Function humanTokens

internal/tui/format.go:16–25

humanTokens renders a token count compactly: `900 tok`, `1.2k tok`, `1.5M tok`. The k/M ranges always keep one decimal (`2.0k`, not `2k`) so the live counter holds a constant width as it ticks past round thousands: it reads `1.9k → 2.0k → 2.1k`, not a jumpy `1.9k → 2k → 2.1k`.

(n int)

// counter holds a constant width as it ticks past round thousands: it reads
// `1.9k → 2.0k → 2.1k`, not a jumpy `1.9k → 2k → 2.1k`.
func humanTokens(n int) string {
	switch {
	case n < 1000:
		return fmt.Sprintf("%d tok", n)
	case n < 1_000_000:
		return fmt.Sprintf("%.1fk tok", float64(n)/1000)
	default:
		return fmt.Sprintf("%.1fM tok", float64(n)/1_000_000)
	}
}

// liveElapsed renders a running wall clock duration for the status bar: whole
// seconds under a minute (no sub second decimal spinning at the spinner's