fix(sports): wizard view crash when $registration undefined on index page

Move PHP reference to total_fees into a JS variable that's safely set with
isset() check, fixing the undefined variable error on the registration list page.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Modules/SportsActivity/Views/registration/wizard.php

@@ -285,6 +285,7 @@ document.addEventListener('DOMContentLoaded', function() {
     if (typeof lucide !== 'undefined') lucide.createIcons();
 
     var regId = document.getElementById('wizardApp') ? document.getElementById('wizardApp').dataset.registrationId : null;
+    var regFee = <?= isset($registration) ? (int) $registration['total_fees'] : 0 ?>;
     var csrfToken = document.querySelector('meta[name="csrf-token"]') ? document.querySelector('meta[name="csrf-token"]').content : '';
     var csrfInput = document.querySelector('input[name="_csrf_token"]');
     if (csrfInput) csrfToken = csrfInput.value;
@@ -419,7 +420,7 @@ document.addEventListener('DOMContentLoaded', function() {
                 } else {
                     alert(data.error || 'حدث خطأ');
                     btnPayForm.disabled = false;
-                    btnPayForm.textContent = 'إرسال للخزينة — <?= (int) $registration['total_fees'] ?> ج.م';
+                    btnPayForm.textContent = 'إرسال للخزينة — ' + regFee + ' ج.م';
                 }
             });
         });