Accepts any subset of the sections returned by GET /groups/{group_id}/settings.
Each section is independently optional — sending only meeting updates only
meeting fields. Within a section, only properties that are explicitly set are
persisted. Returns the full updated settings shape on success.
Concurrency model: last-write-wins (no optimistic-locking version field).
Authorization: caller must have canEditGroup. Group Leaders are blocked
(403) from writing the privileges, organization, or attendance_grouping_ids
sections — those require admin / department-admin / master-admin rights.
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Returns the full updated settings payload — same shape as
GET /groups/{group_id}/settings.
Not authenticated
Caller lacks canEditGroup, or Group Leader attempted to write a privileged section
Group not found