feat(web): refresh the current view after deleting a song or playlist

Deletes left the removed item visible because the list loaders are cached (getPlaylists
~3 min): deletePlaylist navigated to a still-cached list, and deleteSong only reloaded
playlists. Add refreshCurrentView() — drops the API cache and re-runs the active nav
entry's loader (playlists, playlist/album/artist detail, starred, home, …). deleteSong
calls it after the delete+rescan delay; deletePlaylist invalidates getPlaylists before
navigating. Bump SW cache to ns-v46.

Also record the post-1.2 work in the 1.2 changelog (importer Enter, search single-song
+ radio, NowPlaying order, official-audio artist-metadata match, JP-katakana album
artist fix, year back-fill, delete refresh).

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

public/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'ns-v45';
+const CACHE = 'ns-v46';
 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.