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/compose/build-module/hooks/use-copy-to-clipboard/index.js

@@ -0,0 +1,65 @@
+/**
+ * External dependencies
+ */
+import Clipboard from 'clipboard';
+
+/**
+ * WordPress dependencies
+ */
+import { useRef } from '@wordpress/element';
+
+/**
+ * Internal dependencies
+ */
+import useRefEffect from '../use-ref-effect';
+
+/**
+ * @template T
+ * @param {T} value
+ * @return {import('react').RefObject<T>} The updated ref
+ */
+function useUpdatedRef(value) {
+  const ref = useRef(value);
+  ref.current = value;
+  return ref;
+}
+
+/**
+ * Copies the given text to the clipboard when the element is clicked.
+ *
+ * @template {HTMLElement} TElementType
+ * @param {string | (() => string)} text      The text to copy. Use a function if not
+ *                                            already available and expensive to compute.
+ * @param {Function}                onSuccess Called when to text is copied.
+ *
+ * @return {import('react').Ref<TElementType>} A ref to assign to the target element.
+ */
+export default function useCopyToClipboard(text, onSuccess) {
+  // Store the dependencies as refs and continuously update them so they're
+  // fresh when the callback is called.
+  const textRef = useUpdatedRef(text);
+  const onSuccessRef = useUpdatedRef(onSuccess);
+  return useRefEffect(node => {
+    // Clipboard listens to click events.
+    const clipboard = new Clipboard(node, {
+      text() {
+        return typeof textRef.current === 'function' ? textRef.current() : textRef.current || '';
+      }
+    });
+    clipboard.on('success', ({
+      clearSelection
+    }) => {
+      // Clearing selection will move focus back to the triggering
+      // button, ensuring that it is not reset to the body, and
+      // further that it is kept within the rendered node.
+      clearSelection();
+      if (onSuccessRef.current) {
+        onSuccessRef.current();
+      }
+    });
+    return () => {
+      clipboard.destroy();
+    };
+  }, []);
+}
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/compose/build-module/hooks/use-copy-to-clipboard/index.js.map

@@ -0,0 +1 @@
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