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-icon/component.js

@@ -0,0 +1,71 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = exports.ToggleGroupControlOptionIcon = void 0;
+var _react = require("react");
+var _element = require("@wordpress/element");
+var _toggleGroupControlOptionBase = require("../toggle-group-control-option-base");
+var _icon = _interopRequireDefault(require("../../icon"));
+/**
+ * External dependencies
+ */
+
+/**
+ * WordPress dependencies
+ */
+
+function UnforwardedToggleGroupControlOptionIcon(props, ref) {
+  const {
+    icon,
+    label,
+    ...restProps
+  } = props;
+  return (0, _react.createElement)(_toggleGroupControlOptionBase.ToggleGroupControlOptionBase, {
+    ...restProps,
+    isIcon: true,
+    "aria-label": label,
+    showTooltip: true,
+    ref: ref
+  }, (0, _react.createElement)(_icon.default, {
+    icon: icon
+  }));
+}
+
+/**
+ * `ToggleGroupControlOptionIcon` is a form component which is meant to be used as a
+ * child of `ToggleGroupControl` and displays an icon.
+ *
+ * ```jsx
+ *
+ * import {
+ *	__experimentalToggleGroupControl as ToggleGroupControl,
+ *	__experimentalToggleGroupControlOptionIcon as ToggleGroupControlOptionIcon,
+ * from '@wordpress/components';
+ * import { formatLowercase, formatUppercase } from '@wordpress/icons';
+ *
+ * function Example() {
+ *	return (
+ *		<ToggleGroupControl>
+ *			<ToggleGroupControlOptionIcon
+ *				value="uppercase"
+ *				label="Uppercase"
+ *				icon={ formatUppercase }
+ *			/>
+ *			<ToggleGroupControlOptionIcon
+ *				value="lowercase"
+ *				label="Lowercase"
+ *				icon={ formatLowercase }
+ *			/>
+ *		</ToggleGroupControl>
+ *	);
+ * }
+ * ```
+ */
+const ToggleGroupControlOptionIcon = (0, _element.forwardRef)(UnforwardedToggleGroupControlOptionIcon);
+exports.ToggleGroupControlOptionIcon = ToggleGroupControlOptionIcon;
+var _default = ToggleGroupControlOptionIcon;
+exports.default = _default;
+//# sourceMappingURL=component.js.map

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

@@ -0,0 +1 @@
+{"version":3,"names":["_element","require","_toggleGroupControlOptionBase","_icon","_interopRequireDefault","UnforwardedToggleGroupControlOptionIcon","props","ref","icon","label","restProps","_react","createElement","ToggleGroupControlOptionBase","isIcon","showTooltip","default","ToggleGroupControlOptionIcon","forwardRef","exports","_default"],"sources":["@wordpress/components/src/toggle-group-control/toggle-group-control-option-icon/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 { ToggleGroupControlOptionIconProps } from '../types';\nimport { ToggleGroupControlOptionBase } from '../toggle-group-control-option-base';\nimport Icon from '../../icon';\n\nfunction UnforwardedToggleGroupControlOptionIcon(\n\tprops: WordPressComponentProps<\n\t\tToggleGroupControlOptionIconProps,\n\t\t'button',\n\t\tfalse\n\t>,\n\tref: ForwardedRef< any >\n) {\n\tconst { icon, label, ...restProps } = props;\n\treturn (\n\t\t<ToggleGroupControlOptionBase\n\t\t\t{ ...restProps }\n\t\t\tisIcon\n\t\t\taria-label={ label }\n\t\t\tshowTooltip\n\t\t\tref={ ref }\n\t\t>\n\t\t\t<Icon icon={ icon } />\n\t\t</ToggleGroupControlOptionBase>\n\t);\n}\n\n/**\n * `ToggleGroupControlOptionIcon` is a form component which is meant to be used as a\n * child of `ToggleGroupControl` and displays an icon.\n *\n * ```jsx\n *\n * import {\n *\t__experimentalToggleGroupControl as ToggleGroupControl,\n *\t__experimentalToggleGroupControlOptionIcon as ToggleGroupControlOptionIcon,\n * from '@wordpress/components';\n * import { formatLowercase, formatUppercase } from '@wordpress/icons';\n *\n * function Example() {\n *\treturn (\n *\t\t<ToggleGroupControl>\n *\t\t\t<ToggleGroupControlOptionIcon\n *\t\t\t\tvalue=\"uppercase\"\n *\t\t\t\tlabel=\"Uppercase\"\n *\t\t\t\ticon={ formatUppercase }\n *\t\t\t/>\n *\t\t\t<ToggleGroupControlOptionIcon\n *\t\t\t\tvalue=\"lowercase\"\n *\t\t\t\tlabel=\"Lowercase\"\n *\t\t\t\ticon={ formatLowercase }\n *\t\t\t/>\n *\t\t</ToggleGroupControl>\n *\t);\n * }\n * ```\n */\nexport const ToggleGroupControlOptionIcon = forwardRef(\n\tUnforwardedToggleGroupControlOptionIcon\n);\n\nexport default ToggleGroupControlOptionIcon;\n"],"mappings":";;;;;;;;AAQA,IAAAA,QAAA,GAAAC,OAAA;AAOA,IAAAC,6BAAA,GAAAD,OAAA;AACA,IAAAE,KAAA,GAAAC,sBAAA,CAAAH,OAAA;AAhBA;AACA;AACA;;AAGA;AACA;AACA;;AAWA,SAASI,uCAAuCA,CAC/CC,KAIC,EACDC,GAAwB,EACvB;EACD,MAAM;IAAEC,IAAI;IAAEC,KAAK;IAAE,GAAGC;EAAU,CAAC,GAAGJ,KAAK;EAC3C,OACC,IAAAK,MAAA,CAAAC,aAAA,EAACV,6BAAA,CAAAW,4BAA4B;IAAA,GACvBH,SAAS;IACdI,MAAM;IACN,cAAaL,KAAO;IACpBM,WAAW;IACXR,GAAG,EAAGA;EAAK,GAEX,IAAAI,MAAA,CAAAC,aAAA,EAACT,KAAA,CAAAa,OAAI;IAACR,IAAI,EAAGA;EAAM,CAAE,CACQ,CAAC;AAEjC;;AAEA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACO,MAAMS,4BAA4B,GAAG,IAAAC,mBAAU,EACrDb,uCACD,CAAC;AAACc,OAAA,CAAAF,4BAAA,GAAAA,4BAAA;AAAA,IAAAG,QAAA,GAEaH,4BAA4B;AAAAE,OAAA,CAAAH,OAAA,GAAAI,QAAA"}

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

@@ -0,0 +1,14 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "ToggleGroupControlOptionIcon", {
+  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-icon/index.js.map

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