fix: 429 retry, safety counter, local file filter in Spotify pagination

src/spotify.js

@@ -51,6 +51,7 @@ export async function resolveSpotifyLink() {
     }
     const data = await res.json();
     window._spotifyResolved = data;
+    if (data.skippedLocal > 0) toast(`${data.skippedLocal} lokale Datei(en) übersprungen (kein Stream verfügbar)`);
     _renderSpotifyPreview(data);
   } catch(e) {
     inner.innerHTML = `<div style="color:var(--danger);padding:16px;background:var(--surface);border-radius:10px">${esc(e.message)}</div>`;