fix: Android lock screen notification + radio mode + SW auto-update reliability

- Set mediaSession.playbackState='playing'/'paused' so Android keeps the
  notification alive when the screen sleeps
- Provide 96x96/300x300/512x512 artwork sizes for Android notification views
- playQueue() now calls fillRadioQueue() immediately when radio mode is on,
  so the infinite queue works without toggling radio off/on
- SW: add GET_VERSION/VERSION message handler for version-query fallback
- SW registration: updateViaCache:'none' prevents browser HTTP-caching sw.js
- Bump cache to ns-v30

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

app.js

@@ -116,8 +116,8 @@ window.addEventListener('load',()=>{
   document.getElementById('srv-pass').addEventListener('keydown',e=>{if(e.key==='Enter')doConnect()});
   audio.addEventListener('timeupdate',updateProgress);
   audio.addEventListener('ended',onEnded);
-  audio.addEventListener('play',()=>{setPlayIcon(true);document.getElementById('player-art').classList.add('spinning')});
-  audio.addEventListener('pause',()=>{setPlayIcon(false);document.getElementById('player-art').classList.remove('spinning')});
+  audio.addEventListener('play',()=>{setPlayIcon(true);document.getElementById('player-art').classList.add('spinning');if(navigator.mediaSession)navigator.mediaSession.playbackState='playing';});
+  audio.addEventListener('pause',()=>{setPlayIcon(false);document.getElementById('player-art').classList.remove('spinning');if(navigator.mediaSession)navigator.mediaSession.playbackState='paused';});
   previewAudio.addEventListener('timeupdate',updatePreviewProgress);
   previewAudio.addEventListener('ended',stopPreview);
   audio.volume=0.8;
@@ -975,7 +975,7 @@ function dlSongLocal(s){
 function downloadCurrent(){if(qIdx>=0&&queue[qIdx])dlSongLocal(queue[qIdx])}
 
 // ─── PLAYER ───
-function playQueue(songs,startIdx){queue=songs.map(s=>({...s}));qIdx=startIdx;playCurrent();renderQueue()}
+function playQueue(songs,startIdx){queue=songs.map(s=>({...s}));qIdx=startIdx;playCurrent();renderQueue();if(radioMode)fillRadioQueue();}
 function playCurrent(){
   if(qIdx<0||qIdx>=queue.length)return;
   const s=queue[qIdx];
@@ -1025,7 +1025,8 @@ function _syncNpDirect(s){
 }
 function updateMediaSession(s){
   if(!navigator.mediaSession)return;
-  navigator.mediaSession.metadata=new MediaMetadata({title:s.title,artist:s.artist||'',album:s.album||'',artwork:s.coverArt?[{src:coverUrl(s.coverArt,300),sizes:'300x300'}]:[]});
+  const artwork=s.coverArt?[{src:coverUrl(s.coverArt,96),sizes:'96x96',type:'image/jpeg'},{src:coverUrl(s.coverArt,300),sizes:'300x300',type:'image/jpeg'},{src:coverUrl(s.coverArt,512),sizes:'512x512',type:'image/jpeg'}]:[];
+  navigator.mediaSession.metadata=new MediaMetadata({title:s.title,artist:s.artist||'',album:s.album||'',artwork});
   navigator.mediaSession.setActionHandler('play',togglePlay);
   navigator.mediaSession.setActionHandler('pause',togglePlay);
   navigator.mediaSession.setActionHandler('previoustrack',prevSong);
@@ -1330,24 +1331,28 @@ async function loadArtists(){
 // ─── PWA ───
 function injectPWA(){
   if (!('serviceWorker' in navigator)) return;
-  navigator.serviceWorker.register('sw.js').then(reg => {
-    // Force-check for SW update every time the app opens
-    reg.update().catch(() => {});
-    // New SW found while page is open (e.g. user left tab open overnight)
-    reg.addEventListener('updatefound', () => {
-      const sw = reg.installing;
-      if (!sw) return;
-      sw.addEventListener('statechange', () => {
-        // 'installed' + existing controller = update ready but waiting for skipWaiting
-        // With skipWaiting() this fires briefly; the SW_UPDATED message handles the banner
-      });
-    });
-  }).catch(() => {});
 
-  // SW posts SW_UPDATED after it activates and claims this client
+  // Listen before registering so we never miss a message
   navigator.serviceWorker.addEventListener('message', e => {
-    if (e.data?.type === 'SW_UPDATED') showUpdateBanner(e.data.version);
+    if (e.data?.type === 'SW_UPDATED') {
+      localStorage.setItem('sw-version', e.data.version);
+      showUpdateBanner(e.data.version);
+    }
+    // Version query response — covers the race where SW activated before this listener
+    if (e.data?.type === 'VERSION') {
+      const prev = localStorage.getItem('sw-version');
+      if (prev && prev !== e.data.version) showUpdateBanner(e.data.version);
+      localStorage.setItem('sw-version', e.data.version);
+    }
   });
+
+  // updateViaCache:'none' prevents the browser HTTP cache from hiding SW file changes
+  navigator.serviceWorker.register('sw.js', { updateViaCache: 'none' }).then(reg => {
+    reg.update().catch(() => {});
+    // Query active SW version right now to catch updates that happened before page JS ran
+    const ctrl = navigator.serviceWorker.controller;
+    if (ctrl) ctrl.postMessage({ type: 'GET_VERSION' });
+  }).catch(() => {});
 }
 
 function showUpdateBanner(version) {