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/hoist-non-react-statics/src/index.js

@@ -0,0 +1,104 @@
+/**
+ * Copyright 2015, Yahoo! Inc.
+ * Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
+ */
+import { ForwardRef, Memo, isMemo } from 'react-is';
+
+const REACT_STATICS = {
+    childContextTypes: true,
+    contextType: true,
+    contextTypes: true,
+    defaultProps: true,
+    displayName: true,
+    getDefaultProps: true,
+    getDerivedStateFromError: true,
+    getDerivedStateFromProps: true,
+    mixins: true,
+    propTypes: true,
+    type: true
+};
+
+const KNOWN_STATICS = {
+    name: true,
+    length: true,
+    prototype: true,
+    caller: true,
+    callee: true,
+    arguments: true,
+    arity: true
+};
+
+const FORWARD_REF_STATICS = {
+    '$$typeof': true,
+    render: true,
+    defaultProps: true,
+    displayName: true,
+    propTypes: true
+};
+
+const MEMO_STATICS = {
+    '$$typeof': true,
+    compare: true,
+    defaultProps: true,
+    displayName: true,
+    propTypes: true,
+    type: true,
+}
+
+const TYPE_STATICS = {};
+TYPE_STATICS[ForwardRef] = FORWARD_REF_STATICS;
+TYPE_STATICS[Memo] = MEMO_STATICS;
+
+function getStatics(component) {
+    // React v16.11 and below
+    if (isMemo(component)) {
+        return MEMO_STATICS;
+    }
+
+    // React v16.12 and above
+    return TYPE_STATICS[component['$$typeof']] || REACT_STATICS;
+}
+
+const defineProperty = Object.defineProperty;
+const getOwnPropertyNames = Object.getOwnPropertyNames;
+const getOwnPropertySymbols = Object.getOwnPropertySymbols;
+const getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
+const getPrototypeOf = Object.getPrototypeOf;
+const objectPrototype = Object.prototype;
+
+export default function hoistNonReactStatics(targetComponent, sourceComponent, blacklist) {
+    if (typeof sourceComponent !== 'string') { // don't hoist over string (html) components
+
+        if (objectPrototype) {
+            const inheritedComponent = getPrototypeOf(sourceComponent);
+            if (inheritedComponent && inheritedComponent !== objectPrototype) {
+                hoistNonReactStatics(targetComponent, inheritedComponent, blacklist);
+            }
+        }
+
+        let keys = getOwnPropertyNames(sourceComponent);
+
+        if (getOwnPropertySymbols) {
+            keys = keys.concat(getOwnPropertySymbols(sourceComponent));
+        }
+
+        const targetStatics = getStatics(targetComponent);
+        const sourceStatics = getStatics(sourceComponent);
+
+        for (let i = 0; i < keys.length; ++i) {
+            const key = keys[i];
+            if (!KNOWN_STATICS[key] &&
+                !(blacklist && blacklist[key]) &&
+                !(sourceStatics && sourceStatics[key]) &&
+                !(targetStatics && targetStatics[key])
+            ) {
+                const descriptor = getOwnPropertyDescriptor(sourceComponent, key);
+                try { // Avoid failures from read-only properties
+                    defineProperty(targetComponent, key, descriptor);
+                } catch (e) {}
+            }
+        }
+    }
+
+    return targetComponent;
+};