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/data/build-module/components/with-registry/index.js

@@ -0,0 +1,25 @@
+import { createElement } from "react";
+/**
+ * WordPress dependencies
+ */
+import { createHigherOrderComponent } from '@wordpress/compose';
+
+/**
+ * Internal dependencies
+ */
+import { RegistryConsumer } from '../registry-provider';
+
+/**
+ * Higher-order component which renders the original component with the current
+ * registry context passed as its `registry` prop.
+ *
+ * @param {Component} OriginalComponent Original component.
+ *
+ * @return {Component} Enhanced component.
+ */
+const withRegistry = createHigherOrderComponent(OriginalComponent => props => createElement(RegistryConsumer, null, registry => createElement(OriginalComponent, {
+  ...props,
+  registry: registry
+})), 'withRegistry');
+export default withRegistry;
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/data/build-module/components/with-registry/index.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["createHigherOrderComponent","RegistryConsumer","withRegistry","OriginalComponent","props","createElement","registry"],"sources":["@wordpress/data/src/components/with-registry/index.js"],"sourcesContent":["/**\n * WordPress dependencies\n */\nimport { createHigherOrderComponent } from '@wordpress/compose';\n\n/**\n * Internal dependencies\n */\nimport { RegistryConsumer } from '../registry-provider';\n\n/**\n * Higher-order component which renders the original component with the current\n * registry context passed as its `registry` prop.\n *\n * @param {Component} OriginalComponent Original component.\n *\n * @return {Component} Enhanced component.\n */\nconst withRegistry = createHigherOrderComponent(\n\t( OriginalComponent ) => ( props ) => (\n\t\t<RegistryConsumer>\n\t\t\t{ ( registry ) => (\n\t\t\t\t<OriginalComponent { ...props } registry={ registry } />\n\t\t\t) }\n\t\t</RegistryConsumer>\n\t),\n\t'withRegistry'\n);\n\nexport default withRegistry;\n"],"mappings":";AAAA;AACA;AACA;AACA,SAASA,0BAA0B,QAAQ,oBAAoB;;AAE/D;AACA;AACA;AACA,SAASC,gBAAgB,QAAQ,sBAAsB;;AAEvD;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA,MAAMC,YAAY,GAAGF,0BAA0B,CAC5CG,iBAAiB,IAAQC,KAAK,IAC/BC,aAAA,CAACJ,gBAAgB,QACZK,QAAQ,IACXD,aAAA,CAACF,iBAAiB;EAAA,GAAMC,KAAK;EAAGE,QAAQ,EAAGA;AAAU,CAAE,CAEvC,CAClB,EACD,cACD,CAAC;AAED,eAAeJ,YAAY","ignoreList":[]}