Updates a node’s type, position, or data. Only provided fields are changed.
Pass your API key (prefixed cgk_) or a Supabase JWT in the
Authorization: Bearer <token> header.
Board UUID.
"a1b2c3d4-e5f6-7890-abcd-ef1234567890"
Node UUID.
"e5f6a7b8-c9d0-1234-efab-345678901234"