/photos, /photos/exif and unified search take date_from_day /
date_to_day (YYYY-MM-DD): the server turns them into the first day's
start and the last day's end in the owner's display zone, the same days
/memories groups by. Each replaces its instant counterpart. Clients stop
computing midnights in the device's zone, which drifted by the travel
offset whenever the phone's zone differed from display_tz.
e2e check: every fixture is included by its display-zone day and
excluded by the days either side.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>