## What changed
- Render a rotating Codex logo in unused space above the composer on fresh conversations, without moving content or the cursor.
- Fade and pause the logo while drafting or unfocused, hide it on alternate views, and dismiss it after submission or conversation activity. Respect disabled animations and stop after three rotations with a fade out.
- Replace the onboarding ASCII frame variants with the shared logo renderer, retaining a faded logo after the animation ends and allowing the existing shortcut to replay it.
## Testing
Add rendering and integration tests for logo placement, visibility, pause/resume timing, completion, and preservation of the draft, cursor, header, and footer. Add snapshots for fresh conversations and the onboarding welcome layout.
GitOrigin-RevId: b98c7dd10acea3ef25d6c1495ed22c24202d6280
This is a follow-up to https://github.com/openai/codex/pull/15922. That
previous PR deleted the old `tui` directory and left the new
`tui_app_server` directory in place. This PR renames `tui_app_server` to
`tui` and fixes up all references.
This is the part 1 of 2 PRs that will delete the `tui` /
`tui_app_server` split. This part simply deletes the existing `tui`
directory and marks the `tui_app_server` feature flag as removed. I left
the `tui_app_server` feature flag in place for now so its presence
doesn't result in an error. It is simply ignored.
Part 2 will rename the `tui_app_server` directory `tui`. I did this as
two parts to reduce visible code churn.
Eric Traut