Automatic covers for pages, and 32 new covers

New pages get one of Markdrop's covers by themselves: AI reads the title and the first lines and picks one, or the page's words are matched when AI is off. It fades in a moment after the page opens. An untitled, empty page gets its cover once you've named it and started writing.
32 new covers, for roadmaps, meetings, releases, research, design, runbooks, people, finance, marketing, legal, support, data, security, docs and more, in a new Shapes group. Pick for me in the cover picker chooses one for the page.
An automatic cover says Auto when you hover it. Remove is one click, and a removed cover is never added back. A duplicate keeps its original's cover; templates and encrypted pages never get one.
Auto covers on the workspace settings' Advanced tab, next to AI features, turns it off for a workspace.
Pages made before this got a cover the same way, once.
MCP: create_page picks a cover (auto_cover, default true) and says which in cover; set_page_properties with cover: "auto" picks one again. See Automatic covers.