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/gestures/focus.mjs

@@ -0,0 +1,41 @@
+import { addDomEvent } from '../events/add-dom-event.mjs';
+import { Feature } from '../motion/features/Feature.mjs';
+import { pipe } from '../utils/pipe.mjs';
+
+class FocusGesture extends Feature {
+    constructor() {
+        super(...arguments);
+        this.isActive = false;
+    }
+    onFocus() {
+        let isFocusVisible = false;
+        /**
+         * If this element doesn't match focus-visible then don't
+         * apply whileHover. But, if matches throws that focus-visible
+         * is not a valid selector then in that browser outline styles will be applied
+         * to the element by default and we want to match that behaviour with whileFocus.
+         */
+        try {
+            isFocusVisible = this.node.current.matches(":focus-visible");
+        }
+        catch (e) {
+            isFocusVisible = true;
+        }
+        if (!isFocusVisible || !this.node.animationState)
+            return;
+        this.node.animationState.setActive("whileFocus", true);
+        this.isActive = true;
+    }
+    onBlur() {
+        if (!this.isActive || !this.node.animationState)
+            return;
+        this.node.animationState.setActive("whileFocus", false);
+        this.isActive = false;
+    }
+    mount() {
+        this.unmount = pipe(addDomEvent(this.node.current, "focus", () => this.onFocus()), addDomEvent(this.node.current, "blur", () => this.onBlur()));
+    }
+    unmount() { }
+}
+
+export { FocusGesture };