Node Toolbar
For many types of applications, having a toolbar or set of controls appear when
a node is selected can be quite useful. It's so useful, in fact, that we've built
the <NodeToolbar /> component to make
it easy to add this functionality to your custom nodes!
Content in the toolbar is not scaled as you zoom your flow in and out: this means it should always be visible.
For more information on the <NodeToolbar /> component and its props, check out
the API reference.