rename content into message for notifications

src/components/Header/Header.tsx

@@ -40,7 +40,7 @@ function Header() {
 
                 const data: Notification[] = notifData || [];
                 setNotifications(data);
-                const hasUnread = data.some(n => n.pivot && n.pivot.unread === 1);
+                const hasUnread = data.some(n => n.read_at === null);
                 setunreadNotification(hasUnread);
             } catch (err) {
                 console.error("Erreur initialisation Header:", err);