feat: not-found url error

src/app/page.tsx

@@ -13,6 +13,7 @@ export default function Home() {
   const [url, setUrl] = useState("");
   const [expiryTime, setExpiryTime] = useState(0);
   const [isLoading, setIsLoading] = useState(true);
+  const [notFound, setNotFound] = useState(false);
   const initData = useRawInitData();
   const onCopyClick = async () => {
     if (!url.length) return;
@@ -32,12 +33,24 @@ export default function Home() {
         setIsLoading(false);
       } catch (e) {
         console.error(e);
+        setNotFound(true);
+        setIsLoading(false);
       }
     };
     fetchData();
   }, [initData]);
   if (isLoading) return <Loader />;
 
+  if (notFound) {
+    return (
+      <Page back={false}>
+        <main className="absolute bottom-0 left-0 flex w-full flex-col items-center gap-3 px-2.5 py-3.5 text-[var(--tg-theme-text-color)]">
+          <Block name="Ссылка">Ссылка не найдена</Block>
+        </main>
+      </Page>
+    );
+  }
+
   return (
     <Page back={false}>
       <header className="flex h-12 w-full flex-col items-center justify-center bg-[var(--tg-theme-header-bg-color)]">