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/@emotion/css/dist/declarations/src/create-instance.d.ts

@@ -0,0 +1,30 @@
+import { CSSInterpolation } from '@emotion/serialize';
+import { EmotionCache, Options } from '@emotion/cache';
+import { StyleSheet } from '@emotion/sheet';
+export type { CSSInterpolation, ArrayCSSInterpolation, ComponentSelector, CSSObject } from '@emotion/serialize';
+export type { EmotionCache, Options };
+export interface ArrayClassNamesArg extends Array<ClassNamesArg> {
+}
+export type ClassNamesArg = undefined | null | string | boolean | {
+    [className: string]: boolean | null | undefined;
+} | ArrayClassNamesArg;
+export interface CSSStyleSheet extends StyleSheet {
+    speedy(value: boolean): void;
+}
+export interface Emotion {
+    css(template: TemplateStringsArray, ...args: Array<CSSInterpolation>): string;
+    css(...args: Array<CSSInterpolation>): string;
+    cx(...classNames: Array<ClassNamesArg>): string;
+    flush(): void;
+    hydrate(ids: Array<string>): void;
+    injectGlobal(template: TemplateStringsArray, ...args: Array<CSSInterpolation>): void;
+    injectGlobal(...args: Array<CSSInterpolation>): void;
+    keyframes(template: TemplateStringsArray, ...args: Array<CSSInterpolation>): string;
+    keyframes(...args: Array<CSSInterpolation>): string;
+    sheet: CSSStyleSheet;
+    cache: EmotionCache;
+    merge(className: string): string;
+    getRegisteredStyles(registeredStyles: Array<string>, className: string): string;
+}
+declare let createEmotion: (options: Options) => Emotion;
+export default createEmotion;

node_modules/@emotion/css/dist/declarations/src/index.d.ts

@@ -0,0 +1,10 @@
+export declare const flush: () => void, hydrate: (ids: string[]) => void, cx: (...classNames: import("./create-instance.js").ClassNamesArg[]) => string, merge: (className: string) => string, getRegisteredStyles: (registeredStyles: string[], className: string) => string, injectGlobal: {
+    (template: TemplateStringsArray, ...args: import("./create-instance.js").CSSInterpolation[]): void;
+    (...args: import("./create-instance.js").CSSInterpolation[]): void;
+}, keyframes: {
+    (template: TemplateStringsArray, ...args: import("./create-instance.js").CSSInterpolation[]): string;
+    (...args: import("./create-instance.js").CSSInterpolation[]): string;
+}, css: {
+    (template: TemplateStringsArray, ...args: import("./create-instance.js").CSSInterpolation[]): string;
+    (...args: import("./create-instance.js").CSSInterpolation[]): string;
+}, sheet: import("./create-instance.js").CSSStyleSheet, cache: import("./create-instance.js").EmotionCache;