All-day: a single-day all-day event displayed across two days. iCal all-day
DTEND is EXCLUSIVE (1-day event = DTSTART:24/DTEND:25) and the server occurrence
carries that exclusive end, but Schedule-X treats all-day end as INCLUSIVE.
hydrateEvents now subtracts one day (clamped to >= start) so a 1-day event shows
on one day and an N-day event spans N days. Write path was already correct
(verified against stored VEVENTs). +regression test.
Color: a member's coral (#E8734A) was mistaken for the shared-family rose
(#F25C7A). Reorder COLOR_PALETTE so warm near-rose hues (amber, coral) are
assigned LAST; early members get cool, clearly-distinct colors (blue/green/teal).