fix: React admin icon imports and mount point rendering

- Fix all @wordpress/icons imports - use build/ paths and call as functions
- Update all admin pages to render React mount points
- Components fixed: VariationPricingTable, NotificationLog, GlobalSettings,
  FormFieldOptions, OrderDetail, OrderListItem, OrderList, FormCanvas,
  AnalyticsDashboard, FormField, Products
- Admin pages updated: Order.php, Customer.php, Coupon.php, License.php,
  Product.php, Access.php, Form.php

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

includes/Order.php

@@ -642,12 +642,13 @@ class Order {
 
         // phpcs:ignore WordPress.Security.NonceVerification.Recommended
         $order_id = isset($_GET['order_id']) ? intval($_GET['order_id']) : 0;
-        if(empty($order_id)){
-            include FORMIPAY_PATH . 'admin/page-orders.php';
-        }else{
-            $order = formipay_get_order( $order_id );
-            include FORMIPAY_PATH . 'admin/page-order-details.php';
-        }
+        $page = $order_id ? 'order-detail' : 'orders';
+
+        // Render React mount point
+        printf(
+            '<div id="formipay-admin-root" data-formipay-mount="%s"></div>',
+            esc_attr($page)
+        );
 
     }