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/toggle-group-control/toggle-group-control-option/component.js

@@ -0,0 +1,55 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = exports.ToggleGroupControlOption = void 0;
+var _react = require("react");
+var _element = require("@wordpress/element");
+var _toggleGroupControlOptionBase = require("../toggle-group-control-option-base");
+/**
+ * External dependencies
+ */
+
+/**
+ * WordPress dependencies
+ */
+
+function UnforwardedToggleGroupControlOption(props, ref) {
+  const {
+    label,
+    ...restProps
+  } = props;
+  const optionLabel = restProps['aria-label'] || label;
+  return (0, _react.createElement)(_toggleGroupControlOptionBase.ToggleGroupControlOptionBase, {
+    ...restProps,
+    "aria-label": optionLabel,
+    ref: ref
+  }, label);
+}
+
+/**
+ * `ToggleGroupControlOption` is a form component and is meant to be used as a
+ * child of `ToggleGroupControl`.
+ *
+ * ```jsx
+ * import {
+ *   __experimentalToggleGroupControl as ToggleGroupControl,
+ *   __experimentalToggleGroupControlOption as ToggleGroupControlOption,
+ * } from '@wordpress/components';
+ *
+ * function Example() {
+ *   return (
+ *     <ToggleGroupControl label="my label" value="vertical" isBlock>
+ *       <ToggleGroupControlOption value="horizontal" label="Horizontal" />
+ *       <ToggleGroupControlOption value="vertical" label="Vertical" />
+ *     </ToggleGroupControl>
+ *   );
+ * }
+ * ```
+ */
+const ToggleGroupControlOption = (0, _element.forwardRef)(UnforwardedToggleGroupControlOption);
+exports.ToggleGroupControlOption = ToggleGroupControlOption;
+var _default = ToggleGroupControlOption;
+exports.default = _default;
+//# sourceMappingURL=component.js.map

node_modules/@wordpress/components/build/toggle-group-control/toggle-group-control-option/component.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["_element","require","_toggleGroupControlOptionBase","UnforwardedToggleGroupControlOption","props","ref","label","restProps","optionLabel","_react","createElement","ToggleGroupControlOptionBase","ToggleGroupControlOption","forwardRef","exports","_default","default"],"sources":["@wordpress/components/src/toggle-group-control/toggle-group-control-option/component.tsx"],"sourcesContent":["/**\n * External dependencies\n */\nimport type { ForwardedRef } from 'react';\n\n/**\n * WordPress dependencies\n */\nimport { forwardRef } from '@wordpress/element';\n\n/**\n * Internal dependencies\n */\nimport type { WordPressComponentProps } from '../../context';\nimport type { ToggleGroupControlOptionProps } from '../types';\nimport { ToggleGroupControlOptionBase } from '../toggle-group-control-option-base';\n\nfunction UnforwardedToggleGroupControlOption(\n\tprops: WordPressComponentProps<\n\t\tToggleGroupControlOptionProps,\n\t\t'button',\n\t\tfalse\n\t>,\n\tref: ForwardedRef< any >\n) {\n\tconst { label, ...restProps } = props;\n\tconst optionLabel = restProps[ 'aria-label' ] || label;\n\treturn (\n\t\t<ToggleGroupControlOptionBase\n\t\t\t{ ...restProps }\n\t\t\taria-label={ optionLabel }\n\t\t\tref={ ref }\n\t\t>\n\t\t\t{ label }\n\t\t</ToggleGroupControlOptionBase>\n\t);\n}\n\n/**\n * `ToggleGroupControlOption` is a form component and is meant to be used as a\n * child of `ToggleGroupControl`.\n *\n * ```jsx\n * import {\n *   __experimentalToggleGroupControl as ToggleGroupControl,\n *   __experimentalToggleGroupControlOption as ToggleGroupControlOption,\n * } from '@wordpress/components';\n *\n * function Example() {\n *   return (\n *     <ToggleGroupControl label=\"my label\" value=\"vertical\" isBlock>\n *       <ToggleGroupControlOption value=\"horizontal\" label=\"Horizontal\" />\n *       <ToggleGroupControlOption value=\"vertical\" label=\"Vertical\" />\n *     </ToggleGroupControl>\n *   );\n * }\n * ```\n */\nexport const ToggleGroupControlOption = forwardRef(\n\tUnforwardedToggleGroupControlOption\n);\n\nexport default ToggleGroupControlOption;\n"],"mappings":";;;;;;;AAQA,IAAAA,QAAA,GAAAC,OAAA;AAOA,IAAAC,6BAAA,GAAAD,OAAA;AAfA;AACA;AACA;;AAGA;AACA;AACA;;AAUA,SAASE,mCAAmCA,CAC3CC,KAIC,EACDC,GAAwB,EACvB;EACD,MAAM;IAAEC,KAAK;IAAE,GAAGC;EAAU,CAAC,GAAGH,KAAK;EACrC,MAAMI,WAAW,GAAGD,SAAS,CAAE,YAAY,CAAE,IAAID,KAAK;EACtD,OACC,IAAAG,MAAA,CAAAC,aAAA,EAACR,6BAAA,CAAAS,4BAA4B;IAAA,GACvBJ,SAAS;IACd,cAAaC,WAAa;IAC1BH,GAAG,EAAGA;EAAK,GAETC,KAC2B,CAAC;AAEjC;;AAEA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACO,MAAMM,wBAAwB,GAAG,IAAAC,mBAAU,EACjDV,mCACD,CAAC;AAACW,OAAA,CAAAF,wBAAA,GAAAA,wBAAA;AAAA,IAAAG,QAAA,GAEaH,wBAAwB;AAAAE,OAAA,CAAAE,OAAA,GAAAD,QAAA"}

node_modules/@wordpress/components/build/toggle-group-control/toggle-group-control-option/index.js

@@ -0,0 +1,14 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "ToggleGroupControlOption", {
+  enumerable: true,
+  get: function () {
+    return _component.default;
+  }
+});
+var _component = _interopRequireDefault(require("./component"));
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/components/build/toggle-group-control/toggle-group-control-option/index.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["_component","_interopRequireDefault","require"],"sources":["@wordpress/components/src/toggle-group-control/toggle-group-control-option/index.ts"],"sourcesContent":["export { default as ToggleGroupControlOption } from './component';\n"],"mappings":";;;;;;;;;;;;AAAA,IAAAA,UAAA,GAAAC,sBAAA,CAAAC,OAAA"}