Replicates Notion's page layout from reference images: - Top bar: Private badge, Share button, Link copy, Star/favorite toggle, ⋮ menu - Share modal: Publish toggle, Copy link, Invite people with permission select - Empty page toolbar: Get started with H1/H2/H3/bullet/todo/callout/quote - Star toggle integrated with favorites API (POST/DELETE /board/api/favorites) - board.py view_page now passes workspace context + page_favorited - dashboard.py view_page_root also passes page_favorited - CSS: .page-topbar, .share-modal, .empty-page-toolbar, toggle switch, more menu