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Marc-André Bombeck
0c99c27bfc
The min-to-max envelope shipped as a stacked pair: a transparent base at the bucket minimum plus a `max - min` delta above it. Stacked series are measured from zero — recharts derives a stacked axis domain from the stack offsets, whose baseline is 0 — so a chart asking for `dataMin - 10` resolved to -10 rather than to the bottom of the band. A session spent between 120 and 170 bpm was drawn on a -10 to 180 axis and the shape of the effort, which is the entire point of the curve, squashed into the top quarter of the plot. It only happened on the dense sessions the envelope gate lets through, which are the ones with the most shape to lose. The band is now one range area over the bucket's own `[min, max]` pair. No stack, so the domain stays on the bpm values that are in the data. The axis domain is computed rather than inferred, because the session's peak has to be inside it: recharts discards an out-of-range reference line instead of clamping it, and a reported peak is a single reading while the curve plots bucket means, so a peak marker over a data-derived domain would go missing on most sessions that have one. Adds that peak marker alongside the average one, both labelled, and reads the envelope back in the tooltip as the spread it is. The mapping moves into a pure module so the values the axis sees can be asserted without mounting recharts.