smaller security and memory improvements

ui/src/components/table/listings/ListingsTable.jsx

@@ -209,6 +209,13 @@ export default function ListingsTable() {
 
   const handleFilterChange = useMemo(() => debounce((value) => setFreeTextFilter(value), 500), []);
 
+  useEffect(() => {
+    return () => {
+      // cleanup debounced handler to avoid memory leaks
+      handleFilterChange.cancel && handleFilterChange.cancel();
+    };
+  }, [handleFilterChange]);
+
   const expandRowRender = (record) => {
     return (
       <div className="listingsTable__expanded">
@@ -235,7 +242,7 @@ export default function ListingsTable() {
               </Tag>
             </Descriptions.Item>
             <Descriptions.Item itemKey="Link">
-              <a href={record.link} target="_blank" rel="noreferrer">
+              <a href={record.link} target="_blank" rel="noopener noreferrer">
                 Link to Listing
               </a>
             </Descriptions.Item>

ui/src/views/jobs/ProcessingTimes.jsx

@@ -79,8 +79,12 @@ export default function ProcessingTimes({ processingTimes = {} }) {
               icon={<IconPlayCircle />}
               aria-label="Start now"
               onClick={async () => {
-                await xhrPost('/api/jobs/startAll', null);
-                Toast.success('Successfully triggered Fredy search.');
+                try {
+                  await xhrPost('/api/jobs/startAll', null);
+                  Toast.success('Successfully triggered Fredy search.');
+                } catch {
+                  Toast.error('Failed to trigger search');
+                }
               }}
             >
               Search now