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-module/hooks/use-instance-id/index.js

@@ -0,0 +1,50 @@
+/**
+ * WordPress dependencies
+ */
+import { useMemo } from '@wordpress/element';
+const instanceMap = new WeakMap();
+
+/**
+ * Creates a new id for a given object.
+ *
+ * @param object Object reference to create an id for.
+ * @return The instance id (index).
+ */
+function createId(object) {
+  const instances = instanceMap.get(object) || 0;
+  instanceMap.set(object, instances + 1);
+  return instances;
+}
+
+/**
+ * Specify the useInstanceId *function* signatures.
+ *
+ * More accurately, useInstanceId distinguishes between three different
+ * signatures:
+ *
+ * 1. When only object is given, the returned value is a number
+ * 2. When object and prefix is given, the returned value is a string
+ * 3. When preferredId is given, the returned value is the type of preferredId
+ *
+ * @param object Object reference to create an id for.
+ */
+
+/**
+ * Provides a unique instance ID.
+ *
+ * @param object        Object reference to create an id for.
+ * @param [prefix]      Prefix for the unique id.
+ * @param [preferredId] Default ID to use.
+ * @return The unique instance id.
+ */
+function useInstanceId(object, prefix, preferredId) {
+  return useMemo(() => {
+    if (preferredId) {
+      return preferredId;
+    }
+    const id = createId(object);
+    return prefix ? `${prefix}-${id}` : id;
+  }, [object, preferredId, prefix]);
+}
+export default useInstanceId;
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/compose/build-module/hooks/use-instance-id/index.js.map

@@ -0,0 +1 @@
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