Pure visual improvements to renderBiliChart. Interpolation, lookup
tables, and threshold math are all untouched.
AAP chart now has three-zone shading matching BiliTool's convention:
- Faint green tint below the phototherapy curve (safe zone)
- Amber band between phototherapy and exchange (treatment zone)
- Unshaded above the dashed crimson exchange line (danger)
Phototherapy line: solid orange 2.4 px; Exchange: dashed crimson.
renderBiliChart common improvements:
- Right-edge label on each threshold line ("Phototherapy", "Exchange",
or "95th (High-Risk)" for Bhutani) with white halo — identifiable
without a legend, like PediTools
- Legend removed (replaced by the inline labels)
- X-axis auto-ranges to fit the actual data with tick every 12 h
- Y-axis tick every 5 mg/dL for clean BiliTool-style gridlines
- 40 px right padding so labels don't clip
- Patient dot shrunk from r=8 to r=5 with a 1.8 px white ring,
redrawn on top of every label + its TSB value printed next to it
- Bhutani chart inherits all the same improvements without changing
its own zone/fill setup
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