Add AbortController cleanup to async frontend effects

frontend/src/components/config/ActivateJailDialog.tsx

@@ -106,12 +106,14 @@ export function ActivateJailDialog({
   useEffect(() => {
     if (!open || !jail) return;
 
+    const controller = new AbortController();
     setValidating(true);
     setValidationIssues([]);
     setValidationWarnings([]);
 
     onValidate()
       .then((result) => {
+        if (controller.signal.aborted) return;
         setValidationIssues(result.issues);
       })
       .catch(() => {
@@ -119,8 +121,13 @@ export function ActivateJailDialog({
         // attempt activation and let the server decide.
       })
       .finally(() => {
+        if (controller.signal.aborted) return;
         setValidating(false);
       });
+
+    return (): void => {
+      controller.abort();
+    };
   }, [open, jail, onValidate]);
 
   const handleClose = (): void => {