Parse the `d` attribute into an absolute-coordinate SvgPathSeg list,
lowering SVG shorthands to a small command set the painter can replay:
relative→absolute, H/V→lineTo, S→cubic and T→quad with control
reflection, arcs kept as arcTo. Tolerant — malformed tail returns the
understood prefix and never throws, so a bad diagram can't crash the
conversation. Flutter-free, covered by dart test. First slice of the SVG
engine (D-103); no user-visible behaviour yet.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
9cc3d68862