- New per-user 'week_start' setting (0=Sun default / 1=Mon), registered in
USER_SETTING_KEYS + USER_SETTING_DEFAULTS.
- CalendarPage reads it and offsets the month grid: leading-blank count
(getDay()-weekStart+7)%7 and a rotated weekday header. Purely presentational.
- Settings: Sun/Mon Select in the new "Regional" section. Also aligns the
grace_period_days client default (3→5) with the server seed.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
- Header "Export" menu: Export CSV (via the existing /api/export?from&to date
range for the viewed month) and Print (window.print()). Extract the shared
downloadFile blob helper to lib/download.ts (reused by DownloadMyDataSection).
- Add api.exportRangeUrl(from, to, fmt).
- Tracker-scoped @media print CSS: hide interactive chrome (.tracker-print-hide),
keep the month title + summary + buckets, avoid splitting a row across pages.
- Header "Calendar" button deep-links to /calendar?year&month; CalendarPage now
reads those params as its initial month (falls back to today).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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