Header: Dropdown panel says it's expanded when it's not

[kangabell]

If the dropdown to select an LLM endpoint is opened, then exited, when returning the screen reader sometimes says the menu is still expanded when it's not. It may not be clear to the user that the control needs to be activated first in order to access the menu again.

WCAG Criteria

1.3.1 Info and Relationships - A

Testing Environment

http://159.89.83.1/c/new

Testing Method

Manual - VoiceOver, Firefox, MacOS / VoiceOver, Safari, MacOS

Screenshots

https://share.zight.com/v1uGmKKp

Screen Recording

https://share.zight.com/v1uGmKKp
A screen reader (VoiceOver) says "expanded" when the element is closed.

Recommended Action

Make sure the aria-expanded attribute is always updated to "false" when the menu is exited and "true" when re-activated.