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/menu-group/index.js

@@ -0,0 +1,59 @@
+import { createElement } from "react";
+/**
+ * External dependencies
+ */
+import classnames from 'classnames';
+
+/**
+ * WordPress dependencies
+ */
+import { Children } from '@wordpress/element';
+import { useInstanceId } from '@wordpress/compose';
+
+/**
+ * Internal dependencies
+ */
+
+/**
+ * `MenuGroup` wraps a series of related `MenuItem` components into a common
+ * section.
+ *
+ * ```jsx
+ * import { MenuGroup, MenuItem } from '@wordpress/components';
+ *
+ * const MyMenuGroup = () => (
+ *   <MenuGroup label="Settings">
+ *     <MenuItem>Setting 1</MenuItem>
+ *     <MenuItem>Setting 2</MenuItem>
+ *   </MenuGroup>
+ * );
+ * ```
+ */
+export function MenuGroup(props) {
+  const {
+    children,
+    className = '',
+    label,
+    hideSeparator
+  } = props;
+  const instanceId = useInstanceId(MenuGroup);
+  if (!Children.count(children)) {
+    return null;
+  }
+  const labelId = `components-menu-group-label-${instanceId}`;
+  const classNames = classnames(className, 'components-menu-group', {
+    'has-hidden-separator': hideSeparator
+  });
+  return createElement("div", {
+    className: classNames
+  }, label && createElement("div", {
+    className: "components-menu-group__label",
+    id: labelId,
+    "aria-hidden": "true"
+  }, label), createElement("div", {
+    role: "group",
+    "aria-labelledby": label ? labelId : undefined
+  }, children));
+}
+export default MenuGroup;
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/components/build-module/menu-group/index.js.map

@@ -0,0 +1 @@
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node_modules/@wordpress/components/build-module/menu-group/types.js

@@ -0,0 +1,2 @@
+export {};
+//# sourceMappingURL=types.js.map

node_modules/@wordpress/components/build-module/menu-group/types.js.map

@@ -0,0 +1 @@
+{"version":3,"names":[],"sources":["@wordpress/components/src/menu-group/types.ts"],"sourcesContent":["/**\n * External dependencies\n */\nimport type { ReactNode } from 'react';\n\nexport type MenuGroupProps = {\n\t/**\n\t * A CSS `class` to give to the container element.\n\t */\n\tclassName?: string;\n\t/**\n\t * Hide the top border on the container.\n\t */\n\thideSeparator?: boolean;\n\t/**\n\t * Text to be displayed as the menu group header.\n\t */\n\tlabel?: string;\n\t/**\n\t * The children elements.\n\t */\n\tchildren?: ReactNode;\n};\n"],"mappings":""}