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-dialog/index.js

@@ -0,0 +1,66 @@
+/**
+ * External dependencies
+ */
+
+/**
+ * WordPress dependencies
+ */
+import { useRef, useEffect, useCallback } from '@wordpress/element';
+import { ESCAPE } from '@wordpress/keycodes';
+
+/**
+ * Internal dependencies
+ */
+import useConstrainedTabbing from '../use-constrained-tabbing';
+import useFocusOnMount from '../use-focus-on-mount';
+import useFocusReturn from '../use-focus-return';
+import useFocusOutside from '../use-focus-outside';
+import useMergeRefs from '../use-merge-refs';
+/**
+ * Returns a ref and props to apply to a dialog wrapper to enable the following behaviors:
+ *  - constrained tabbing.
+ *  - focus on mount.
+ *  - return focus on unmount.
+ *  - focus outside.
+ *
+ * @param options Dialog Options.
+ */
+function useDialog(options) {
+  const currentOptions = useRef();
+  const {
+    constrainTabbing = options.focusOnMount !== false
+  } = options;
+  useEffect(() => {
+    currentOptions.current = options;
+  }, Object.values(options));
+  const constrainedTabbingRef = useConstrainedTabbing();
+  const focusOnMountRef = useFocusOnMount(options.focusOnMount);
+  const focusReturnRef = useFocusReturn();
+  const focusOutsideProps = useFocusOutside(event => {
+    // This unstable prop  is here only to manage backward compatibility
+    // for the Popover component otherwise, the onClose should be enough.
+    if (currentOptions.current?.__unstableOnClose) {
+      currentOptions.current.__unstableOnClose('focus-outside', event);
+    } else if (currentOptions.current?.onClose) {
+      currentOptions.current.onClose();
+    }
+  });
+  const closeOnEscapeRef = useCallback(node => {
+    if (!node) {
+      return;
+    }
+    node.addEventListener('keydown', event => {
+      // Close on escape.
+      if (event.keyCode === ESCAPE && !event.defaultPrevented && currentOptions.current?.onClose) {
+        event.preventDefault();
+        currentOptions.current.onClose();
+      }
+    });
+  }, []);
+  return [useMergeRefs([constrainTabbing ? constrainedTabbingRef : null, options.focusOnMount !== false ? focusReturnRef : null, options.focusOnMount !== false ? focusOnMountRef : null, closeOnEscapeRef]), {
+    ...focusOutsideProps,
+    tabIndex: -1
+  }];
+}
+export default useDialog;
+//# sourceMappingURL=index.js.map