A multi-day event repeated the same "start – end" on every day it spans
("14:00 – 14:00"), which reads as meaningless. Show only the part
relevant to each day, with a "→" marking that it carries past the day's
boundary: the first day shows the start ("14:00 →"), the last day the
end ("→ 10:00"), and whole days in between an all-day span arriving from
and continuing into their neighbours ("→ All day →"). Single-day rows are
unchanged.
Factors the span first/last-day resolution into shared EventInstance
helpers reused by groupAgendaDays and the label.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Jean-Luc Makiola
3feafe38f2