username coloring in monet themes

[retroflexivity]

Is your feature request related to a problem? Please describe.
Currently, in monet themes, all standard username colors become monochrome (while recently added multi-colors don't, see the image). It makes it harder to distinguish users in chats (while the new ones harmonize poorly).

Describe the solution you'd like
MD3 guidelines propose that static colors be preserved but tinted: https://m3.material.io/styles/color/advanced/adjust-existing-colors#1cc12e43-237b-45b9-8fe0-9a3549c1f61e. I believe username colors (both old and new ones) could be redefined like this instead of making them fully monochrome. It would both look good and preserve the functionality.