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/motion/features/gestures.mjs

@@ -0,0 +1,21 @@
+import { HoverGesture } from '../../gestures/hover.mjs';
+import { FocusGesture } from '../../gestures/focus.mjs';
+import { PressGesture } from '../../gestures/press.mjs';
+import { InViewFeature } from './viewport/index.mjs';
+
+const gestureAnimations = {
+    inView: {
+        Feature: InViewFeature,
+    },
+    tap: {
+        Feature: PressGesture,
+    },
+    focus: {
+        Feature: FocusGesture,
+    },
+    hover: {
+        Feature: HoverGesture,
+    },
+};
+
+export { gestureAnimations };