fix(historial): clamp sparkline bar height between 15-90% to prevent overflow

When range=0 (1 run or all same profit), use absolute scale with clamped heightPct

src/main/resources/templates/PageResource/historial.html

@@ -546,10 +546,12 @@
           if (!data.length) return [];
           const max = Math.max(...data.map(d => d.profit));
           const min = Math.min(...data.map(d => d.profit));
-          const range = Math.abs(max - min) || 1;
+          const range = Math.abs(max - min);
+          const useAbsoluteScale = range === 0 || max === 0;
+          const ref = useAbsoluteScale ? Math.max(Math.abs(max), 1) : range;
           return data.map(d => ({
             ...d,
-            heightPct: d.profit === 0 ? 5 : Math.max(10, Math.abs(d.profit) / range * 90)
+            heightPct: d.profit === 0 ? 50 : Math.max(15, Math.min(90, Math.abs(d.profit) / ref * 90))
           }));
         },