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/framer-motion/dist/es/render/html/HTMLVisualElement.mjs

@@ -0,0 +1,59 @@
+import { buildHTMLStyles } from './utils/build-styles.mjs';
+import { isCSSVariableName } from '../dom/utils/is-css-variable.mjs';
+import { transformProps } from './utils/transform.mjs';
+import { scrapeMotionValuesFromProps } from './utils/scrape-motion-values.mjs';
+import { renderHTML } from './utils/render.mjs';
+import { getDefaultValueType } from '../dom/value-types/defaults.mjs';
+import { measureViewportBox } from '../../projection/utils/measure.mjs';
+import { DOMVisualElement } from '../dom/DOMVisualElement.mjs';
+import { isMotionValue } from '../../value/utils/is-motion-value.mjs';
+
+function getComputedStyle(element) {
+    return window.getComputedStyle(element);
+}
+class HTMLVisualElement extends DOMVisualElement {
+    constructor() {
+        super(...arguments);
+        this.type = "html";
+    }
+    readValueFromInstance(instance, key) {
+        if (transformProps.has(key)) {
+            const defaultType = getDefaultValueType(key);
+            return defaultType ? defaultType.default || 0 : 0;
+        }
+        else {
+            const computedStyle = getComputedStyle(instance);
+            const value = (isCSSVariableName(key)
+                ? computedStyle.getPropertyValue(key)
+                : computedStyle[key]) || 0;
+            return typeof value === "string" ? value.trim() : value;
+        }
+    }
+    measureInstanceViewportBox(instance, { transformPagePoint }) {
+        return measureViewportBox(instance, transformPagePoint);
+    }
+    build(renderState, latestValues, options, props) {
+        buildHTMLStyles(renderState, latestValues, options, props.transformTemplate);
+    }
+    scrapeMotionValuesFromProps(props, prevProps) {
+        return scrapeMotionValuesFromProps(props, prevProps);
+    }
+    handleChildMotionValue() {
+        if (this.childSubscription) {
+            this.childSubscription();
+            delete this.childSubscription;
+        }
+        const { children } = this.props;
+        if (isMotionValue(children)) {
+            this.childSubscription = children.on("change", (latest) => {
+                if (this.current)
+                    this.current.textContent = `${latest}`;
+            });
+        }
+    }
+    renderInstance(instance, renderState, styleProp, projection) {
+        renderHTML(instance, renderState, styleProp, projection);
+    }
+}
+
+export { HTMLVisualElement, getComputedStyle };