Bug: TopBar menu does not close upon clicking left nav links

### Steps to reproduce

- Open the TopBar menu in Cauldron
- Do not click any of the menu options
- Click any of the navigation links in the left pane (e.g. Introduction > Component Guidelines)
- TopBar menu is still open

### Expected Behavior

TopBar menu should close upon clicking outside the menu

### Actual Behavior

TopBar menu stays open upon clicking outside nav links

### Version

5.9.1

### What browsers are you experiencing the problem on?

Firefox, Chrome, Safari

### Relevant log output

_No response_

### Anything else we should know?

_No response_

Reproduce the issue in Cauldron by opening the TopBar menu and selecting a left-pane navigation link in Firefox, Chrome, or Safari. Trace the TopBar menu and left navigation entry points, then verify that the menu closes when any outside navigation link is clicked.

Written by the indexing model from the issue text.