fix: random albums performance, image cache memory leak, i18n fix (v1.4.1)

- Remove auto-refresh timer from Random Albums (caused 100ms progress
  interval + 30 concurrent fetches every 30s, eventually freezing the app)
- Limit concurrent image fetches to 5 (was unbounded)
- Cap in-memory object URL cache at 150 entries with revokeObjectURL eviction
- Add cancellation flag to useCachedUrl to prevent setState on unmounted components
- Fix hardcoded "Neueste" page title in New Releases (now uses i18n)

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

src/pages/RandomAlbums.tsx

@@ -4,23 +4,14 @@ import { getAlbumList, SubsonicAlbum } from '../api/subsonic';
 import AlbumCard from '../components/AlbumCard';
 import { useTranslation } from 'react-i18next';
 
-const INTERVAL_MS = 30000;
 const ALBUM_COUNT = 30;
 
 export default function RandomAlbums() {
   const { t } = useTranslation();
   const [albums, setAlbums] = useState<SubsonicAlbum[]>([]);
   const [loading, setLoading] = useState(true);
-  const [progress, setProgress] = useState(0);
-  const timerRef = useRef<ReturnType<typeof setInterval> | null>(null);
-  const progressRef = useRef<ReturnType<typeof setInterval> | null>(null);
   const loadingRef = useRef(false);
 
-  const clearTimers = () => {
-    if (timerRef.current) { clearInterval(timerRef.current); timerRef.current = null; }
-    if (progressRef.current) { clearInterval(progressRef.current); progressRef.current = null; }
-  };
-
   const load = useCallback(async () => {
     if (loadingRef.current) return;
     loadingRef.current = true;
@@ -36,27 +27,7 @@ export default function RandomAlbums() {
     }
   }, []);
 
-  const startCycle = useCallback(() => {
-    clearTimers();
-    setProgress(0);
-    const startTime = Date.now();
-    progressRef.current = setInterval(() => {
-      setProgress(Math.min((Date.now() - startTime) / INTERVAL_MS * 100, 100));
-    }, 100);
-    timerRef.current = setInterval(() => {
-      load().then(() => startCycle());
-    }, INTERVAL_MS);
-  }, [load]);
-
-  useEffect(() => {
-    load().then(() => startCycle());
-    return clearTimers;
-  }, [load, startCycle]);
-
-  const handleManualRefresh = () => {
-    clearTimers();
-    load().then(() => startCycle());
-  };
+  useEffect(() => { load(); }, [load]);
 
   return (
     <div className="content-body animate-fade-in">
@@ -64,7 +35,7 @@ export default function RandomAlbums() {
         <h1 className="page-title" style={{ marginBottom: 0 }}>{t('randomAlbums.title')}</h1>
         <button
           className="btn btn-ghost"
-          onClick={handleManualRefresh}
+          onClick={load}
           disabled={loading}
           data-tooltip={t('randomAlbums.refresh')}
         >
@@ -73,11 +44,6 @@ export default function RandomAlbums() {
         </button>
       </div>
 
-      {/* Countdown progress bar */}
-      <div className="random-albums-progress">
-        <div className="random-albums-progress-fill" style={{ width: `${progress}%` }} />
-      </div>
-
       {loading && albums.length === 0 ? (
         <div style={{ display: 'flex', justifyContent: 'center', padding: '4rem' }}>
           <div className="spinner" />