feat(web): Enter in the importer field starts the import

Pressing Enter in the importer link input now triggers resolveImporterLink()
(same as the Importieren button). Bump SW cache to ns-v45.

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

public/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'ns-v44';
+const CACHE = 'ns-v45';
 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.