ReviewHeader
The review-document app header: an editable doc title, a DocStatus badge, live PresenceAvatars, and an actions cluster (Share, the side-rail toggle, and an overflow menu). Sticky, built on Navbar conventions but doc-specific. Presentational only — it composes existing @ocss/ds parts and carries no editor engine; the real editor wraps it upstream.
Full configuration — editable title, presence, all actions
The title click-swaps to an input (input-swap shell, no editor engine): Enter commits, Escape cancels. The panel toggle drives aria-pressed + aria-controls; the ⋯ menu is a full WAI-ARIA APG menu button (arrows / Home / End / Escape, outside-click close).
DocStatus — every status maps to a labelled badge
Read-only title, no presence, share only
With a leading slot (back affordance)