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-warn-on-change/index.js

@@ -0,0 +1,45 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _usePrevious = _interopRequireDefault(require("../use-previous"));
+/**
+ * Internal dependencies
+ */
+
+// Disable reason: Object and object are distinctly different types in TypeScript and we mean the lowercase object in thise case
+// but eslint wants to force us to use `Object`. See https://stackoverflow.com/questions/49464634/difference-between-object-and-object-in-typescript
+/* eslint-disable jsdoc/check-types */
+/**
+ * Hook that performs a shallow comparison between the preview value of an object
+ * and the new one, if there's a difference, it prints it to the console.
+ * this is useful in performance related work, to check why a component re-renders.
+ *
+ *  @example
+ *
+ * ```jsx
+ * function MyComponent(props) {
+ *    useWarnOnChange(props);
+ *
+ *    return "Something";
+ * }
+ * ```
+ *
+ * @param {object} object Object which changes to compare.
+ * @param {string} prefix Just a prefix to show when console logging.
+ */
+function useWarnOnChange(object, prefix = 'Change detection') {
+  const previousValues = (0, _usePrevious.default)(object);
+  Object.entries(previousValues !== null && previousValues !== void 0 ? previousValues : []).forEach(([key, value]) => {
+    if (value !== object[( /** @type {keyof typeof object} */key)]) {
+      // eslint-disable-next-line no-console
+      console.warn(`${prefix}: ${key} key changed:`, value, object[( /** @type {keyof typeof object} */key)]
+      /* eslint-enable jsdoc/check-types */);
+    }
+  });
+}
+var _default = exports.default = useWarnOnChange;
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/compose/build/hooks/use-warn-on-change/index.js.map

@@ -0,0 +1 @@
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