new: usr: add timer for the acceptance of the challenge #4

assets/js/mine-seeker/components/ChallengeCountdown.jsx

@@ -0,0 +1,41 @@
+/**
+ * This file is part of the SplendidBear Websites' projects.
+ *
+ * Copyright (c) 2026 @ www.splendidbear.org
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+import { Fragment, useEffect, useState } from 'react';
+
+const ChallengeCountdown = ({ onAccept, onDecline, seconds = 30 }) => {
+  const [countdown, setCountdown] = useState(seconds);
+
+  useEffect(() => {
+    const interval = setInterval(() => {
+      setCountdown(prev => {
+        if (1 >= prev) {
+          clearInterval(interval);
+          onDecline();
+          return 0;
+        }
+        return prev - 1;
+      });
+    }, 1000);
+    return () => clearInterval(interval);
+  }, [onDecline]);
+
+  return (
+    <Fragment>
+      <p style={{ textAlign: 'center', marginBottom: 20, color: '#95cff5' }}>
+        You have {countdown} second{1 === countdown ? '' : 's'} to answer to the challenge!
+      </p>
+      <div className="resign">
+        <a onClick={onAccept}>Accept</a>
+        <a onClick={onDecline}>Decline</a>
+      </div>
+    </Fragment>
+  );
+};
+
+export default ChallengeCountdown;