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/@babel/preset-env/lib/plugins-compat-data.js

@@ -0,0 +1,26 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.pluginsBugfixes = exports.plugins = exports.overlappingPlugins = void 0;
+var _availablePlugins = require("./available-plugins.js");
+const originalPlugins = require("@babel/compat-data/plugins"),
+  originalPluginsBugfixes = require("@babel/compat-data/plugin-bugfixes"),
+  originalOverlappingPlugins = require("@babel/compat-data/overlapping-plugins");
+const keys = Object.keys;
+const plugins = exports.plugins = filterAvailable(originalPlugins);
+const pluginsBugfixes = exports.pluginsBugfixes = filterAvailable(originalPluginsBugfixes);
+const overlappingPlugins = exports.overlappingPlugins = filterAvailable(originalOverlappingPlugins);
+overlappingPlugins["syntax-import-attributes"] = ["syntax-import-assertions"];
+function filterAvailable(data) {
+  const result = {};
+  for (const plugin of keys(data)) {
+    if (hasOwnProperty.call(_availablePlugins.default, plugin)) {
+      result[plugin] = data[plugin];
+    }
+  }
+  return result;
+}
+
+//# sourceMappingURL=plugins-compat-data.js.map