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/composite/index.js

@@ -0,0 +1,17 @@
+/**
+ * Composite is a component that may contain navigable items represented by
+ * CompositeItem. It's inspired by the WAI-ARIA Composite Role and implements
+ * all the keyboard navigation mechanisms to ensure that there's only one
+ * tab stop for the whole Composite element. This means that it can behave as
+ * a roving tabindex or aria-activedescendant container.
+ *
+ * @see https://reakit.io/docs/composite/
+ *
+ * The plan is to build own API that accounts for future breaking changes
+ * in Reakit (https://github.com/WordPress/gutenberg/pull/28085).
+ */
+/* eslint-disable-next-line no-restricted-imports */
+export { Composite, CompositeGroup, CompositeItem, useCompositeState } from 'reakit';
+
+/* eslint-disable-next-line no-restricted-imports */
+//# sourceMappingURL=index.js.map

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

@@ -0,0 +1 @@
+{"version":3,"names":["Composite","CompositeGroup","CompositeItem","useCompositeState"],"sources":["@wordpress/components/src/composite/index.ts"],"sourcesContent":["/**\n * Composite is a component that may contain navigable items represented by\n * CompositeItem. It's inspired by the WAI-ARIA Composite Role and implements\n * all the keyboard navigation mechanisms to ensure that there's only one\n * tab stop for the whole Composite element. This means that it can behave as\n * a roving tabindex or aria-activedescendant container.\n *\n * @see https://reakit.io/docs/composite/\n *\n * The plan is to build own API that accounts for future breaking changes\n * in Reakit (https://github.com/WordPress/gutenberg/pull/28085).\n */\n/* eslint-disable-next-line no-restricted-imports */\nexport {\n\tComposite,\n\tCompositeGroup,\n\tCompositeItem,\n\tuseCompositeState,\n} from 'reakit';\n\n/* eslint-disable-next-line no-restricted-imports */\nexport type { CompositeStateReturn as CompositeState } from 'reakit';\n"],"mappings":"AAAA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA,SACCA,SAAS,EACTC,cAAc,EACdC,aAAa,EACbC,iBAAiB,QACX,QAAQ;;AAEf"}

node_modules/@wordpress/components/build-module/composite/v2.js

@@ -0,0 +1,15 @@
+/**
+ * Composite is a component that may contain navigable items represented by
+ * CompositeItem. It's inspired by the WAI-ARIA Composite Role and implements
+ * all the keyboard navigation mechanisms to ensure that there's only one
+ * tab stop for the whole Composite element. This means that it can behave as
+ * a roving tabindex or aria-activedescendant container.
+ *
+ * @see https://ariakit.org/components/composite
+ */
+
+/* eslint-disable-next-line no-restricted-imports */
+export { Composite, CompositeGroup, CompositeGroupLabel, CompositeItem, CompositeRow, useCompositeStore } from '@ariakit/react';
+
+/* eslint-disable-next-line no-restricted-imports */
+//# sourceMappingURL=v2.js.map

node_modules/@wordpress/components/build-module/composite/v2.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["Composite","CompositeGroup","CompositeGroupLabel","CompositeItem","CompositeRow","useCompositeStore"],"sources":["@wordpress/components/src/composite/v2.ts"],"sourcesContent":["/**\n * Composite is a component that may contain navigable items represented by\n * CompositeItem. It's inspired by the WAI-ARIA Composite Role and implements\n * all the keyboard navigation mechanisms to ensure that there's only one\n * tab stop for the whole Composite element. This means that it can behave as\n * a roving tabindex or aria-activedescendant container.\n *\n * @see https://ariakit.org/components/composite\n */\n\n/* eslint-disable-next-line no-restricted-imports */\nexport {\n\tComposite,\n\tCompositeGroup,\n\tCompositeGroupLabel,\n\tCompositeItem,\n\tCompositeRow,\n\tuseCompositeStore,\n} from '@ariakit/react';\n\n/* eslint-disable-next-line no-restricted-imports */\nexport type { CompositeStore } from '@ariakit/react';\n"],"mappings":"AAAA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;;AAEA;AACA,SACCA,SAAS,EACTC,cAAc,EACdC,mBAAmB,EACnBC,aAAa,EACbC,YAAY,EACZC,iBAAiB,QACX,gBAAgB;;AAEvB"}