editAllDayEvent method
Fires PlannerConfig.onEntryEdit for an all-day chip — the band's
counterpart to editEvent, reached by double-tap, the context menu, or the
chip's a11y "activate" action (#72). All-day chips have no time axis, so
(unlike timed events) they expose no move/nudge — only edit and delete.
Implementation
void editAllDayEvent(AllDayEvent<T> chip) =>
config.onEntryEdit?.call(chip.entry);