A minimap whose viewport rectangle is physically wired to the real viewport by a live SVG pantograph (two elbow arms solved by two-bar IK every frame), so dragging the small handle visibly swings and extends the linkage as the document pans, making the scale ratio legible instead of implied.
pnpm dlx shadcn@latest add "https://design.helpmarq.com/r/minimap-pantograph.json"