Submenu on node right-click aren't visible

### Prerequisites

- [x] I am running the latest version of ComfyUI
- [x] I have custom nodes enabled

### What happened?

If you right click a node to bring up the context menu, then select something with a submenu (eg 'Shape') the submenu is outside the visible area of the menu (you can just see it on the right hand side):

at the bottom is a scrollbar

but there is no way to access the scrollbar as it vanishes when the mouse leaves the menu item ('Shape').

This makes the submenus unusable.

### Steps to Reproduce

As described above

### How is this affecting you?

Feature doesn't work as expected

### ComfyUI Frontend Version

1.43.18

### Browser

Chrome/Chromium

### Console Errors

```javascript

```

### Logs

```shell

```

### Additional Context

Discovered as part of my attempt to port Use Everywhere nodes to 2.0