fix(sessions): open instance URL in new tab

Update handleOpen in SessionsPage to open the instance URL
in a new tab when available, instead of navigating to the
project page. Falls back to project navigation if no URL.

apps/web/src/pages/sessions.tsx

@@ -156,7 +156,11 @@ export const SessionsPage = () => {
   };
 
   const handleOpen = (session: Session) => {
-    navigate(`/projects/${session.project_name}/repositories/${session.repository_name}`);
+    if (session.url) {
+      window.open(session.url, '_blank', 'noopener,noreferrer');
+    } else {
+      navigate(`/projects/${session.project_id}`);
+    }
   };
 
   const handleResumeLast = async () => {