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/reakit/es/reverse-30eaa122.js

@@ -0,0 +1,41 @@
+import { b as _createForOfIteratorHelperLoose } from './_rollupPluginBabelHelpers-1f0bf8c2.js';
+
+function groupItems(items) {
+  var groups = [[]];
+
+  var _loop = function _loop() {
+    var item = _step.value;
+    var group = groups.find(function (g) {
+      return !g[0] || g[0].groupId === item.groupId;
+    });
+
+    if (group) {
+      group.push(item);
+    } else {
+      groups.push([item]);
+    }
+  };
+
+  for (var _iterator = _createForOfIteratorHelperLoose(items), _step; !(_step = _iterator()).done;) {
+    _loop();
+  }
+
+  return groups;
+}
+
+function flatten(grid) {
+  var flattened = [];
+
+  for (var _iterator = _createForOfIteratorHelperLoose(grid), _step; !(_step = _iterator()).done;) {
+    var row = _step.value;
+    flattened.push.apply(flattened, row);
+  }
+
+  return flattened;
+}
+
+function reverse(array) {
+  return array.slice().reverse();
+}
+
+export { flatten as f, groupItems as g, reverse as r };