feat: auto-refresh the scan button until the worker finishes

web/src/app/settings/settings-form.tsx

@@ -39,6 +39,16 @@ export function SettingsForm() {
     setScanRequested(true);
   }
 
+  useEffect(() => {
+    if (!scanRequested) return;
+    const id = setInterval(async () => {
+      const s = await (await fetch("/api/scan")).json();
+      setScanResult(s.result);
+      if (!s.requested) setScanRequested(false); // worker finished the scan
+    }, 2000);
+    return () => clearInterval(id);
+  }, [scanRequested]);
+
   useEffect(() => {
     fetch("/api/config")
       .then((r) => r.json())