feat: add WebSocket integration for live comment updates

- Introduced `useSocket` to manage WebSocket connections in comment sections.
- Implemented real-time comment updates via `new_comment` WebSocket events.
- Added auto-join and leave for content-specific rooms using WebSocket upon mounting/unmounting.

frontend/src/components/comment-section.tsx

@@ -16,6 +16,7 @@ import {
 import { Textarea } from "@/components/ui/textarea";
 import { cn } from "@/lib/utils";
 import { useAuth } from "@/providers/auth-provider";
+import { useSocket } from "@/providers/socket-provider";
 import { type Comment, CommentService } from "@/services/comment.service";
 
 interface CommentSectionProps {
@@ -24,6 +25,7 @@ interface CommentSectionProps {
 
 export function CommentSection({ contentId }: CommentSectionProps) {
 	const { user, isAuthenticated } = useAuth();
+	const { socket } = useSocket();
 	const [comments, setComments] = React.useState<Comment[]>([]);
 	const [newComment, setNewComment] = React.useState("");
 	const [replyingTo, setReplyingTo] = React.useState<Comment | null>(null);
@@ -45,6 +47,26 @@ export function CommentSection({ contentId }: CommentSectionProps) {
 		fetchComments();
 	}, [fetchComments]);
 
+	// Gestion du WebSocket
+	React.useEffect(() => {
+		if (socket) {
+			socket.emit("join_content", contentId);
+
+			socket.on("new_comment", (comment: Comment) => {
+				setComments((prev) => {
+					// Éviter les doublons si l'auteur reçoit son propre commentaire via WS
+					if (prev.some((c) => c.id === comment.id)) return prev;
+					return [comment, ...prev];
+				});
+			});
+
+			return () => {
+				socket.emit("leave_content", contentId);
+				socket.off("new_comment");
+			};
+		}
+	}, [socket, contentId]);
+
 	const handleSubmit = async (e: React.FormEvent) => {
 		e.preventDefault();
 		if (!newComment.trim() || isSubmitting) return;