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/notifications.js

@@ -42,6 +42,10 @@ function storeNotifications() {
             is_read: ''
         },
 
+        // Delete notification confirm state
+        showDeleteNotificationConfirm: false,
+        pendingDeleteNotificationId: null,
+
         // Settings
         settings: null,
         showSettingsModal: false,
@@ -153,10 +157,6 @@ function storeNotifications() {
          * Delete notification
          */
         async deleteNotification(notificationId) {
-            if (!confirm(I18n.t('messaging.confirmations.delete_notification'))) {
-                return;
-            }
-
             try {
                 await apiClient.delete(`/store/notifications/${notificationId}`);