventListener('load', () => {
   S.audio.addEventListener('pause', () => {
     setPlayIcon(false);
     document.getElementById('player-art').classList.remove('spinning');
-    if(navigator.mediaSession) navigator.mediaSession.playbackState = 'paused';
+    // Suppress during track change — src swap fires pause before the new track starts
+    if(!S._trackChanging && navigator.mediaSession) navigator.mediaSession.playbackState = 'paused';
   });
   S.previewAudio.addEventListener('timeupdate', updatePreviewProgress);
   S.previewAudio.addEventListener('ended', stopPreview);
 
-  // Recovery: try to resume if audio stalls (network hiccup, background throttle)
-  S.audio.addEventListener('stalled', () => { if(!S.audio.paused) S.audio.load(); });
-  S.audio.addEventListener('waiting', () => { /* let browser handle buffering */ });
+  // stalled = browser buffer ran out briefly; let the browser retry naturally.
+  // The watchdog below catches genuine long freezes.
   S.audio.addEventListener('error', () => {
-    if(!S.audio.paused && S.queue[S.qIdx]) {
+    if(S.queue[S.qIdx]) {
       const t = setTimeout(() => { S.audio.load(); S.audio.play().catch(()=>{}); }, 2000);
       S.audio.addEventListener('play', () => clearTimeout(t), { once: true });
     }

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' },

src/state.js

@@ -13,6 +13,7 @@ export const S = {
   previewCurrent: null,
   _scrubbing: false,
   _msPosLast: 0,
+  _trackChanging: false,
   queueOpen: false,
 
   // Now Playing overlay