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/css-select/lib/helpers/querying.d.ts

@@ -0,0 +1,24 @@
+import type { InternalOptions, Predicate, Adapter } from "../types.js";
+/**
+ * Find all elements matching the query. If not in XML mode, the query will ignore
+ * the contents of `<template>` elements.
+ *
+ * @param query - Function that returns true if the element matches the query.
+ * @param elems - Nodes to query. If a node is an element, its children will be queried.
+ * @param options - Options for querying the document.
+ * @returns All matching elements.
+ */
+export declare function findAll<Node, ElementNode extends Node>(query: Predicate<ElementNode>, elems: Node[], options: InternalOptions<Node, ElementNode>): ElementNode[];
+/**
+ * Find the first element matching the query. If not in XML mode, the query will ignore
+ * the contents of `<template>` elements.
+ *
+ * @param query - Function that returns true if the element matches the query.
+ * @param elems - Nodes to query. If a node is an element, its children will be queried.
+ * @param options - Options for querying the document.
+ * @returns The first matching element, or null if there was no match.
+ */
+export declare function findOne<Node, ElementNode extends Node>(query: Predicate<ElementNode>, elems: Node[], options: InternalOptions<Node, ElementNode>): ElementNode | null;
+export declare function getNextSiblings<Node, ElementNode extends Node>(elem: Node, adapter: Adapter<Node, ElementNode>): ElementNode[];
+export declare function getElementParent<Node, ElementNode extends Node>(node: ElementNode, adapter: Adapter<Node, ElementNode>): ElementNode | null;
+//# sourceMappingURL=querying.d.ts.map