UX pass over PR description header area

Testing #253045

<img width="1015" alt="Image" src="https://github.com/user-attachments/assets/1de31303-c045-4eba-892d-77c84e8571c9" />

I am lost here, whats with all the buttons? Can we do a UX round on this editor?

//cc @mrleemurray 