Fix VO2 gauge arc direction: sweep=1 for upper (top) semicircle

sweep=0 in SVG is counter-clockwise which goes through the bottom of the
circle. sweep=1 (clockwise) correctly traces left→top→right.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/pages/HealthPage.jsx

@@ -77,7 +77,7 @@ function Vo2MaxGauge({ value, birthYear, biologicalSex }) {
     const [x1, y1] = toXY(v1)
     const [x2, y2] = toXY(v2)
     const large = (v2 - v1) / (MAX - MIN) > 0.5 ? 1 : 0
-    return `M ${x1.toFixed(2)} ${y1.toFixed(2)} A ${r} ${r} 0 ${large} 0 ${x2.toFixed(2)} ${y2.toFixed(2)}`
+    return `M ${x1.toFixed(2)} ${y1.toFixed(2)} A ${r} ${r} 0 ${large} 1 ${x2.toFixed(2)} ${y2.toFixed(2)}`
   }
 
   // Category segment boundaries from the age/sex ACSM table