/settings/household edits the time zone (a searchable IANA list with each
zone's current UTC offset), dinner time, day-of reminder, rotation check,
and the plan draft, new suggestions and Google Chat Supply run day and
time, with plain-word copy for each and "Changes apply to everyone in the
household." Save PATCHes only the changed fields; the API's
invalid_settings problems show under their fields. The leave guard and
confirm sheet move out of the AI settings page so both screens share them.
Maestro task 48f8b8c3-7d5c-415d-9a61-980dc065bb90.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
