Reduced reference curves from 9 to 7 (dropped 5th and 95th — they
crowd the 3rd/10th and 90th/97th labels on small screens without
adding clinical value; 3rd and 97th are the US/WHO standard
abnormal thresholds).
Each percentile now gets a distinct hue:
3rd red 50th green (bold) 90th violet
10th orange 75th blue 97th pink
25th amber (3rd/97th dashed)
Label plugin improvements:
- Bolder 11px font (was 10px)
- White halo stroke behind text so labels stay legible when the
line they sit on is also colored
- Vertical nudge when two labels would overlap — keeps adjacent
percentiles readable on mobile aspect ratios
- Solid fill color (strips alpha from borderColor)
Patient dot:
- Moved to order: -1 (drawn on top of everything, including labels
and fill bands)
- White 2.5px border ring so it's visible even when it lands
exactly on a colored curve
- Slightly larger hover radius (11 → was 10)
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