Fix y-axis range min/max value logic

src/components/simulation-chart.tsx

@@ -76,10 +76,48 @@ const SimulationChart = ({
   const chartDomain = React.useMemo(() => {
     const numMin = parseFloat(yAxisMin);
     const numMax = parseFloat(yAxisMax);
-    const domainMin = !isNaN(numMin) ? numMin : 'auto';
-    const domainMax = !isNaN(numMax) ? numMax : 'auto';
+
+    // Calculate actual data range if auto is needed
+    let dataMin = Infinity;
+    let dataMax = -Infinity;
+
+    if (isNaN(numMin) || isNaN(numMax)) {
+      // Scan through combined profile data to find actual min/max
+      combinedProfile?.forEach((point: any) => {
+        if (chartView === 'damph' || chartView === 'both') {
+          dataMin = Math.min(dataMin, point.damph);
+          dataMax = Math.max(dataMax, point.damph);
+        }
+        if (chartView === 'ldx' || chartView === 'both') {
+          dataMin = Math.min(dataMin, point.ldx);
+          dataMax = Math.max(dataMax, point.ldx);
+        }
+      });
+
+      // Also check template profile if shown
+      templateProfile?.forEach((point: any) => {
+        if (chartView === 'damph' || chartView === 'both') {
+          dataMin = Math.min(dataMin, point.damph);
+          dataMax = Math.max(dataMax, point.damph);
+        }
+        if (chartView === 'ldx' || chartView === 'both') {
+          dataMin = Math.min(dataMin, point.ldx);
+          dataMax = Math.max(dataMax, point.ldx);
+        }
+      });
+
+      // Add small padding (5% on each side) for better visualization
+      const range = dataMax - dataMin;
+      const padding = range * 0.05;
+      dataMin = Math.max(0, dataMin - padding); // Don't go below 0
+      dataMax = dataMax + padding;
+    }
+
+    const domainMin = !isNaN(numMin) ? numMin : (dataMin !== Infinity ? Math.floor(dataMin) : 0);
+    const domainMax = !isNaN(numMax) ? numMax : (dataMax !== -Infinity ? Math.ceil(dataMax) : 100);
+
     return [domainMin, domainMax];
-  }, [yAxisMin, yAxisMax]);
+  }, [yAxisMin, yAxisMax, combinedProfile, templateProfile, chartView]);
 
   // Check which days have deviations (differ from template)
   const daysWithDeviations = React.useMemo(() => {