Merge commit '2f932cb2bb' into kb_migration

app/javascript/packs/sign_up.js

@@ -13,4 +13,30 @@ ready(() => {
       console.error(error);
     });
   }, 5000);
+
+  document.querySelectorAll('.timer-button').forEach(button => {
+    let counter = 30;
+
+    const container = document.createElement('span');
+
+    const updateCounter = () => {
+      container.innerText = ` (${counter})`;
+    };
+
+    updateCounter();
+
+    const countdown = setInterval(() => {
+      counter--;
+
+      if (counter === 0) {
+        button.disabled = false;
+        button.removeChild(container);
+        clearInterval(countdown);
+      } else {
+        updateCounter();
+      }
+    }, 1000);
+
+    button.appendChild(container);
+  });
 });