Serialize canvas nodes into a versioned JSON payload carried on a
custom clipboard MIME type, with the same payload embedded in the
copied SVG markup as a text/html and text/plain fallback. Parsing
prefers the internal format over PNG previews and plain text, restores
path data from the SVG fallback, rejects malformed payloads, and
creates pasted nodes at the paste anchor without rasterizing them.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
