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/hooks/use-reduced-motion/index.js

@@ -0,0 +1,20 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _useMediaQuery = _interopRequireDefault(require("../use-media-query"));
+/**
+ * Internal dependencies
+ */
+
+/**
+ * Hook returning whether the user has a preference for reduced motion.
+ *
+ * @return {boolean} Reduced motion preference value.
+ */
+const useReducedMotion = () => (0, _useMediaQuery.default)('(prefers-reduced-motion: reduce)');
+var _default = exports.default = useReducedMotion;
+//# sourceMappingURL=index.js.map

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

@@ -0,0 +1 @@
+{"version":3,"names":["_useMediaQuery","_interopRequireDefault","require","useReducedMotion","useMediaQuery","_default","exports","default"],"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":";;;;;;;AAGA,IAAAA,cAAA,GAAAC,sBAAA,CAAAC,OAAA;AAHA;AACA;AACA;;AAGA;AACA;AACA;AACA;AACA;AACA,MAAMC,gBAAgB,GAAGA,CAAA,KACxB,IAAAC,sBAAa,EAAE,kCAAmC,CAAC;AAAC,IAAAC,QAAA,GAAAC,OAAA,CAAAC,OAAA,GAEtCJ,gBAAgB","ignoreList":[]}