tldraw-mods: Offline Add-ons for tldraw

Field notes

The system treats a drawing as a package that can contain its own extensions: users initialize a local folder, add named mods, and carry the resulting components inside the `.tldraw` file. The documented set includes a resizable web-page shape, zoom-stable named landmarks, a ⌘K command bar, and replacement toolbar icons. Installation requires Node.js 20 or later and the tldraw offline app; the page also notes that the project is not affiliated with tldraw.