fix: download notification opened the wrong song (same-name album)

The finished-download notification resolved the album by name via search3, then fell back to
a same-named album by a DIFFERENT artist (or the first result) when the exact artist match
wasn't found — e.g. right after download, before Navidrome rescans. Many artists share an album
title ("I LIKE IT!"), so the notification navigated to a completely different song.

- Web (notify.js) + Android (AppNavigation): require the artist to match when known (fuzzy for
  multi-artist / album-artist drift); drop the name-only and first-result fallbacks. If nothing
  matches, show "wird evtl. gerade gescannt" instead of opening a wrong album.

The download itself was correct all along (verified: it grabbed UPSAHL's official "I LIKE IT!"
visualizer) — only the notification's navigation was wrong. SW ns-v63.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'ns-v62';
+const CACHE = 'ns-v63';
 const PRECACHE = ['/', 'index.html', 'manifest.json', 'icon.svg'];
 const SKIP_PATHS = ['/rest/stream', '/rest/download', '/config.js'];
 // Auth token params stripped from cache keys so artwork survives across sessions/token refreshes.