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/compose/build-module/hooks/use-reduced-motion/index.js

@@ -0,0 +1,13 @@
+/**
+ * Internal dependencies
+ */
+import useMediaQuery from '../use-media-query';
+
+/**
+ * Hook returning whether the user has a preference for reduced motion.
+ *
+ * @return {boolean} Reduced motion preference value.
+ */
+const useReducedMotion = () => useMediaQuery('(prefers-reduced-motion: reduce)');
+export default useReducedMotion;
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/compose/build-module/hooks/use-reduced-motion/index.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["useMediaQuery","useReducedMotion"],"sources":["@wordpress/compose/src/hooks/use-reduced-motion/index.js"],"sourcesContent":["/**\n * Internal dependencies\n */\nimport useMediaQuery from '../use-media-query';\n\n/**\n * Hook returning whether the user has a preference for reduced motion.\n *\n * @return {boolean} Reduced motion preference value.\n */\nconst useReducedMotion = () =>\n\tuseMediaQuery( '(prefers-reduced-motion: reduce)' );\n\nexport default useReducedMotion;\n"],"mappings":"AAAA;AACA;AACA;AACA,OAAOA,aAAa,MAAM,oBAAoB;;AAE9C;AACA;AACA;AACA;AACA;AACA,MAAMC,gBAAgB,GAAGA,CAAA,KACxBD,aAAa,CAAE,kCAAmC,CAAC;AAEpD,eAAeC,gBAAgB","ignoreList":[]}