fix: invalidate sort caches after metadata save, remove sort-debug logs

After saving sort tags via the metadata editor, invalidate _artistSortMap
and the apiCached getArtists entry so the updated Navidrome sortName values
are picked up on the next page visit without a hard refresh.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ui/metadata.js

@@ -1,6 +1,6 @@
 import { S } from '../state.js';
 import { esc, formatDur, toast } from '../utils.js';
-import { api, coverUrl, fetchRomajiIndex, romajiLookup, getRomajiOverrides } from '../api.js';
+import { api, coverUrl, fetchRomajiIndex, romajiLookup, getRomajiOverrides, invalidateRomajiIndex, invalidateApiCache } from '../api.js';
 // Circular — safe (only used inside function bodies)
 import { loadPlaylists, loadPlaylistDetail } from '../views/views.js';
 import { showConfirm } from './modals.js';
@@ -270,6 +270,8 @@ export async function saveMetadata() {
     if (!r.ok) throw new Error(d.error || `HTTP ${r.status}`);
     status.textContent = '✅ Gespeichert! Navidrome scannt…';
     toast('✅ Metadaten gespeichert');
+    invalidateRomajiIndex();
+    invalidateApiCache('getArtists');
     setTimeout(() => { _leaveEditMode(); closeInfoModal(); }, 1500);
   } catch (e) {
     status.textContent = '❌ Fehler: ' + e.message;