feat(tui): show elapsed time while a turn is still running

[BunsDev]

What

The status row already says a turn is alive, twice — a spinner and a shimmer sweep over the label. Neither answers the question someone waiting actually has: has this been running four seconds, or four minutes?

⠋ Generating… · 12s

The number already existed

turn_start is set at the top of every turn and format_elapsed_ms renders it — but it was only read after the turn finished, for the ✓ Worked for 2m 5s · done line. The duration was shown exactly when it had stopped mattering.

format_elapsed_ms becomes pub(crate), matching format_duration_secs directly below it, so the renderer shares the same formatting instead of growing a second one that rounds differently.

What I deliberately did not port

The sibling implementation in coven draws a ramped progress sweep alongside its elapsed counter. That made sense there because its status bar had only a spinner.

This status row already has shimmer_spans doing exactly that job. A second travelling effect beside it would be noise, not information. So only the half that adds information is carried across.

Tests

Three, against render_status_row through a TestBackend:

• a running turn reports its elapsed time, and the existing status label survives
• no separator is drawn when no turn is timed
• the idle branch's completed-turn summary (Worked for 2m 5s · done) is untouched — the live counter must not displace a different branch

Verification

cd src-rust
cargo fmt --all -- --check                               # clean
cargo clippy --workspace --all-targets -- -D warnings    # clean
cargo test --workspace                                   # 32 suites, 0 failures

Manual TUI check per AGENTS.md, tmux 80x24 — app starts clean, welcome box intact, and the strings scripts/tui-tests/cases/02_startup.sh pins (Coven v, Tips for getting started, What's new, ❯) all still render.

One limit worth stating: the status row only appears during a real model turn, so I could not observe the live counter in tmux without spending a turn. The three unit tests render that row directly and are the actual coverage for it.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
docs	Ready	Preview	Sep 16, 2026 1:10pm UTC