Preview docs as any viewer role before publishing

Preview docs as a role

Teams can now preview a role-gated docs site as a specific viewer to validate their gating before publishing. On a preview link, a role selector lets you pick one or more roles (or anonymous) and re-renders the site with that viewer's role-based visibility applied, including nav pruning, <If /> blocks, and role-gated tabs and products. With no selection, the preview continues to show all content.