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/clipboard-button/index.js

@@ -0,0 +1,64 @@
+import { createElement } from "react";
+/**
+ * External dependencies
+ */
+import classnames from 'classnames';
+
+/**
+ * WordPress dependencies
+ */
+import { useRef, useEffect } from '@wordpress/element';
+import { useCopyToClipboard } from '@wordpress/compose';
+import deprecated from '@wordpress/deprecated';
+
+/**
+ * Internal dependencies
+ */
+import Button from '../button';
+const TIMEOUT = 4000;
+export default function ClipboardButton({
+  className,
+  children,
+  onCopy,
+  onFinishCopy,
+  text,
+  ...buttonProps
+}) {
+  deprecated('wp.components.ClipboardButton', {
+    since: '5.8',
+    alternative: 'wp.compose.useCopyToClipboard'
+  });
+  const timeoutId = useRef();
+  const ref = useCopyToClipboard(text, () => {
+    onCopy();
+    if (timeoutId.current) {
+      clearTimeout(timeoutId.current);
+    }
+    if (onFinishCopy) {
+      timeoutId.current = setTimeout(() => onFinishCopy(), TIMEOUT);
+    }
+  });
+  useEffect(() => {
+    if (timeoutId.current) {
+      clearTimeout(timeoutId.current);
+    }
+  }, []);
+  const classes = classnames('components-clipboard-button', className);
+
+  // Workaround for inconsistent behavior in Safari, where <textarea> is not
+  // the document.activeElement at the moment when the copy event fires.
+  // This causes documentHasSelection() in the copy-handler component to
+  // mistakenly override the ClipboardButton, and copy a serialized string
+  // of the current block instead.
+  const focusOnCopyEventTarget = event => {
+    // @ts-expect-error: Should be currentTarget, but not changing because this component is deprecated.
+    event.target.focus();
+  };
+  return createElement(Button, {
+    ...buttonProps,
+    className: classes,
+    ref: ref,
+    onCopy: focusOnCopyEventTarget
+  }, children);
+}
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/components/build-module/clipboard-button/index.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["classnames","useRef","useEffect","useCopyToClipboard","deprecated","Button","TIMEOUT","ClipboardButton","className","children","onCopy","onFinishCopy","text","buttonProps","since","alternative","timeoutId","ref","current","clearTimeout","setTimeout","classes","focusOnCopyEventTarget","event","target","focus","createElement"],"sources":["@wordpress/components/src/clipboard-button/index.tsx"],"sourcesContent":["/**\n * External dependencies\n */\nimport classnames from 'classnames';\n\n/**\n * WordPress dependencies\n */\nimport { useRef, useEffect } from '@wordpress/element';\nimport { useCopyToClipboard } from '@wordpress/compose';\nimport deprecated from '@wordpress/deprecated';\n\n/**\n * Internal dependencies\n */\nimport Button from '../button';\nimport type { ClipboardButtonProps } from './types';\nimport type { WordPressComponentProps } from '../context';\n\nconst TIMEOUT = 4000;\n\nexport default function ClipboardButton( {\n\tclassName,\n\tchildren,\n\tonCopy,\n\tonFinishCopy,\n\ttext,\n\t...buttonProps\n}: WordPressComponentProps< ClipboardButtonProps, 'button', false > ) {\n\tdeprecated( 'wp.components.ClipboardButton', {\n\t\tsince: '5.8',\n\t\talternative: 'wp.compose.useCopyToClipboard',\n\t} );\n\n\tconst timeoutId = useRef< NodeJS.Timeout >();\n\tconst ref = useCopyToClipboard( text, () => {\n\t\tonCopy();\n\t\tif ( timeoutId.current ) {\n\t\t\tclearTimeout( timeoutId.current );\n\t\t}\n\n\t\tif ( onFinishCopy ) {\n\t\t\ttimeoutId.current = setTimeout( () => onFinishCopy(), TIMEOUT );\n\t\t}\n\t} );\n\n\tuseEffect( () => {\n\t\tif ( timeoutId.current ) {\n\t\t\tclearTimeout( timeoutId.current );\n\t\t}\n\t}, [] );\n\n\tconst classes = classnames( 'components-clipboard-button', className );\n\n\t// Workaround for inconsistent behavior in Safari, where <textarea> is not\n\t// the document.activeElement at the moment when the copy event fires.\n\t// This causes documentHasSelection() in the copy-handler component to\n\t// mistakenly override the ClipboardButton, and copy a serialized string\n\t// of the current block instead.\n\tconst focusOnCopyEventTarget: React.ClipboardEventHandler = ( event ) => {\n\t\t// @ts-expect-error: Should be currentTarget, but not changing because this component is deprecated.\n\t\tevent.target.focus();\n\t};\n\n\treturn (\n\t\t<Button\n\t\t\t{ ...buttonProps }\n\t\t\tclassName={ classes }\n\t\t\tref={ ref }\n\t\t\tonCopy={ focusOnCopyEventTarget }\n\t\t>\n\t\t\t{ children }\n\t\t</Button>\n\t);\n}\n"],"mappings":";AAAA;AACA;AACA;AACA,OAAOA,UAAU,MAAM,YAAY;;AAEnC;AACA;AACA;AACA,SAASC,MAAM,EAAEC,SAAS,QAAQ,oBAAoB;AACtD,SAASC,kBAAkB,QAAQ,oBAAoB;AACvD,OAAOC,UAAU,MAAM,uBAAuB;;AAE9C;AACA;AACA;AACA,OAAOC,MAAM,MAAM,WAAW;AAI9B,MAAMC,OAAO,GAAG,IAAI;AAEpB,eAAe,SAASC,eAAeA,CAAE;EACxCC,SAAS;EACTC,QAAQ;EACRC,MAAM;EACNC,YAAY;EACZC,IAAI;EACJ,GAAGC;AAC8D,CAAC,EAAG;EACrET,UAAU,CAAE,+BAA+B,EAAE;IAC5CU,KAAK,EAAE,KAAK;IACZC,WAAW,EAAE;EACd,CAAE,CAAC;EAEH,MAAMC,SAAS,GAAGf,MAAM,CAAmB,CAAC;EAC5C,MAAMgB,GAAG,GAAGd,kBAAkB,CAAES,IAAI,EAAE,MAAM;IAC3CF,MAAM,CAAC,CAAC;IACR,IAAKM,SAAS,CAACE,OAAO,EAAG;MACxBC,YAAY,CAAEH,SAAS,CAACE,OAAQ,CAAC;IAClC;IAEA,IAAKP,YAAY,EAAG;MACnBK,SAAS,CAACE,OAAO,GAAGE,UAAU,CAAE,MAAMT,YAAY,CAAC,CAAC,EAAEL,OAAQ,CAAC;IAChE;EACD,CAAE,CAAC;EAEHJ,SAAS,CAAE,MAAM;IAChB,IAAKc,SAAS,CAACE,OAAO,EAAG;MACxBC,YAAY,CAAEH,SAAS,CAACE,OAAQ,CAAC;IAClC;EACD,CAAC,EAAE,EAAG,CAAC;EAEP,MAAMG,OAAO,GAAGrB,UAAU,CAAE,6BAA6B,EAAEQ,SAAU,CAAC;;EAEtE;EACA;EACA;EACA;EACA;EACA,MAAMc,sBAAmD,GAAKC,KAAK,IAAM;IACxE;IACAA,KAAK,CAACC,MAAM,CAACC,KAAK,CAAC,CAAC;EACrB,CAAC;EAED,OACCC,aAAA,CAACrB,MAAM;IAAA,GACDQ,WAAW;IAChBL,SAAS,EAAGa,OAAS;IACrBJ,GAAG,EAAGA,GAAK;IACXP,MAAM,EAAGY;EAAwB,GAE/Bb,QACK,CAAC;AAEX"}

node_modules/@wordpress/components/build-module/clipboard-button/types.js

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

node_modules/@wordpress/components/build-module/clipboard-button/types.js.map

@@ -0,0 +1 @@
+{"version":3,"names":[],"sources":["@wordpress/components/src/clipboard-button/types.ts"],"sourcesContent":["/**\n * External dependencies\n */\nimport type { ReactNode } from 'react';\n\nexport interface ClipboardButtonProps {\n\tchildren: ReactNode;\n\tonCopy: () => void;\n\tonFinishCopy?: () => void;\n\ttext: string;\n}\n"],"mappings":""}