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/components/async-mode-provider/context.js

@@ -0,0 +1,55 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = exports.Context = exports.AsyncModeConsumer = void 0;
+var _element = require("@wordpress/element");
+/**
+ * WordPress dependencies
+ */
+
+const Context = exports.Context = (0, _element.createContext)(false);
+const {
+  Consumer,
+  Provider
+} = Context;
+const AsyncModeConsumer = exports.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.
+ */
+var _default = exports.default = Provider;
+//# sourceMappingURL=context.js.map

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

@@ -0,0 +1 @@
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node_modules/@wordpress/data/build/components/async-mode-provider/index.js

@@ -0,0 +1,29 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "AsyncModeConsumer", {
+  enumerable: true,
+  get: function () {
+    return _context.AsyncModeConsumer;
+  }
+});
+Object.defineProperty(exports, "AsyncModeProvider", {
+  enumerable: true,
+  get: function () {
+    return _context.default;
+  }
+});
+Object.defineProperty(exports, "useAsyncMode", {
+  enumerable: true,
+  get: function () {
+    return _useAsyncMode.default;
+  }
+});
+var _useAsyncMode = _interopRequireDefault(require("./use-async-mode"));
+var _context = _interopRequireWildcard(require("./context"));
+function _getRequireWildcardCache(e) { if ("function" != typeof WeakMap) return null; var r = new WeakMap(), t = new WeakMap(); return (_getRequireWildcardCache = function (e) { return e ? t : r; })(e); }
+function _interopRequireWildcard(e, r) { if (!r && e && e.__esModule) return e; if (null === e || "object" != typeof e && "function" != typeof e) return { default: e }; var t = _getRequireWildcardCache(r); if (t && t.has(e)) return t.get(e); var n = { __proto__: null }, a = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var u in e) if ("default" !== u && {}.hasOwnProperty.call(e, u)) { var i = a ? Object.getOwnPropertyDescriptor(e, u) : null; i && (i.get || i.set) ? Object.defineProperty(n, u, i) : n[u] = e[u]; } return n.default = e, t && t.set(e, n), n; }
+//# sourceMappingURL=index.js.map

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

@@ -0,0 +1 @@
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node_modules/@wordpress/data/build/components/async-mode-provider/use-async-mode.js

@@ -0,0 +1,20 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = useAsyncMode;
+var _element = require("@wordpress/element");
+var _context = require("./context");
+/**
+ * WordPress dependencies
+ */
+
+/**
+ * Internal dependencies
+ */
+
+function useAsyncMode() {
+  return (0, _element.useContext)(_context.Context);
+}
+//# sourceMappingURL=use-async-mode.js.map

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

@@ -0,0 +1 @@
+{"version":3,"names":["_element","require","_context","useAsyncMode","useContext","Context"],"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":";;;;;;AAGA,IAAAA,QAAA,GAAAC,OAAA;AAKA,IAAAC,QAAA,GAAAD,OAAA;AARA;AACA;AACA;;AAGA;AACA;AACA;;AAGe,SAASE,YAAYA,CAAA,EAAG;EACtC,OAAO,IAAAC,mBAAU,EAAEC,gBAAQ,CAAC;AAC7B","ignoreList":[]}