Bug -> try to fix bug

public/assets/js/app.js

@@ -93,7 +93,7 @@ document.addEventListener('DOMContentLoaded', () => {
 
     /* ── Shared helper ── */
     function copyToClipboard(text, btn, successLabel, defaultLabel) {
-        navigator.clipboard.writeText(text).then(() => {
+        const doSuccess = () => {
             const span = btn.querySelector('span') || btn;
             btn.classList.add('copied');
             span.textContent = successLabel;
@@ -101,6 +101,21 @@ document.addEventListener('DOMContentLoaded', () => {
                 btn.classList.remove('copied');
                 span.textContent = defaultLabel;
             }, 2000);
-        });
+        };
+
+        if (navigator.clipboard && navigator.clipboard.writeText) {
+            navigator.clipboard.writeText(text).then(doSuccess);
+        } else {
+            const ta = document.createElement('textarea');
+            ta.value = text;
+            ta.style.position = 'fixed';
+            ta.style.opacity = '0';
+            document.body.appendChild(ta);
+            ta.focus();
+            ta.select();
+            document.execCommand('copy');
+            document.body.removeChild(ta);
+            doSuccess();
+        }
     }
 });