Matthew Zeng 182000999c Raise welcome animation breakpoint to 37 rows (#9778)
### Motivation
- The large ASCII welcome animation can push onboarding content below
the fold on default-height terminals, making the CLI appear
unresponsive; raising the breakpoint prevents that.
- The existing test measured an arbitrary row count rather than
asserting the welcome line position relative to the animation frame,
which made the intent unclear.

### Description
- Increase `MIN_ANIMATION_HEIGHT` from `20` to `37` in
`codex-rs/tui/src/onboarding/welcome.rs` so the animation is skipped
unless there is enough vertical space.
- Replace the brittle measurement logic in the welcome render test with
a `row_containing` helper and assert the welcome row equals the frame
height plus the spacer line (`frame_lines + 1`).
- Add a regression test
`welcome_skips_animation_below_height_breakpoint` that verifies the
animation is not rendered when the viewport height is one row below the
breakpoint.

### Testing
- Ran formatting with `~/.cargo/bin/just fmt` which completed
successfully.
- Ran unit tests for the crate with `cargo test -p codex-tui --lib` and
they passed (unit test suite succeeded).
- Ran `cargo test -p codex-tui` which reported a failing integration
test in this environment because the test cannot locate the `codex`
binary, so full crate tests are blocked here (environment limitation).

------
[Codex
Task](https://chatgpt.com/codex/tasks/task_i_6973b0a710d4832c9ff36fac26eb1519)
2026-01-24 21:50:35 -08:00
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