Whether this is the board's active page.
Who CREATED the page. Drives the page strip's delegated-violet garnish for
agent-created pages (mirroring the item-level agent treatment). Persisted in the
v2 JSON as an additive author field; payloads without it rehydrate as 'user'.
Stable page id (e.g. page-2) — accepted anywhere a page name is accepted.
How many items live on the page (highlights included).
Display name (e.g. "Page 1"). Not guaranteed unique; IDs are.
Public, read-only descriptor of one board page — what WhiteboardState.Pages returns and what every page before/after event carries. A snapshot, not a live view: re-read WhiteboardState.Pages after mutations.