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/utils/reduced-motion/use-reduced-motion-config.mjs

@@ -0,0 +1,19 @@
+import { useContext } from 'react';
+import { MotionConfigContext } from '../../context/MotionConfigContext.mjs';
+import { useReducedMotion } from './use-reduced-motion.mjs';
+
+function useReducedMotionConfig() {
+    const reducedMotionPreference = useReducedMotion();
+    const { reducedMotion } = useContext(MotionConfigContext);
+    if (reducedMotion === "never") {
+        return false;
+    }
+    else if (reducedMotion === "always") {
+        return true;
+    }
+    else {
+        return reducedMotionPreference;
+    }
+}
+
+export { useReducedMotionConfig };