The builder ties the five parsers together: parseXml → inlineStyles →
a typed SvgNode tree (group/rect/ellipse/line/poly/path/text/image) with
viewBox, per-node Affine transforms, and inheritance-flattened SvgStyle
(fill/stroke/font resolved to ARGB; opacity per-node). Tolerant — a
non-svg root yields an empty doc; defs/marker deferred. An end-to-end test
runs the whole pipeline against a real d2-rendered SVG fixture. Flutter-
free, covered by dart test (17 cases). No user-visible behaviour yet.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>