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
- calendar API: today/week ranges use Moscow time (UTC+3) instead of UTC — previously today events did not appear until 03:00 MSK
- settings tab: add -webkit-overflow-scrolling: touch + touchAction pan-y for tablet scroll
- NotesTab: add date picker (pinDate) in editor header + date badge in list
- home: pinnedNotes now filters by pinDate (today or future), falls back to latest
- notes/auth: storage moved from /tmp to /data (falls back to /tmp if /data missing)
- deploy workflow: mount /opt/digital-home/smart-home-tablet-data:/data so notes survive redeploys