SvgImage: wrapper for rendered SVG output

Returned by [render_share_distribution()] and [render_cluster_heatmap()]. Mirrors the Python `SvgImage` dataclass so cross-package parity tests can use a uniform attribute name (`content`). Note that [render_venn_svg()] still returns a plain `character` for backward compatibility with the v2.0.x public API; the new plot renderers return `SvgImage` so callers can introspect explicit `width` / `height` extents.

Slots

content

The SVG document as a string.

width

Pixel width of the rendered SVG.

height

Pixel height of the rendered SVG.