fix: replace all native confirm() dialogs with styled modal macros

Migrated ~68 native browser confirm() calls across 74 files to use the
project's confirm_modal/confirm_modal_dynamic Jinja2 macros, providing
consistent styled confirmation dialogs instead of plain browser popups.

Modules updated: core, tenancy, cms, marketplace, messaging, billing,
customers, orders, cart. Uses danger/warning/info variants and
double-confirm pattern for destructive delete operations.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/messaging/static/store/js/email-templates.js

@@ -43,6 +43,9 @@ function storeEmailTemplates() {
         },
         reverting: false,
 
+        // Revert confirm state
+        showRevertConfirm: false,
+
         // Preview Modal
         showPreviewModal: false,
         previewData: null,
@@ -184,10 +187,6 @@ function storeEmailTemplates() {
         async revertToDefault() {
             if (!this.editingTemplate) return;
 
-            if (!confirm(I18n.t('messaging.confirmations.delete_customization'))) {
-                return;
-            }
-
             this.reverting = true;
 
             try {