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/custom-select-control/index.js

@@ -0,0 +1,201 @@
+import { createElement } from "react";
+// @ts-nocheck
+/**
+ * External dependencies
+ */
+import { useSelect } from 'downshift';
+import classnames from 'classnames';
+
+/**
+ * WordPress dependencies
+ */
+import { Icon, check } from '@wordpress/icons';
+import { __, sprintf } from '@wordpress/i18n';
+import { useCallback, useState } from '@wordpress/element';
+import deprecated from '@wordpress/deprecated';
+
+/**
+ * Internal dependencies
+ */
+import { VisuallyHidden } from '../visually-hidden';
+import { Select as SelectControlSelect } from '../select-control/styles/select-control-styles';
+import SelectControlChevronDown from '../select-control/chevron-down';
+import { InputBaseWithBackCompatMinWidth } from './styles';
+import { StyledLabel } from '../base-control/styles/base-control-styles';
+import { useDeprecated36pxDefaultSizeProp } from '../utils/use-deprecated-props';
+const itemToString = item => item?.name;
+// This is needed so that in Windows, where
+// the menu does not necessarily open on
+// key up/down, you can still switch between
+// options with the menu closed.
+const stateReducer = ({
+  selectedItem
+}, {
+  type,
+  changes,
+  props: {
+    items
+  }
+}) => {
+  switch (type) {
+    case useSelect.stateChangeTypes.ToggleButtonKeyDownArrowDown:
+      // If we already have a selected item, try to select the next one,
+      // without circular navigation. Otherwise, select the first item.
+      return {
+        selectedItem: items[selectedItem ? Math.min(items.indexOf(selectedItem) + 1, items.length - 1) : 0]
+      };
+    case useSelect.stateChangeTypes.ToggleButtonKeyDownArrowUp:
+      // If we already have a selected item, try to select the previous one,
+      // without circular navigation. Otherwise, select the last item.
+      return {
+        selectedItem: items[selectedItem ? Math.max(items.indexOf(selectedItem) - 1, 0) : items.length - 1]
+      };
+    default:
+      return changes;
+  }
+};
+export default function CustomSelectControl(props) {
+  const {
+    /** Start opting into the larger default height that will become the default size in a future version. */
+    __next40pxDefaultSize = false,
+    /** Start opting into the unconstrained width that will become the default in a future version. */
+    __nextUnconstrainedWidth = false,
+    className,
+    hideLabelFromVision,
+    label,
+    describedBy,
+    options: items,
+    onChange: onSelectedItemChange,
+    /** @type {import('../select-control/types').SelectControlProps.size} */
+    size = 'default',
+    value: _selectedItem,
+    onMouseOver,
+    onMouseOut,
+    onFocus,
+    onBlur,
+    __experimentalShowSelectedHint = false
+  } = useDeprecated36pxDefaultSizeProp(props, 'wp.components.CustomSelectControl', '6.4');
+  const {
+    getLabelProps,
+    getToggleButtonProps,
+    getMenuProps,
+    getItemProps,
+    isOpen,
+    highlightedIndex,
+    selectedItem
+  } = useSelect({
+    initialSelectedItem: items[0],
+    items,
+    itemToString,
+    onSelectedItemChange,
+    ...(typeof _selectedItem !== 'undefined' && _selectedItem !== null ? {
+      selectedItem: _selectedItem
+    } : undefined),
+    stateReducer
+  });
+  const [isFocused, setIsFocused] = useState(false);
+  function handleOnFocus(e) {
+    setIsFocused(true);
+    onFocus?.(e);
+  }
+  function handleOnBlur(e) {
+    setIsFocused(false);
+    onBlur?.(e);
+  }
+  if (!__nextUnconstrainedWidth) {
+    deprecated('Constrained width styles for wp.components.CustomSelectControl', {
+      since: '6.1',
+      version: '6.4',
+      hint: 'Set the `__nextUnconstrainedWidth` prop to true to start opting into the new styles, which will become the default in a future version'
+    });
+  }
+  function getDescribedBy() {
+    if (describedBy) {
+      return describedBy;
+    }
+    if (!selectedItem) {
+      return __('No selection');
+    }
+
+    // translators: %s: The selected option.
+    return sprintf(__('Currently selected: %s'), selectedItem.name);
+  }
+  const menuProps = getMenuProps({
+    className: 'components-custom-select-control__menu',
+    'aria-hidden': !isOpen
+  });
+  const onKeyDownHandler = useCallback(e => {
+    e.stopPropagation();
+    menuProps?.onKeyDown?.(e);
+  }, [menuProps]);
+
+  // We need this here, because the null active descendant is not fully ARIA compliant.
+  if (menuProps['aria-activedescendant']?.startsWith('downshift-null')) {
+    delete menuProps['aria-activedescendant'];
+  }
+  return createElement("div", {
+    className: classnames('components-custom-select-control', className)
+  }, hideLabelFromVision ? createElement(VisuallyHidden, {
+    as: "label",
+    ...getLabelProps()
+  }, label) : /* eslint-disable-next-line jsx-a11y/label-has-associated-control, jsx-a11y/label-has-for */
+  createElement(StyledLabel, {
+    ...getLabelProps({
+      className: 'components-custom-select-control__label'
+    })
+  }, label), createElement(InputBaseWithBackCompatMinWidth, {
+    __next40pxDefaultSize: __next40pxDefaultSize,
+    __nextUnconstrainedWidth: __nextUnconstrainedWidth,
+    isFocused: isOpen || isFocused,
+    __unstableInputWidth: __nextUnconstrainedWidth ? undefined : 'auto',
+    labelPosition: __nextUnconstrainedWidth ? undefined : 'top',
+    size: size,
+    suffix: createElement(SelectControlChevronDown, null)
+  }, createElement(SelectControlSelect, {
+    onMouseOver: onMouseOver,
+    onMouseOut: onMouseOut,
+    as: "button",
+    onFocus: handleOnFocus,
+    onBlur: handleOnBlur,
+    selectSize: size,
+    __next40pxDefaultSize: __next40pxDefaultSize,
+    ...getToggleButtonProps({
+      // This is needed because some speech recognition software don't support `aria-labelledby`.
+      'aria-label': label,
+      'aria-labelledby': undefined,
+      className: 'components-custom-select-control__button',
+      describedBy: getDescribedBy()
+    })
+  }, itemToString(selectedItem), __experimentalShowSelectedHint && selectedItem.__experimentalHint && createElement("span", {
+    className: "components-custom-select-control__hint"
+  }, selectedItem.__experimentalHint))), createElement("ul", {
+    ...menuProps,
+    onKeyDown: onKeyDownHandler
+  }, isOpen && items.map((item, index) =>
+  // eslint-disable-next-line react/jsx-key
+  createElement("li", {
+    ...getItemProps({
+      item,
+      index,
+      key: item.key,
+      className: classnames(item.className, 'components-custom-select-control__item', {
+        'is-highlighted': index === highlightedIndex,
+        'has-hint': !!item.__experimentalHint,
+        'is-next-40px-default-size': __next40pxDefaultSize
+      }),
+      style: item.style
+    })
+  }, item.name, item.__experimentalHint && createElement("span", {
+    className: "components-custom-select-control__item-hint"
+  }, item.__experimentalHint), item === selectedItem && createElement(Icon, {
+    icon: check,
+    className: "components-custom-select-control__item-icon"
+  })))));
+}
+export function StableCustomSelectControl(props) {
+  return createElement(CustomSelectControl, {
+    ...props,
+    __experimentalShowSelectedHint: false
+  });
+}
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/components/build-module/custom-select-control/styles.js

