Function BandChart

A variance-band draw layer: fills the envelope between the lower and upper columns of series (typically rollingByColumn percentiles), gap-aware, and registers itself into the enclosing Layers. Renders nothing to the DOM — the row draws it.

Compose two for a two-tone spread — author the wider band first so it sits behind (declaration order = z-order, back-to-front), then the line on top:

<Layers>
  <BandChart series={s} lower="p5"  upper="p95" as="outer" />
  <BandChart series={s} lower="p25" upper="p75" as="inner" />
  <LineChart series={s} column="p50" />
</Layers>
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