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/eslint-plugin-jest/lib/rules/no-commented-out-tests.js

@@ -0,0 +1,44 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _utils = require("./utils");
+function hasTests(node) {
+  return /^\s*[xf]?(test|it|describe)(\.\w+|\[['"]\w+['"]\])?\s*\(/mu.test(node.value);
+}
+var _default = exports.default = (0, _utils.createRule)({
+  name: __filename,
+  meta: {
+    docs: {
+      category: 'Best Practices',
+      description: 'Disallow commented out tests',
+      recommended: 'warn'
+    },
+    messages: {
+      commentedTests: 'Some tests seem to be commented'
+    },
+    schema: [],
+    type: 'suggestion'
+  },
+  defaultOptions: [],
+  create(context) {
+    const sourceCode = (0, _utils.getSourceCode)(context);
+    function checkNode(node) {
+      if (!hasTests(node)) {
+        return;
+      }
+      context.report({
+        messageId: 'commentedTests',
+        node
+      });
+    }
+    return {
+      Program() {
+        const comments = sourceCode.getAllComments();
+        comments.forEach(checkNode);
+      }
+    };
+  }
+});