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/domutils/lib/esm/querying.d.ts

@@ -0,0 +1,64 @@
+import { Element, AnyNode, ParentNode } from "domhandler";
+/**
+ * Search a node and its children for nodes passing a test function. If `node` is not an array, it will be wrapped in one.
+ *
+ * @category Querying
+ * @param test Function to test nodes on.
+ * @param node Node to search. Will be included in the result set if it matches.
+ * @param recurse Also consider child nodes.
+ * @param limit Maximum number of nodes to return.
+ * @returns All nodes passing `test`.
+ */
+export declare function filter(test: (elem: AnyNode) => boolean, node: AnyNode | AnyNode[], recurse?: boolean, limit?: number): AnyNode[];
+/**
+ * Search an array of nodes and their children for nodes passing a test function.
+ *
+ * @category Querying
+ * @param test Function to test nodes on.
+ * @param nodes Array of nodes to search.
+ * @param recurse Also consider child nodes.
+ * @param limit Maximum number of nodes to return.
+ * @returns All nodes passing `test`.
+ */
+export declare function find(test: (elem: AnyNode) => boolean, nodes: AnyNode[] | ParentNode, recurse: boolean, limit: number): AnyNode[];
+/**
+ * Finds the first element inside of an array that matches a test function. This is an alias for `Array.prototype.find`.
+ *
+ * @category Querying
+ * @param test Function to test nodes on.
+ * @param nodes Array of nodes to search.
+ * @returns The first node in the array that passes `test`.
+ * @deprecated Use `Array.prototype.find` directly.
+ */
+export declare function findOneChild<T>(test: (elem: T) => boolean, nodes: T[]): T | undefined;
+/**
+ * Finds one element in a tree that passes a test.
+ *
+ * @category Querying
+ * @param test Function to test nodes on.
+ * @param nodes Node or array of nodes to search.
+ * @param recurse Also consider child nodes.
+ * @returns The first node that passes `test`.
+ */
+export declare function findOne(test: (elem: Element) => boolean, nodes: AnyNode[] | ParentNode, recurse?: boolean): Element | null;
+/**
+ * Checks if a tree of nodes contains at least one node passing a test.
+ *
+ * @category Querying
+ * @param test Function to test nodes on.
+ * @param nodes Array of nodes to search.
+ * @returns Whether a tree of nodes contains at least one node passing the test.
+ */
+export declare function existsOne(test: (elem: Element) => boolean, nodes: AnyNode[] | ParentNode): boolean;
+/**
+ * Search an array of nodes and their children for elements passing a test function.
+ *
+ * Same as `find`, but limited to elements and with less options, leading to reduced complexity.
+ *
+ * @category Querying
+ * @param test Function to test nodes on.
+ * @param nodes Array of nodes to search.
+ * @returns All nodes passing `test`.
+ */
+export declare function findAll(test: (elem: Element) => boolean, nodes: AnyNode[] | ParentNode): Element[];
+//# sourceMappingURL=querying.d.ts.map