@@ -0,0 +1,18 @@
+import _styled from "@emotion/styled/base";
+/**
+ * External dependencies
+ */
+import { css } from '@emotion/react';
+/**
+ * Internal dependencies
+ */
+import InputBase from '../input-control/input-base';
+import { Container as InputControlContainer } from '../input-control/styles/input-control-styles';
+const backCompatMinWidth = props => !props.__nextUnconstrainedWidth ? /*#__PURE__*/css(InputControlContainer, "{min-width:130px;}" + (process.env.NODE_ENV === "production" ? "" : ";label:backCompatMinWidth;"), process.env.NODE_ENV === "production" ? "" : "/*# sourceMappingURL=data:application/json;charset=utf-8;base64,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 */") : '';
+export const InputBaseWithBackCompatMinWidth = /*#__PURE__*/_styled(InputBase, process.env.NODE_ENV === "production" ? {
+  target: "eswuck60"
+} : {
+  target: "eswuck60",
+  label: "InputBaseWithBackCompatMinWidth"
+})(backCompatMinWidth, ";" + (process.env.NODE_ENV === "production" ? "" : "/*# sourceMappingURL=data:application/json;charset=utf-8;base64,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 */"));
+//# sourceMappingURL=styles.js.map

node_modules/@wordpress/components/build-module/custom-select-control/styles.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["css","InputBase","Container","InputControlContainer","backCompatMinWidth","props","__nextUnconstrainedWidth","process","env","NODE_ENV","InputBaseWithBackCompatMinWidth","_styled","target","label"],"sources":["@wordpress/components/src/custom-select-control/styles.ts"],"sourcesContent":["/**\n * External dependencies\n */\nimport { css } from '@emotion/react';\nimport styled from '@emotion/styled';\n\n/**\n * Internal dependencies\n */\nimport InputBase from '../input-control/input-base';\nimport { Container as InputControlContainer } from '../input-control/styles/input-control-styles';\n\ntype BackCompatMinWidthProps = {\n\t__nextUnconstrainedWidth: boolean;\n};\n\nconst backCompatMinWidth = ( props: BackCompatMinWidthProps ) =>\n\t! props.__nextUnconstrainedWidth\n\t\t? css`\n\t\t\t\t${ InputControlContainer } {\n\t\t\t\t\tmin-width: 130px;\n\t\t\t\t}\n\t\t  `\n\t\t: '';\n\nexport const InputBaseWithBackCompatMinWidth = styled( InputBase )`\n\t${ backCompatMinWidth }\n`;\n"],"mappings":";AAAA;AACA;AACA;AACA,SAASA,GAAG,QAAQ,gBAAgB;AAGpC;AACA;AACA;AACA,OAAOC,SAAS,MAAM,6BAA6B;AACnD,SAASC,SAAS,IAAIC,qBAAqB,QAAQ,8CAA8C;AAMjG,MAAMC,kBAAkB,GAAKC,KAA8B,IAC1D,CAAEA,KAAK,CAACC,wBAAwB,gBAC7BN,GAAG,CACAG,qBAAqB,0BAAAI,OAAA,CAAAC,GAAA,CAAAC,QAAA,wDAAAF,OAAA,CAAAC,GAAA,CAAAC,QAAA,0xCAIxB,EAAE;AAEN,OAAO,MAAMC,+BAA+B,GAAG,aAAAC,OAAA,CAAQV,SAAS,EAAAM,OAAA,CAAAC,GAAA,CAAAC,QAAA;EAAAG,MAAA;AAAA;EAAAA,MAAA;EAAAC,KAAA;AAAA,CAAC,CAAC,CAC9DT,kBAAkB,SAAAG,OAAA,CAAAC,GAAA,CAAAC,QAAA,wxCACrB"}