Adds a draw mode toggle (pencil icon, shortcut D) that reveals a
bottom toolbar with freeform pen and shape tools (rectangle, ellipse,
triangle, star), a colour picker, line-width spinner, undo (Ctrl+Z),
clear-all, and a "Save Copy…" button that exports a flattened PNG.
Copying to clipboard (Ctrl+C) also flattens the annotations when any
strokes are present. Strokes are stored in image-pixel coordinates and
rendered via a Cairo overlay in the snapshot pipeline, so they remain
correctly positioned during zoom and pan.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Lazzexus
2ce31a1a30