Rewrote the SVG arc math — sweep=0 (counter-clockwise) correctly draws the
upper semicircle from left (30) over the top to right (70). The gauge now:
- Spans a fixed VO2 range of 30–70 across 180°
- Shows dimmed age/sex-specific ACSM category bands as background
- Fills a bright arc from 30 to the current value in the category colour
- Has a small triangular arrow pointer at the value position on the arc
- Shows the value number centred in the dome, coloured for its category
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
owain
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