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/reakit/ts/Form/utils/getIn.d.ts

@@ -0,0 +1,3 @@
+import { DeepPath, DeepPathValue } from "../__utils/types";
+export declare function unstable_getIn<T extends Record<any, any>, P extends DeepPath<T, P>, D>(object: T, path: P, defaultValue: D): D;
+export declare function unstable_getIn<T extends Record<any, any>, P extends DeepPath<T, P>>(object: T, path: P, defaultValue?: any): DeepPathValue<T, P> | undefined;

node_modules/reakit/ts/Form/utils/index.d.ts

@@ -0,0 +1,3 @@
+export * from "./getIn";
+export * from "./setAllIn";
+export * from "./setIn";

node_modules/reakit/ts/Form/utils/setAllIn.d.ts

@@ -0,0 +1,2 @@
+import { DeepMap } from "../__utils/types";
+export declare function unstable_setAllIn<T, V>(object: T, value: V): DeepMap<T, V>;

node_modules/reakit/ts/Form/utils/setIn.d.ts

@@ -0,0 +1,2 @@
+import { DeepPath } from "../__utils/types";
+export declare function unstable_setIn<T extends Record<any, any> | Array<any>, P extends DeepPath<T, P>>(object: T, path: P, value: any): T;