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/animation/utils/create-visual-element.mjs

@@ -0,0 +1,32 @@
+import { isSVGElement } from '../../render/dom/utils/is-svg-element.mjs';
+import { SVGVisualElement } from '../../render/svg/SVGVisualElement.mjs';
+import { HTMLVisualElement } from '../../render/html/HTMLVisualElement.mjs';
+import { visualElementStore } from '../../render/store.mjs';
+
+function createVisualElement(element) {
+    const options = {
+        presenceContext: null,
+        props: {},
+        visualState: {
+            renderState: {
+                transform: {},
+                transformOrigin: {},
+                style: {},
+                vars: {},
+                attrs: {},
+            },
+            latestValues: {},
+        },
+    };
+    const node = isSVGElement(element)
+        ? new SVGVisualElement(options, {
+            enableHardwareAcceleration: false,
+        })
+        : new HTMLVisualElement(options, {
+            enableHardwareAcceleration: true,
+        });
+    node.mount(element);
+    visualElementStore.set(element, node);
+}
+
+export { createVisualElement };