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/flex/flex-block/component.js

@@ -0,0 +1,47 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = exports.FlexBlock = void 0;
+var _react = require("react");
+var _context = require("../../context");
+var _view = require("../../view");
+var _hook = require("./hook");
+/**
+ * External dependencies
+ */
+
+/**
+ * Internal dependencies
+ */
+
+function UnconnectedFlexBlock(props, forwardedRef) {
+  const flexBlockProps = (0, _hook.useFlexBlock)(props);
+  return (0, _react.createElement)(_view.View, {
+    ...flexBlockProps,
+    ref: forwardedRef
+  });
+}
+
+/**
+ * `FlexBlock` is a primitive layout component that adaptively resizes content
+ * within layout containers like `Flex`.
+ *
+ * ```jsx
+ * import { Flex, FlexBlock } from '@wordpress/components';
+ *
+ * function Example() {
+ *   return (
+ *     <Flex>
+ *       <FlexBlock>...</FlexBlock>
+ *     </Flex>
+ *   );
+ * }
+ * ```
+ */
+const FlexBlock = (0, _context.contextConnect)(UnconnectedFlexBlock, 'FlexBlock');
+exports.FlexBlock = FlexBlock;
+var _default = FlexBlock;
+exports.default = _default;
+//# sourceMappingURL=component.js.map

node_modules/@wordpress/components/build/flex/flex-block/component.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["_context","require","_view","_hook","UnconnectedFlexBlock","props","forwardedRef","flexBlockProps","useFlexBlock","_react","createElement","View","ref","FlexBlock","contextConnect","exports","_default","default"],"sources":["@wordpress/components/src/flex/flex-block/component.tsx"],"sourcesContent":["/**\n * External dependencies\n */\nimport type { ForwardedRef } from 'react';\n\n/**\n * Internal dependencies\n */\nimport type { WordPressComponentProps } from '../../context';\nimport { contextConnect } from '../../context';\nimport { View } from '../../view';\nimport type { FlexBlockProps } from '../types';\nimport { useFlexBlock } from './hook';\n\nfunction UnconnectedFlexBlock(\n\tprops: WordPressComponentProps< FlexBlockProps, 'div' >,\n\tforwardedRef: ForwardedRef< any >\n) {\n\tconst flexBlockProps = useFlexBlock( props );\n\n\treturn <View { ...flexBlockProps } ref={ forwardedRef } />;\n}\n\n/**\n * `FlexBlock` is a primitive layout component that adaptively resizes content\n * within layout containers like `Flex`.\n *\n * ```jsx\n * import { Flex, FlexBlock } from '@wordpress/components';\n *\n * function Example() {\n *   return (\n *     <Flex>\n *       <FlexBlock>...</FlexBlock>\n *     </Flex>\n *   );\n * }\n * ```\n */\nexport const FlexBlock = contextConnect( UnconnectedFlexBlock, 'FlexBlock' );\n\nexport default FlexBlock;\n"],"mappings":";;;;;;;AASA,IAAAA,QAAA,GAAAC,OAAA;AACA,IAAAC,KAAA,GAAAD,OAAA;AAEA,IAAAE,KAAA,GAAAF,OAAA;AAZA;AACA;AACA;;AAGA;AACA;AACA;;AAOA,SAASG,oBAAoBA,CAC5BC,KAAuD,EACvDC,YAAiC,EAChC;EACD,MAAMC,cAAc,GAAG,IAAAC,kBAAY,EAAEH,KAAM,CAAC;EAE5C,OAAO,IAAAI,MAAA,CAAAC,aAAA,EAACR,KAAA,CAAAS,IAAI;IAAA,GAAMJ,cAAc;IAAGK,GAAG,EAAGN;EAAc,CAAE,CAAC;AAC3D;;AAEA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACO,MAAMO,SAAS,GAAG,IAAAC,uBAAc,EAAEV,oBAAoB,EAAE,WAAY,CAAC;AAACW,OAAA,CAAAF,SAAA,GAAAA,SAAA;AAAA,IAAAG,QAAA,GAE9DH,SAAS;AAAAE,OAAA,CAAAE,OAAA,GAAAD,QAAA"}

node_modules/@wordpress/components/build/flex/flex-block/hook.js

@@ -0,0 +1,21 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.useFlexBlock = useFlexBlock;
+var _context = require("../../context");
+var _flexItem = require("../flex-item");
+/**
+ * Internal dependencies
+ */
+
+function useFlexBlock(props) {
+  const otherProps = (0, _context.useContextSystem)(props, 'FlexBlock');
+  const flexItemProps = (0, _flexItem.useFlexItem)({
+    isBlock: true,
+    ...otherProps
+  });
+  return flexItemProps;
+}
+//# sourceMappingURL=hook.js.map

node_modules/@wordpress/components/build/flex/flex-block/hook.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["_context","require","_flexItem","useFlexBlock","props","otherProps","useContextSystem","flexItemProps","useFlexItem","isBlock"],"sources":["@wordpress/components/src/flex/flex-block/hook.ts"],"sourcesContent":["/**\n * Internal dependencies\n */\nimport type { WordPressComponentProps } from '../../context';\nimport { useContextSystem } from '../../context';\nimport { useFlexItem } from '../flex-item';\nimport type { FlexBlockProps } from '../types';\n\nexport function useFlexBlock(\n\tprops: WordPressComponentProps< FlexBlockProps, 'div' >\n) {\n\tconst otherProps = useContextSystem( props, 'FlexBlock' );\n\tconst flexItemProps = useFlexItem( { isBlock: true, ...otherProps } );\n\n\treturn flexItemProps;\n}\n"],"mappings":";;;;;;AAIA,IAAAA,QAAA,GAAAC,OAAA;AACA,IAAAC,SAAA,GAAAD,OAAA;AALA;AACA;AACA;;AAMO,SAASE,YAAYA,CAC3BC,KAAuD,EACtD;EACD,MAAMC,UAAU,GAAG,IAAAC,yBAAgB,EAAEF,KAAK,EAAE,WAAY,CAAC;EACzD,MAAMG,aAAa,GAAG,IAAAC,qBAAW,EAAE;IAAEC,OAAO,EAAE,IAAI;IAAE,GAAGJ;EAAW,CAAE,CAAC;EAErE,OAAOE,aAAa;AACrB"}

node_modules/@wordpress/components/build/flex/flex-block/index.js

@@ -0,0 +1,21 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "default", {
+  enumerable: true,
+  get: function () {
+    return _component.default;
+  }
+});
+Object.defineProperty(exports, "useFlexBlock", {
+  enumerable: true,
+  get: function () {
+    return _hook.useFlexBlock;
+  }
+});
+var _component = _interopRequireDefault(require("./component"));
+var _hook = require("./hook");
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/components/build/flex/flex-block/index.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["_component","_interopRequireDefault","require","_hook"],"sources":["@wordpress/components/src/flex/flex-block/index.ts"],"sourcesContent":["export { default } from './component';\nexport { useFlexBlock } from './hook';\n"],"mappings":";;;;;;;;;;;;;;;;;;AAAA,IAAAA,UAAA,GAAAC,sBAAA,CAAAC,OAAA;AACA,IAAAC,KAAA,GAAAD,OAAA"}