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/custom-gradient-picker/constants.js

@@ -0,0 +1,32 @@
+/**
+ * WordPress dependencies
+ */
+import { __ } from '@wordpress/i18n';
+export const DEFAULT_GRADIENT = 'linear-gradient(135deg, rgba(6, 147, 227, 1) 0%, rgb(155, 81, 224) 100%)';
+export const DEFAULT_LINEAR_GRADIENT_ANGLE = 180;
+export const HORIZONTAL_GRADIENT_ORIENTATION = {
+  type: 'angular',
+  value: '90'
+};
+export const GRADIENT_OPTIONS = [{
+  value: 'linear-gradient',
+  label: __('Linear')
+}, {
+  value: 'radial-gradient',
+  label: __('Radial')
+}];
+export const DIRECTIONAL_ORIENTATION_ANGLE_MAP = {
+  top: 0,
+  'top right': 45,
+  'right top': 45,
+  right: 90,
+  'right bottom': 135,
+  'bottom right': 135,
+  bottom: 180,
+  'bottom left': 225,
+  'left bottom': 225,
+  left: 270,
+  'top left': 315,
+  'left top': 315
+};
+//# sourceMappingURL=constants.js.map