chore:added initial value for useRef statement within src/app/interface/panel/index.tsx to not run into additional build related errors.

Author: DeveloperMindset123

arise-my-manhwa/src/app/interface/panel/index.tsx

@@ -113,7 +113,7 @@ export function Panel({
   const [revision, setRevision] = useState(0);
 
   // keep a ref in sync
-  const renderedRef = useRef<RenderedScene>();
+  const renderedRef = useRef<RenderedScene>(null);
   const renderedKey = JSON.stringify(rendered);
   useEffect(() => {
     renderedRef.current = rendered;