refactor(modal): remove legacy compatibility paths

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/js/enhancements2.js

@@ -302,7 +302,7 @@
     initParallax();
     initFloatLabels();
     initSigninCalendar();
-    document.addEventListener('aksrt:remote-modal:open', function () {
+    document.addEventListener('aksrt:modal:open', function () {
       // Remote modal may inject calendar markup after open.
       window.setTimeout(initSigninCalendar, 30);
     });