- Import fetchAdminTimezone + setAdminTimezone from api/client.js
- timezoneQuery: useQuery(['admin','timezone'], fetchAdminTimezone, retry:false, staleTime:60s)
- timezoneMutation: useMutation(setAdminTimezone) with invalidateQueries on success
- Timezone <section aria-label="Timezone"> after Shared Calendar (with marginBottom on preceding section)
- Searchable <input type=text list=iana-zones> + <datalist> from Intl.supportedValuesOf (guarded)
- 'Use detected: <zone>' affordance for D-02 one-tap seed
- 'Using system default' note when isExplicitlySet === false (D-06)
- Save button disabled while pending or when input equals stored value
- No touch to eventDateTime.ts / hydrateEvents.ts / other sections (D-07)
Lucas Berger
43d6689167