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/scrollable/hook.js

@@ -0,0 +1,27 @@
+/**
+ * WordPress dependencies
+ */
+import { useMemo } from '@wordpress/element';
+
+/**
+ * Internal dependencies
+ */
+
+import { useContextSystem } from '../context';
+import * as styles from './styles';
+import { useCx } from '../utils/hooks/use-cx';
+export function useScrollable(props) {
+  const {
+    className,
+    scrollDirection = 'y',
+    smoothScroll = false,
+    ...otherProps
+  } = useContextSystem(props, 'Scrollable');
+  const cx = useCx();
+  const classes = useMemo(() => cx(styles.Scrollable, styles.scrollableScrollbar, smoothScroll && styles.smoothScroll, scrollDirection === 'x' && styles.scrollX, scrollDirection === 'y' && styles.scrollY, scrollDirection === 'auto' && styles.scrollAuto, className), [className, cx, scrollDirection, smoothScroll]);
+  return {
+    ...otherProps,
+    className: classes
+  };
+}
+//# sourceMappingURL=hook.js.map