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Google Calendar API rejects all-day events where start.date == end.date
(end is exclusive). POST/PUT were sending the same date for both,
producing Invalid start time when toggling Весь день on edit.
- Added nextDayISO helper (UTC-safe +1d arithmetic)
- all-day: start = { date }, end = { date: nextDay, dateTime: null }
- timed: also explicitly nulls start.date/end.date so patching a
timed-only event over a previously all-day one doesnt leave stale
date fields that also trigger Invalid start time