feat(node-toolbar): add node-toolbar component

packages/node-toolbar/src/NodeToolbarPortal.tsx

@@ -0,0 +1,15 @@
+import { ReactNode } from 'react';
+import { createPortal } from 'react-dom';
+import { ReactFlowState, useStore } from '@reactflow/core';
+
+function NodeToolbarPortal({ children }: { children: ReactNode }) {
+  const wrapperRef = useStore((state: ReactFlowState) => state.domNode?.querySelector('.react-flow__pane'));
+
+  if (!wrapperRef) {
+    return null;
+  }
+
+  return createPortal(children, wrapperRef);
+}
+
+export default NodeToolbarPortal;