Highlight user-authored messages in chat threads

Feature request for product/service

Chat

Describe the request

On my agent’s words :laughing::
“I’d love an option to visually highlight my own messages in chat and agent threads. In longer threads, user messages blend in and it slows down scanning.
Requested behavior:
Add a setting to customize user-message appearance (background tint, border, or accent bar)
Keep assistant/system messages visually distinct (old school chat style setting?)
Respect current theme (light/dark) and accessibility contrast
Optional per-thread toggle would be great
Why this matters:
Faster backtracking in long debugging sessions
Clearer ownership of prompts vs responses
Better thread readability overall
This would be a big UX upgrade for power users. Thanks!”

Operating System (if it applies)

MacOS