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/@wordpress/components/build-module/footer-message-control/index.native.js

@@ -0,0 +1,18 @@
+import { createElement } from "react";
+/**
+ * WordPress dependencies
+ */
+import { memo } from '@wordpress/element';
+/**
+ * Internal dependencies
+ */
+import FooterMessageCell from '../mobile/bottom-sheet/footer-message-cell';
+function FooterMessageControl({
+  ...props
+}) {
+  return createElement(FooterMessageCell, {
+    ...props
+  });
+}
+export default memo(FooterMessageControl);
+//# sourceMappingURL=index.native.js.map

node_modules/@wordpress/components/build-module/footer-message-control/index.native.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["memo","FooterMessageCell","FooterMessageControl","props","createElement"],"sources":["@wordpress/components/src/footer-message-control/index.native.js"],"sourcesContent":["/**\n * WordPress dependencies\n */\nimport { memo } from '@wordpress/element';\n/**\n * Internal dependencies\n */\nimport FooterMessageCell from '../mobile/bottom-sheet/footer-message-cell';\n\nfunction FooterMessageControl( { ...props } ) {\n\treturn <FooterMessageCell { ...props } />;\n}\n\nexport default memo( FooterMessageControl );\n"],"mappings":";AAAA;AACA;AACA;AACA,SAASA,IAAI,QAAQ,oBAAoB;AACzC;AACA;AACA;AACA,OAAOC,iBAAiB,MAAM,4CAA4C;AAE1E,SAASC,oBAAoBA,CAAE;EAAE,GAAGC;AAAM,CAAC,EAAG;EAC7C,OAAOC,aAAA,CAACH,iBAAiB;IAAA,GAAME;EAAK,CAAI,CAAC;AAC1C;AAEA,eAAeH,IAAI,CAAEE,oBAAqB,CAAC"}