Correctly round same-month day durations#361
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Relative date labels around the month boundary can currently move backward in precision: a 25-day-old timestamp may render as "last month" while a 27-day-old timestamp renders as "27 days ago". In sorted date lists this makes newer items look older than later rows, even when the underlying timestamps are ordered correctly. Keep same-calendar-month day spans in days instead of promoting them through the intermediate four-week representation to one month. Preserve month rounding once the compared dates cross a calendar-month boundary. Add regression coverage for the 25/26-day same-month cases so the labels remain monotonic around the month boundary.
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Summary
Avoid rounding same-calendar-month spans like 25 or 26 days to one month via the intermediate 4-week representation.
Before this change, relative durations could move backward in precision around the month boundary:
After this change, day-only spans remain in days until they cross the calendar-month boundary.
Test plan
npm test