Fix various issues with pharmacokinetics, improved parameters, distinction between adult/child

src/components/simulation-chart.tsx

@@ -209,12 +209,10 @@ const chartDomain = React.useMemo(() => {
     // User set yAxisMax explicitly - use it as-is without padding
     domainMax = numMax;
   } else if (dataMax !== -Infinity) { // data exists
-    // No padding needed since it seems to be added automatically by Recharts
-    // // Auto mode: add 5% padding above
-    // const range = dataMax - dataMin;
-    // const padding = range * 0.05;
-    // domainMax = dataMax + padding;
-    domainMax = dataMax;
+    // Auto mode: add 5% padding above
+    const range = dataMax - dataMin;
+    const padding = range * 0.05;
+    domainMax = dataMax + padding;
   } else { // no data
     domainMax = 100;
   }