add ws close wen component unmount

src/frontend/src/modals/formModal/index.tsx

@@ -330,6 +330,15 @@ export default function FormModal({
     // do not add connectWS on dependencies array
   }, [open]);
 
+  useEffect(() => {
+    return () => {
+      if (ws.current) {
+        console.log("closing ws");
+        ws.current.close();
+      }
+    };
+  }, []);
+
   useEffect(() => {
     if (
       ws.current &&