fix: missing session item for mercure alert topic

src/Controller/IndexController.php

@@ -12,15 +12,12 @@ use Symfony\Component\Routing\Attribute\Route;
 final class IndexController extends AbstractController
 {
     public function __construct(
-        private readonly DownloadRepository $downloadRepository,
         private readonly Tmdb $tmdb,
     ) {}
 
     #[Route('/', name: 'app_index')]
     public function index(Request $request): Response
     {
-        $request->getSession()->set('mercure_alert_topic', 'alerts_' . uniqid());
-
         return $this->render('index/index.html.twig', [
             'active_downloads' => $this->getUser()->getActiveDownloads(),
             'recent_downloads' => $this->getUser()->getDownloads(),