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/toolbar/toolbar-item/index.js

@@ -0,0 +1,52 @@
+import { createElement } from "react";
+/**
+ * External dependencies
+ */
+// eslint-disable-next-line no-restricted-imports
+import * as Ariakit from '@ariakit/react';
+/**
+ * WordPress dependencies
+ */
+import { forwardRef, useContext } from '@wordpress/element';
+import warning from '@wordpress/warning';
+
+/**
+ * Internal dependencies
+ */
+import ToolbarContext from '../toolbar-context';
+function ToolbarItem({
+  children,
+  as: Component,
+  ...props
+}, ref) {
+  const accessibleToolbarStore = useContext(ToolbarContext);
+  const isRenderProp = typeof children === 'function';
+  if (!isRenderProp && !Component) {
+    typeof SCRIPT_DEBUG !== "undefined" && SCRIPT_DEBUG === true ? warning('`ToolbarItem` is a generic headless component. You must pass either a `children` prop as a function or an `as` prop as a component. ' + 'See https://developer.wordpress.org/block-editor/components/toolbar-item/') : void 0;
+    return null;
+  }
+  const allProps = {
+    ...props,
+    ref,
+    'data-toolbar-item': true
+  };
+  if (!accessibleToolbarStore) {
+    if (Component) {
+      return createElement(Component, {
+        ...allProps
+      }, children);
+    }
+    if (!isRenderProp) {
+      return null;
+    }
+    return children(allProps);
+  }
+  const render = isRenderProp ? children : Component && createElement(Component, null, children);
+  return createElement(Ariakit.ToolbarItem, {
+    ...allProps,
+    store: accessibleToolbarStore,
+    render: render
+  });
+}
+export default forwardRef(ToolbarItem);
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/components/build-module/toolbar/toolbar-item/index.js.map

@@ -0,0 +1 @@
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node_modules/@wordpress/components/build-module/toolbar/toolbar-item/index.native.js

@@ -0,0 +1,20 @@
+/**
+ * WordPress dependencies
+ */
+import { forwardRef } from '@wordpress/element';
+import warning from '@wordpress/warning';
+function ToolbarItem({
+  children,
+  ...props
+}, ref) {
+  if (typeof children !== 'function') {
+    typeof SCRIPT_DEBUG !== "undefined" && SCRIPT_DEBUG === true ? warning('`ToolbarItem` is a generic headless component that accepts only function children props') : void 0;
+    return null;
+  }
+  return children({
+    ...props,
+    ref
+  });
+}
+export default forwardRef(ToolbarItem);
+//# sourceMappingURL=index.native.js.map

node_modules/@wordpress/components/build-module/toolbar/toolbar-item/index.native.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["forwardRef","warning","ToolbarItem","children","props","ref","SCRIPT_DEBUG"],"sources":["@wordpress/components/src/toolbar/toolbar-item/index.native.js"],"sourcesContent":["/**\n * WordPress dependencies\n */\nimport { forwardRef } from '@wordpress/element';\nimport warning from '@wordpress/warning';\n\nfunction ToolbarItem( { children, ...props }, ref ) {\n\tif ( typeof children !== 'function' ) {\n\t\twarning(\n\t\t\t'`ToolbarItem` is a generic headless component that accepts only function children props'\n\t\t);\n\t\treturn null;\n\t}\n\treturn children( { ...props, ref } );\n}\n\nexport default forwardRef( ToolbarItem );\n"],"mappings":"AAAA;AACA;AACA;AACA,SAASA,UAAU,QAAQ,oBAAoB;AAC/C,OAAOC,OAAO,MAAM,oBAAoB;AAExC,SAASC,WAAWA,CAAE;EAAEC,QAAQ;EAAE,GAAGC;AAAM,CAAC,EAAEC,GAAG,EAAG;EACnD,IAAK,OAAOF,QAAQ,KAAK,UAAU,EAAG;IACrC,OAAAG,YAAA,oBAAAA,YAAA,YAAAL,OAAO,CACN,yFACD,CAAC;IACD,OAAO,IAAI;EACZ;EACA,OAAOE,QAAQ,CAAE;IAAE,GAAGC,KAAK;IAAEC;EAAI,CAAE,CAAC;AACrC;AAEA,eAAeL,UAAU,CAAEE,WAAY,CAAC"}

node_modules/@wordpress/components/build-module/toolbar/toolbar-item/types.js

@@ -0,0 +1,2 @@
+export {};
+//# sourceMappingURL=types.js.map

node_modules/@wordpress/components/build-module/toolbar/toolbar-item/types.js.map

@@ -0,0 +1 @@
+{"version":3,"names":[],"sources":["@wordpress/components/src/toolbar/toolbar-item/types.ts"],"sourcesContent":["/**\n * External dependencies\n */\nimport type {\n\tReactElement,\n\tReactNode,\n\tElementType,\n\tHTMLAttributes,\n\tRefAttributes,\n} from 'react';\n\nexport type ToolbarItemProps = Omit< HTMLAttributes< any >, 'children' > & {\n\t/**\n\t * Component type that will be used to render the toolbar item.\n\t */\n\tas?: ElementType;\n\t/**\n\t * A function that receives the props that should be spread onto the element\n\t * that will be rendered as a toolbar item. If the `as` prop is not provided,\n\t * this prop will accept a ReactNode instead.\n\t */\n\tchildren?:\n\t\t| ReactNode\n\t\t| ( (\n\t\t\t\tprops: HTMLAttributes< any > & RefAttributes< any >\n\t\t  ) => ReactElement | null );\n};\n"],"mappings":""}