Group the range options into calendar-aligned (today / this week / this
month) and rolling (next 7 / 30 days / custom) lists. Add a header showing
the concrete span currently in effect — a single date for Today, the month
and year for This month, otherwise a start–end span — so it's clear what
the agenda is showing. The header appears only where a window is supplied
(the agenda pill), not in Settings.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>