Add copy feedback for User ID copy buttons

Author: mytherapy-coding

script.js

@@ -1015,7 +1015,16 @@ function handleGenerateUserIds() {
 
     const btn = document.createElement("button");
     btn.textContent = "Copy";
-    btn.addEventListener("click", () => copyToClipboard(id));
+    btn.addEventListener("click", async () => {
+      const ok = await copyToClipboard(id);
+      const prev = btn.textContent;
+      btn.textContent = ok ? "Copied!" : "Copy failed";
+      btn.disabled = true;
+      setTimeout(() => {
+        btn.textContent = prev;
+        btn.disabled = false;
+      }, 1500);
+    });
 
     row.appendChild(span);
     row.appendChild(btn);