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/toggle-control/index.native.js

@@ -0,0 +1,32 @@
+import { createElement } from "react";
+/**
+ * WordPress dependencies
+ */
+import { memo } from '@wordpress/element';
+/**
+ * Internal dependencies
+ */
+import SwitchCell from '../mobile/bottom-sheet/switch-cell';
+const ToggleControl = memo(({
+  label,
+  checked,
+  help,
+  instanceId,
+  className,
+  onChange,
+  ...props
+}) => {
+  const id = `inspector-toggle-control-${instanceId}`;
+  const helpLabel = help && typeof help === 'function' ? help(checked) : help;
+  return createElement(SwitchCell, {
+    label: label,
+    id: id,
+    help: helpLabel,
+    className: className,
+    value: checked,
+    onValueChange: onChange,
+    ...props
+  });
+});
+export default ToggleControl;
+//# sourceMappingURL=index.native.js.map