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/tenancy/static/admin/js/admin-users.js

@@ -17,6 +17,9 @@ function adminUsersPage() {
         loading: false,
         error: null,
         currentUserId: null,
+        showDeleteModal: false,
+        showDeleteFinalModal: false,
+        adminToDelete: null,
         filters: {
             search: '',
             is_super_admin: '',
@@ -286,6 +289,12 @@ function adminUsersPage() {
             window.location.href = `/admin/admin-users/${admin.id}/edit`;
         },
 
+        // Intermediate step for double-confirm delete
+        confirmDeleteStep() {
+            adminUsersLog.info('First delete confirmation accepted, showing final confirmation');
+            this.showDeleteFinalModal = true;
+        },
+
         async deleteAdminUser(admin) {
             adminUsersLog.warn('Delete admin user requested:', admin.username);
 
@@ -295,17 +304,6 @@ function adminUsersPage() {
                 return;
             }
 
-            if (!confirm(`Are you sure you want to delete admin user "${admin.username}"?\n\nThis action cannot be undone.`)) {
-                adminUsersLog.info('Delete cancelled by user');
-                return;
-            }
-
-            // Second confirmation for safety
-            if (!confirm(`FINAL CONFIRMATION\n\nAre you absolutely sure you want to delete "${admin.username}"?`)) {
-                adminUsersLog.info('Delete cancelled by user (second confirmation)');
-                return;
-            }
-
             try {
                 const url = `/admin/admin-users/${admin.id}`;
                 window.LogConfig.logApiCall('DELETE', url, null, 'request');