feat: rewrite DataTable + design system with shadcn/ui, replace SweetAlert2

- Rewrite DataTable using shadcn Table, Button, Dialog, Input, Select, Checkbox, Skeleton
- Replace all SweetAlert2 calls with shadcn Dialog (confirm) + sonner toast
- Rewrite design system internals to use shadcn Label, Input, Switch, Button, Alert, Badge, Tabs
- Add Toaster to App.js for global toast support
- Remove all @wordpress/components imports from DataTable
- Remove WpcftoDesign.css import from design system
- Replace Swal.fire() in Coupons, Products, Forms, Access, Licenses pages

build/admin.asset.php

@@ -1 +1 @@
-<?php return array('dependencies' => array('react', 'wp-components', 'wp-element', 'wp-i18n', 'wp-icons/build/arrow-left', 'wp-icons/build/bell', 'wp-icons/build/message', 'wp-icons/build/trash', 'wp-primitives'), 'version' => '9a1a0e2d03b8d775e648');
+<?php return array('dependencies' => array('react', 'react-dom', 'wp-components', 'wp-element', 'wp-i18n', 'wp-icons/build/arrow-left', 'wp-icons/build/bell', 'wp-icons/build/message', 'wp-icons/build/trash', 'wp-primitives'), 'version' => '6bf4643f2ea15ecdf0b7');