fix(frontend): Error Boundary, HomePage error state, HLS catch — quick wins pre-Bloc-B

frontend/src/pages/HomePage.tsx

@@ -19,11 +19,12 @@ interface VideosResponse {
 export default function HomePage() {
   const [videos, setVideos] = useState<Video[]>([]);
   const [loading, setLoading] = useState(true);
+  const [error, setError] = useState(false);
 
   useEffect(() => {
     apiFetch<VideosResponse>('/videos')
       .then((res) => setVideos(res.data.videos))
-      .catch(() => setVideos([]))
+      .catch(() => setError(true))
       .finally(() => setLoading(false));
   }, []);
 
@@ -47,7 +48,11 @@ export default function HomePage() {
         </div>
       )}
 
-      {!loading && (
+      {error && (
+        <p className="text-sm text-od-crit">Impossible de charger les vidéos. Réessaie plus tard.</p>
+      )}
+
+      {!loading && !error && (
         <>
           {free.length > 0 && (
             <section>