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/customers/static/admin/js/customers.js

@@ -52,6 +52,10 @@ function adminCustomers() {
         // Selected store (for prominent display and filtering)
         selectedStore: null,
 
+        // Toggle status confirm state
+        showToggleStatusConfirm: false,
+        pendingToggleCustomer: null,
+
         // Tom Select instance
         storeSelectInstance: null,
 
@@ -351,11 +355,6 @@ function adminCustomers() {
          * Toggle customer active status
          */
         async toggleStatus(customer) {
-            const action = customer.is_active ? 'deactivate' : 'activate';
-            if (!confirm(`Are you sure you want to ${action} this customer?`)) {
-                return;
-            }
-
             try {
                 const response = await apiClient.patch(`/admin/customers/${customer.id}/toggle-status`);
                 customer.is_active = response.is_active;