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/cms/static/store/js/content-page-edit.js

@@ -40,6 +40,9 @@ function storeContentPageEditor(pageId) {
         loadingDefault: false,
         defaultContent: null,
 
+        // Delete confirmation modal state
+        showDeletePageConfirm: false,
+
         // Initialize
         async init() {
             // Prevent multiple initializations
@@ -211,14 +214,6 @@ function storeContentPageEditor(pageId) {
 
         // Delete page (revert to default for overrides)
         async deletePage() {
-            const message = this.isOverride
-                ? 'Are you sure you want to revert to the platform default? Your customizations will be lost.'
-                : 'Are you sure you want to delete this page? This cannot be undone.';
-
-            if (!confirm(message)) {
-                return;
-            }
-
             try {
                 contentPageEditLog.info('Deleting page:', this.pageId);