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/jest/build/index.d.ts

@@ -0,0 +1,26 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+import type {Config as Config_2} from '@jest/types';
+import {createTestScheduler} from '@jest/core';
+import {getVersion} from '@jest/core';
+import {run} from 'jest-cli';
+import {runCLI} from '@jest/core';
+import {SearchSource} from '@jest/core';
+
+export declare type Config = Config_2.InitialOptions;
+
+export {createTestScheduler};
+
+export {getVersion};
+
+export {run};
+
+export {runCLI};
+
+export {SearchSource};
+
+export {};

node_modules/jest/build/index.js

@@ -0,0 +1,49 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+Object.defineProperty(exports, 'SearchSource', {
+  enumerable: true,
+  get: function () {
+    return _core().SearchSource;
+  }
+});
+Object.defineProperty(exports, 'createTestScheduler', {
+  enumerable: true,
+  get: function () {
+    return _core().createTestScheduler;
+  }
+});
+Object.defineProperty(exports, 'getVersion', {
+  enumerable: true,
+  get: function () {
+    return _core().getVersion;
+  }
+});
+Object.defineProperty(exports, 'run', {
+  enumerable: true,
+  get: function () {
+    return _jestCli().run;
+  }
+});
+Object.defineProperty(exports, 'runCLI', {
+  enumerable: true,
+  get: function () {
+    return _core().runCLI;
+  }
+});
+function _core() {
+  const data = require('@jest/core');
+  _core = function () {
+    return data;
+  };
+  return data;
+}
+function _jestCli() {
+  const data = require('jest-cli');
+  _jestCli = function () {
+    return data;
+  };
+  return data;
+}