fix: prevent asset conflicts between React and Grid.js versions

Add coexistence checks to all enqueue methods to prevent loading
both React and Grid.js assets simultaneously.

Changes:
- ReactAdmin.php: Only enqueue React assets when ?react=1
- Init.php: Skip Grid.js when React active on admin pages
- Form.php, Coupon.php, Access.php: Restore classic assets when ?react=0
- Customer.php, Product.php, License.php: Add coexistence checks

Now the toggle between Classic and React versions works correctly.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

node_modules/@ariakit/react/esm/__chunks/P3XY2YBH.js

@@ -0,0 +1,16 @@
+"use client";
+
+// src/collection.ts
+import { useCollectionStore } from "@ariakit/react-core/collection/collection-store";
+import { useCollectionContext } from "@ariakit/react-core/collection/collection-context";
+import { Collection } from "@ariakit/react-core/collection/collection";
+import { CollectionProvider } from "@ariakit/react-core/collection/collection-provider";
+import { CollectionItem } from "@ariakit/react-core/collection/collection-item";
+
+export {
+  useCollectionStore,
+  useCollectionContext,
+  Collection,
+  CollectionProvider,
+  CollectionItem
+};