Use `ghost_element_background` for avatar background color (#3819)

Also add a couple todo!()s on top of the comments

Release Notes:

- N/A

Kirill Bulatov committed 2y ago

5f2bb82ef3d0443106355e7396f2b6d0a5fc3820

Committed by GitHub <noreply@github.com> on 12/29/2023, 11:19:26 PM