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/async-mode-provider/context.js

@@ -0,0 +1,48 @@
+/**
+ * WordPress dependencies
+ */
+import { createContext } from '@wordpress/element';
+export const Context = createContext(false);
+const {
+  Consumer,
+  Provider
+} = Context;
+export const AsyncModeConsumer = Consumer;
+
+/**
+ * Context Provider Component used to switch the data module component rerendering
+ * between Sync and Async modes.
+ *
+ * @example
+ *
+ * ```js
+ * import { useSelect, AsyncModeProvider } from '@wordpress/data';
+ * import { store as blockEditorStore } from '@wordpress/block-editor';
+ *
+ * function BlockCount() {
+ *   const count = useSelect( ( select ) => {
+ *     return select( blockEditorStore ).getBlockCount()
+ *   }, [] );
+ *
+ *   return count;
+ * }
+ *
+ * function App() {
+ *   return (
+ *     <AsyncModeProvider value={ true }>
+ *       <BlockCount />
+ *     </AsyncModeProvider>
+ *   );
+ * }
+ * ```
+ *
+ * In this example, the BlockCount component is rerendered asynchronously.
+ * It means if a more critical task is being performed (like typing in an input),
+ * the rerendering is delayed until the browser becomes IDLE.
+ * It is possible to nest multiple levels of AsyncModeProvider to fine-tune the rendering behavior.
+ *
+ * @param {boolean} props.value Enable Async Mode.
+ * @return {Component} The component to be rendered.
+ */
+export default Provider;
+//# sourceMappingURL=context.js.map

node_modules/@wordpress/data/build-module/components/async-mode-provider/context.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["createContext","Context","Consumer","Provider","AsyncModeConsumer"],"sources":["@wordpress/data/src/components/async-mode-provider/context.js"],"sourcesContent":["/**\n * WordPress dependencies\n */\nimport { createContext } from '@wordpress/element';\n\nexport const Context = createContext( false );\n\nconst { Consumer, Provider } = Context;\n\nexport const AsyncModeConsumer = Consumer;\n\n/**\n * Context Provider Component used to switch the data module component rerendering\n * between Sync and Async modes.\n *\n * @example\n *\n * ```js\n * import { useSelect, AsyncModeProvider } from '@wordpress/data';\n * import { store as blockEditorStore } from '@wordpress/block-editor';\n *\n * function BlockCount() {\n *   const count = useSelect( ( select ) => {\n *     return select( blockEditorStore ).getBlockCount()\n *   }, [] );\n *\n *   return count;\n * }\n *\n * function App() {\n *   return (\n *     <AsyncModeProvider value={ true }>\n *       <BlockCount />\n *     </AsyncModeProvider>\n *   );\n * }\n * ```\n *\n * In this example, the BlockCount component is rerendered asynchronously.\n * It means if a more critical task is being performed (like typing in an input),\n * the rerendering is delayed until the browser becomes IDLE.\n * It is possible to nest multiple levels of AsyncModeProvider to fine-tune the rendering behavior.\n *\n * @param {boolean} props.value Enable Async Mode.\n * @return {Component} The component to be rendered.\n */\nexport default Provider;\n"],"mappings":"AAAA;AACA;AACA;AACA,SAASA,aAAa,QAAQ,oBAAoB;AAElD,OAAO,MAAMC,OAAO,GAAGD,aAAa,CAAE,KAAM,CAAC;AAE7C,MAAM;EAAEE,QAAQ;EAAEC;AAAS,CAAC,GAAGF,OAAO;AAEtC,OAAO,MAAMG,iBAAiB,GAAGF,QAAQ;;AAEzC;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA,eAAeC,QAAQ","ignoreList":[]}

node_modules/@wordpress/data/build-module/components/async-mode-provider/index.js

@@ -0,0 +1,3 @@
+export { default as useAsyncMode } from './use-async-mode';
+export { default as AsyncModeProvider, AsyncModeConsumer } from './context';
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/data/build-module/components/async-mode-provider/index.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["default","useAsyncMode","AsyncModeProvider","AsyncModeConsumer"],"sources":["@wordpress/data/src/components/async-mode-provider/index.js"],"sourcesContent":["export { default as useAsyncMode } from './use-async-mode';\nexport { default as AsyncModeProvider, AsyncModeConsumer } from './context';\n"],"mappings":"AAAA,SAASA,OAAO,IAAIC,YAAY,QAAQ,kBAAkB;AAC1D,SAASD,OAAO,IAAIE,iBAAiB,EAAEC,iBAAiB,QAAQ,WAAW","ignoreList":[]}

node_modules/@wordpress/data/build-module/components/async-mode-provider/use-async-mode.js

@@ -0,0 +1,13 @@
+/**
+ * WordPress dependencies
+ */
+import { useContext } from '@wordpress/element';
+
+/**
+ * Internal dependencies
+ */
+import { Context } from './context';
+export default function useAsyncMode() {
+  return useContext(Context);
+}
+//# sourceMappingURL=use-async-mode.js.map

node_modules/@wordpress/data/build-module/components/async-mode-provider/use-async-mode.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["useContext","Context","useAsyncMode"],"sources":["@wordpress/data/src/components/async-mode-provider/use-async-mode.js"],"sourcesContent":["/**\n * WordPress dependencies\n */\nimport { useContext } from '@wordpress/element';\n\n/**\n * Internal dependencies\n */\nimport { Context } from './context';\n\nexport default function useAsyncMode() {\n\treturn useContext( Context );\n}\n"],"mappings":"AAAA;AACA;AACA;AACA,SAASA,UAAU,QAAQ,oBAAoB;;AAE/C;AACA;AACA;AACA,SAASC,OAAO,QAAQ,WAAW;AAEnC,eAAe,SAASC,YAAYA,CAAA,EAAG;EACtC,OAAOF,UAAU,CAAEC,OAAQ,CAAC;AAC7B","ignoreList":[]}