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/text-highlight/index.js

@@ -0,0 +1,41 @@
+import { createElement, Fragment } from "react";
+/**
+ * WordPress dependencies
+ */
+import { createInterpolateElement } from '@wordpress/element';
+
+/**
+ * Internal dependencies
+ */
+import { escapeRegExp } from '../utils/strings';
+/**
+ * Highlights occurrences of a given string within another string of text. Wraps
+ * each match with a `<mark>` tag which provides browser default styling.
+ *
+ * ```jsx
+ * import { TextHighlight } from '@wordpress/components';
+ *
+ * const MyTextHighlight = () => (
+ *   <TextHighlight
+ *     text="Why do we like Gutenberg? Because Gutenberg is the best!"
+ *     highlight="Gutenberg"
+ *   />
+ * );
+ * ```
+ */
+export const TextHighlight = props => {
+  const {
+    text = '',
+    highlight = ''
+  } = props;
+  const trimmedHighlightText = highlight.trim();
+  if (!trimmedHighlightText) {
+    return createElement(Fragment, null, text);
+  }
+  const regex = new RegExp(`(${escapeRegExp(trimmedHighlightText)})`, 'gi');
+  return createInterpolateElement(text.replace(regex, '<mark>$&</mark>'), {
+    mark: createElement("mark", null)
+  });
+};
+export default TextHighlight;
+//# sourceMappingURL=index.js.map