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>

src/ui/modals.js

@@ -1,6 +1,6 @@
 import { S } from '../state.js';
 import { esc, toast } from '../utils.js';
-import { api, coverUrl, ndAuth } from '../api.js';
+import { api, coverUrl, ndAuth, invalidateApiCache } from '../api.js';
 // Circular — safe (only used inside function bodies)
 import { playQueue, dlSongLocal, nativeInsertAt, renderQueue } from '../player/player.js';
 import { navigate, loadPlaylists, loadPlaylistDetail } from '../views/views.js';
@@ -235,6 +235,7 @@ export async function deletePlaylist() {
     await api('deletePlaylist', `&id=${pl.id}`);
     closeEditPlModal();
     toast(`🗑 "${pl.name}" gelöscht`);
+    invalidateApiCache('getPlaylists'); // drop the 3-min cache so the list reloads without the deleted playlist
     navigate('playlists');
   } catch(e) { toast('Fehler beim Löschen: ' + e.message); }
 }