chore(web): bump service-worker cache to ns-v42

Forces installed PWAs to pull the new build (metadata "&" split + forward
navigation fixes) instead of serving stale cached assets.

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

public/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'ns-v41';
+const CACHE = 'ns-v42';
 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.