Prompt hint colours messed up since codex 80

Was:

<img width="500" height="278" alt="Image" src="https://github.com/user-attachments/assets/fe8b39d1-2999-444d-9bb9-1ed1bae7e0a8" />

Now:

<img width="568" height="183" alt="Image" src="https://github.com/user-attachments/assets/d315c879-c446-4e69-baf0-04d72abee8a3" />

This is very distracting, and makes it impossible to see the cursor.

Kindly add a flag to completely disable hints. Here would be a good place:

[notice]
hide_gpt5_1_migration_prompt = true

Maybe hide_hints = true.