Fix PWA install: static manifest.json + proper SVG icon

- Replace blob: manifest (ignored by Chrome) with static manifest.json
- Replace data: URL icon with real icon.svg file
- Link manifest and apple-touch-icon directly in <head>
- Remove blob/data URL generation from app.js

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

app.js

@@ -1251,14 +1251,6 @@ async function loadArtists(){
 
 // ─── PWA ───
 function injectPWA(){
-  const m={name:'NovaSonic',short_name:'NovaSonic',description:'Subsonic/Navidrome Music Client',
-    start_url:'index.html',display:'standalone',background_color:'#07070f',theme_color:'#07070f',
-    icons:[{src:"data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><rect width='100' height='100' rx='20' fill='%23e8a020'/><text y='.9em' font-size='70' x='15'>&#9835;</text></svg>",sizes:'192x192',type:'image/svg+xml'}]};
-  try{
-    const blob=new Blob([JSON.stringify(m)],{type:'application/json'});
-    const link=document.createElement('link');link.rel='manifest';link.href=URL.createObjectURL(blob);
-    document.head.appendChild(link);
-  }catch{}
   if ('serviceWorker' in navigator) {
     navigator.serviceWorker.register('sw.js').catch(() => {});
   }