This sets up the scaffolding and basic flow for a TUI onboarding experience. It covers sign in with ChatGPT, env auth, as well as some safety guidance. Next up: 1. Replace the git warning screen 2. Use this to configure default approval/sandbox modes Note the shimmer flashes are from me slicing the video, not jank. https://github.com/user-attachments/assets/0fbe3479-fdde-41f3-87fb-a7a83ab895b8