fix: playlist cover upload via PUT /api/playlist/{id} with base64 imageData

Navidrome (react-admin) expects image as base64 data URL in JSON body,
not as a raw binary POST to /image endpoint. Bump SW to ns-v35.

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

app.js

@@ -505,11 +505,13 @@ async function editPlCoverSelected(input){
   const preview=URL.createObjectURL(file);
   document.getElementById('edit-pl-cover').innerHTML=`<img src="${preview}" style="width:100%;height:100%;object-fit:cover">`;
   try{
+    const imageData=await new Promise((res,rej)=>{const r=new FileReader();r.onload=()=>res(r.result);r.onerror=rej;r.readAsDataURL(file);});
     const token=await ndAuth();
-    const res=await fetch(`${cfg.url}/api/playlist/${_currentPlaylist.id}/image`,{
-      method:'POST',
-      headers:{'X-Nd-Authorization':'Bearer '+token,'Content-Type':file.type||'image/jpeg'},
-      body:file
+    const pl=_currentPlaylist;
+    const res=await fetch(`${cfg.url}/api/playlist/${pl.id}`,{
+      method:'PUT',
+      headers:{'X-Nd-Authorization':'Bearer '+token,'Content-Type':'application/json'},
+      body:JSON.stringify({name:pl.name,comment:pl.comment||'',public:!!pl.public,imageData})
     });
     if(!res.ok)throw new Error(res.status);
     toast('Cover aktualisiert');

sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'ns-v34';
+const CACHE = 'ns-v35';
 const PRECACHE = ['/', 'index.html', 'styles.css', 'app.js', 'manifest.json', 'icon.svg'];
 const SKIP_PATHS = ['/rest/stream', '/rest/download', '/config.js'];