🚧 Note Shape

A note (sticky-note) shape would be a fixed-size coloured card that auto-sizes its text — the staple of brainstorming boards.

Planned — not yet available as a built-in element type.

Adjacent capabilities that exist today: TextElement for plain text content, TemplateElement for host-defined card components, and the annotation/comment layer in @oh-just-another/scene (Annotation, Comment, addAnnotation) for pinned discussion. A sticky note could be built as a TemplateElement until a first-class note type ships.