zeta: Improve reviewing UI (#21838)

Starting to fine-tune it.

| No edits scenario | Rated edits scenario |
|--------|--------|
| <img width="1577" alt="Screenshot 2024-12-11 at 01 57 46"
src="https://github.com/user-attachments/assets/42926e84-7a7f-4692-af44-672b52d3d377">
| <img width="1577" alt="Screenshot 2024-12-11 at 01 58 37"
src="https://github.com/user-attachments/assets/ee8ab0ef-75af-424c-b916-9f1ce8b5264d">

Release Notes:

- N/A