/** * Compact Export control for the editor chrome's top-right slot. A single * button opens a small popover to choose format (PNG/JPEG) and scale (1x/2x); * confirming calls `onExport({ format, pixelRatio })`. * * The chrome is Konva-free, so this control does NOT render the image — it only * collects the format/scale and delegates to the workspace (which owns the * stage) via the callback the DesignCanvas shell wires through `onExportRef`. * * Tokens/glyphs follow the canvas convention: CSS-var design tokens and inline * SVG glyphs, no icon-library or browser-default `