- analyze-sessions.mjs: track per-session start/end/tokens and emit
by_day[] in JSON output (date, dow, tokens, peak concurrency,
per-session spans). Hoist shared token-sum in commit loop.
- template.html: new "session timeline by day" section — horizontal
day pills (% of total + session count) drive a lane-packed gantt of
concurrent sessions, colored by project, with hover details and
←/→ keyboard nav. Extract drillList() helper and use it for both
top-prompts and cache-breaks (5 visible + "show more" toggle).
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