fix(ui): doppelten 'Neu'-Tab vermeiden Backend benennt Tab in 'Neu (10)' um; nur ein Neu-Tab im Frontend

web/src/App.tsx

@@ -230,21 +230,6 @@ export default function App() {
           >
             Favoriten ({favCount})
           </button>
-          {/* Neueste 10 */}
-          <button
-            key="__recent__"
-            className={`tab ${activeFolder === '__recent__' ? 'active' : ''}`}
-            type="button"
-            onClick={async () => {
-              setActiveFolder('__recent__');
-              const resp = await fetchSounds(undefined, '__recent__');
-              setSounds(resp.items);
-              setTotal(resp.total);
-              setFolders(resp.folders);
-            }}
-          >
-            Neu
-          </button>
           {folders.map((f) => (
             <button
               key={f.key}