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/@wordpress/compose/build-module/utils/observable-map/index.js

@@ -0,0 +1,52 @@
+/**
+ * A constructor (factory) for `ObservableMap`, a map-like key/value data structure
+ * where the individual entries are observable: using the `subscribe` method, you can
+ * subscribe to updates for a particular keys. Each subscriber always observes one
+ * specific key and is not notified about any unrelated changes (for different keys)
+ * in the `ObservableMap`.
+ *
+ * @template K The type of the keys in the map.
+ * @template V The type of the values in the map.
+ * @return   A new instance of the `ObservableMap` type.
+ */
+export function observableMap() {
+  const map = new Map();
+  const listeners = new Map();
+  function callListeners(name) {
+    const list = listeners.get(name);
+    if (!list) {
+      return;
+    }
+    for (const listener of list) {
+      listener();
+    }
+  }
+  return {
+    get(name) {
+      return map.get(name);
+    },
+    set(name, value) {
+      map.set(name, value);
+      callListeners(name);
+    },
+    delete(name) {
+      map.delete(name);
+      callListeners(name);
+    },
+    subscribe(name, listener) {
+      let list = listeners.get(name);
+      if (!list) {
+        list = new Set();
+        listeners.set(name, list);
+      }
+      list.add(listener);
+      return () => {
+        list.delete(listener);
+        if (list.size === 0) {
+          listeners.delete(name);
+        }
+      };
+    }
+  };
+}
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/compose/build-module/utils/observable-map/index.js.map

@@ -0,0 +1 @@
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