Workspace templates: use any page as a template

⋯ › Use as template on any page: choose Everyone in your workspace or Just me, a name, a description and an emoji, and whether to include the sub-pages you can open. Images are copied with it.
New page and Add a sub-page show your workspace's templates first, then yours, then the built-in ones, each with a preview.
A folder's default template: admins choose what New page in a folder starts from, like a PRD template in product-hub/02-prds. Anyone can still pick Blank or another template.
Placeholders: {{title}}, {{date}}, {{author}} and {{folder}} become the page's title, the day, the person making it and its folder.
Manage templates: rename, edit (a template is a page, in the same editor), delete, and drag to reorder. Admins manage the workspace's templates; members can rename or delete the ones they saved. Editing a template never changes pages already made from it.
Templates never show up in lists, search, the sidebar, folder pages or AI apps' document search. Viewers and people outside the workspace never see them.
AI apps: list_page_templates (optionally for one workspace) lists them with ids, create_page takes a template's id or slug, set_page_properties with template turns a page into a template and back, and the new save_page_as_template and set_folder_default_template save one and set a folder's default.