feat(desktop): per-turn usage pill in the status bar#3127
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…tion ↻cache) The status bar showed session-aggregate cache-hit % and the running turn's wall-clock + token count, but the actual per-turn prompt/completion/cache numbers were only visible by digging into the WireUsage payload in devtools. For a cost-aware user (especially on DeepSeek where cache hits are 90% cheaper than misses) the billable numbers deserve a permanent place. Add components/UsageIndicator.tsx: a 3-cell pill that mounts in the status bar to the right of the cache-hit %. Each cell is a tiny caption + value pair: ↑ 1.2k prompt tokens this turn ↓ 280 completion tokens this turn ↻ 850 cache-hit tokens (only rendered when > 0) The values are k-rounded (1.2k / 18k / 0) to keep the bar compact. The cache cell uses the existing --add-fg token so the green cue matches the rest of the UI. A real sparkline (per-turn history) needs a separate ring buffer in the controller — the WireUsage payload only carries the latest turn. That's a follow-up; the pill is the immediate win and the sparkline is a drop-in upgrade. StatusBar.tsx mounts the pill when usage is present (the controller dispatches a usage event on every model step, so the pill ticks as the turn progresses).
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The status bar showed session-aggregate cache-hit % and the running turn's wall-clock + token count, but the actual per-turn prompt/completion/cache numbers were only visible by digging into the WireUsage payload in devtools. For a cost-aware user the billable numbers deserve a permanent place.
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components/UsageIndicator.tsx: a 3-cell pill that mounts in the status bar:↑ 1.2k prompt tokens this turn
↓ 280 completion tokens this turn
↻ 850 cache-hit tokens (only rendered when > 0)
The values are k-rounded to keep the bar compact. The cache cell uses --add-fg so the green cue matches the rest of the UI.