feat(tui): add /usage stats screen with Overview and Models subviews#3
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Adds a terminal-first stats screen reachable via /usage (alias /stats). The screen renders a GitHub-style year heatmap plus KPI block on the Overview tab, and a stacked per-day tokens chart with per-model breakdown on the Models tab. Date range (All time, Last 7 days, Last 30 days) cycles with `r` and filters all KPIs; the heatmap stays year-wide to match the mockup. ctrl+s copies a plain-text summary to the clipboard. Pure derivation logic lives in util/usage-stats.ts and is covered by unit tests.
- hoist HEIGHT/ROW_INDICES/LEGEND_LEVELS out of render to avoid allocating fresh arrays every frame - render the heatmap month header as a single <text> instead of one element per character - drop the unused `filtered`/`range` props from Overview and the unused `sub` branch from summarizeStats - fold the two identical formatMultiplier branches - replace the redundant `const assistant = msg` alias in recordsFromMessages - deduplicate `selectedForeground` into one `contrastingFg` helper - remove the undocumented `q` keybind so only the footer hints are live (escape still exits)
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Adds a terminal-first stats screen reachable via /usage (alias /stats).
The screen renders a GitHub-style year heatmap plus KPI block on the
Overview tab, and a stacked per-day tokens chart with per-model
breakdown on the Models tab. Date range (All time, Last 7 days, Last 30
days) cycles with
rand filters all KPIs; the heatmap staysyear-wide to match the mockup. ctrl+s copies a plain-text summary to
the clipboard. Pure derivation logic lives in util/usage-stats.ts and
is covered by unit tests.