Fix ESLint: use window.confirm instead of confirm in admin.js

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

assets/admin.js

@@ -3,7 +3,7 @@ import "./admin.scss"
 document.addEventListener('DOMContentLoaded', () => {
     document.querySelectorAll('[data-confirm]').forEach(form => {
         form.addEventListener('submit', (e) => {
-            if (!confirm(form.dataset.confirm)) {
+            if (!window.confirm(form.dataset.confirm)) {
                 e.preventDefault()
             }
         })