fix(today)：去除chart Y轴限制

@@ -605,7 +605,7 @@ class _HrvLineChartState extends State<_HrvLineChart> {
             tooltipBorder: BorderSide.none,
             maxContentWidth: 400,
             fitInsideHorizontally: true,
-            fitInsideVertically: true,
+            fitInsideVertically: false,
             getTooltipColor: (touchedSpot) => const Color(0xFFF3F3F3),
             tooltipPadding: const EdgeInsets.only(
               left: 12,
@@ -923,7 +923,7 @@ class _StressBarChartState extends State<_StressBarChart> {
                       tooltipBorder: BorderSide.none,
                       maxContentWidth: 400,
                       fitInsideHorizontally: true,
-                      fitInsideVertically: true,
+                      fitInsideVertically: false,
                       getTooltipColor: (touchedSpot) => const Color(0xFFF3F3F3),
                       tooltipPadding: const EdgeInsets.only(
                         left: 12,