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/input-control/label.js

@@ -0,0 +1,32 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = Label;
+var _react = require("react");
+var _visuallyHidden = require("../visually-hidden");
+var _inputControlStyles = require("./styles/input-control-styles");
+/**
+ * Internal dependencies
+ */
+
+function Label({
+  children,
+  hideLabelFromVision,
+  htmlFor,
+  ...props
+}) {
+  if (!children) return null;
+  if (hideLabelFromVision) {
+    return (0, _react.createElement)(_visuallyHidden.VisuallyHidden, {
+      as: "label",
+      htmlFor: htmlFor
+    }, children);
+  }
+  return (0, _react.createElement)(_inputControlStyles.LabelWrapper, null, (0, _react.createElement)(_inputControlStyles.Label, {
+    htmlFor: htmlFor,
+    ...props
+  }, children));
+}
+//# sourceMappingURL=label.js.map