Polishes the right panel UI introduced in #22633:
<img width="3138" height="1596" alt="image"
src="https://github.com/user-attachments/assets/d3947db0-6600-4469-b7e2-6eb80aadb7bc"
/>
Over 2k lines of this is just the Seti font definition.
The file tree view isn't actually adjusting much, it's just a scroll
helper. Soon I'll add a comment system so users can leave agents
feedback directly from the code.
Kyle Carberry