fix(ui): ExportMenu PNG export creates a blank canvas — target element is never rendered into bitmap #412
Description
Summary
The PNG export path in ExportMenu.tsx creates a fresh <canvas> and draws only a background colour and header text. targetRef.current (the actual dashboard element) is never rendered into the canvas. Downloaded PNGs contain only the background and title, missing all dashboard content.
Affected file
src/UILayer/web/src/components/shared/ExportMenu.tsx — line 83
Required fix
Use a library such as html2canvas or dom-to-image to capture the targetRef.current DOM node into the canvas, rather than drawing a blank canvas manually.