Requiring both ends to sit exactly on midnight was too strict. A holiday stored
as the 16th at 00:00 through the 21st at 01:00 slipped through and rendered as
a one-hour slot. Starting on a day boundary and running into a later day is
enough to call it all-day.
The agenda row now names the weekday on both sides when an event crosses a day.
Showing only "00:00 – 01:00" for something that runs from Wednesday to Monday
is true and useless.
The timezone handling above this is deliberately untouched: timed events show
the right time, so the UTC assumption for timestamps without an offset is not
what produced the odd hour.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
ScarriffleandClaude Opus 5
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