fix(today)：实时压力拖动，首尾吸附

@@ -389,6 +389,9 @@ class TodayHrvChartCard extends StatelessWidget {
           fontSize: 14,
           color: _getColorByState(state),
           fontWeight: FontWeight.bold,
+          inherit: false,
+          fontFamilyFallback: null,
+          fontFamily: '',
         ),
       ),
       TextSpan(
@@ -412,6 +415,9 @@ class TodayHrvChartCard extends StatelessWidget {
           color: Color(0xFF78787D),
           fontSize: 14,
           fontWeight: FontWeight.bold,
+          inherit: false,
+          fontFamilyFallback: null,
+          fontFamily: '',
         ),
       ),
       TextSpan(
@@ -430,6 +436,9 @@ class TodayHrvChartCard extends StatelessWidget {
       TextSpan(
         text: '○ ',
         style: TextStyle(
+          inherit: false,
+          fontFamilyFallback: null,
+          fontFamily: '',
           color: _getColorByState(state),
           // fontWeight: FontWeight.bold,
           fontSize: 14,
@@ -453,6 +462,9 @@ class TodayHrvChartCard extends StatelessWidget {
       TextSpan(
         text: '♥ ',
         style: const TextStyle(
+          inherit: false,
+          fontFamilyFallback: null,
+          fontFamily: '',
           color: Color(0xFF78787D),
           fontSize: 14,
           fontWeight: FontWeight.bold,
@@ -953,11 +965,58 @@ class _StressBarChartState extends State<_StressBarChart> {
                           event is FlPointerHoverEvent ||
                           event is FlPointerEnterEvent) {
                         _stressTooltipTimer?.cancel();
-                        if (touchResponse != null &&
-                            touchResponse.spot != null) {
+                        // 优先用触摸坐标直接定位最近的有数据的柱子
+                        // 不依赖 fl_chart 的 spot 检测（touchExtraThreshold 会导致总是找到 spot）
+                        final dx = event.localPosition?.dx;
+                        if (dx != null && slotStateMap.isNotEmpty) {
+                          final stepWidth = barWidth + groupsSpace;
+                          final touchedSlotSec =
+                              (dx / stepWidth).round() * slotSec;
+
+                          final sortedSlots = slotStateMap.keys.toList()
+                            ..sort();
+                          final firstSlot = sortedSlots.first;
+                          final lastSlot = sortedSlots.last;
+
+                          int? targetIndex;
+
+                          if (touchedSlotSec <= firstSlot) {
+                            // 超出左侧边界 → 吸附到第一条数据
+                            targetIndex = (firstSlot / slotSec)
+                                .round()
+                                .clamp(0, slotCount - 1);
+                          } else if (touchedSlotSec >= lastSlot) {
+                            // 超出右侧边界 → 吸附到最后一条数据（最新）
+                            targetIndex = (lastSlot / slotSec)
+                                .round()
+                                .clamp(0, slotCount - 1);
+                          } else {
+                            // 在数据范围内：仅在距最近数据点 ≤ 5 个槽（30min）时才吸附
+                            const snapThresholdSlots = 5;
+                            final nearestSlot = sortedSlots.reduce(
+                              (a, b) => (a - touchedSlotSec).abs() <
+                                      (b - touchedSlotSec).abs()
+                                  ? a
+                                  : b,
+                            );
+                            final distanceSlots =
+                                (nearestSlot - touchedSlotSec).abs() ~/ slotSec;
+                            if (distanceSlots <= snapThresholdSlots) {
+                              targetIndex = (nearestSlot / slotSec)
+                                  .round()
+                                  .clamp(0, slotCount - 1);
+                            }
+                            // 超过阈值（大片空白区域）→ targetIndex 保持 null，不显示
+                          }
+
+                          setState(() {
+                            _stressTouchedGroupIndex = targetIndex;
+                          });
+                        } else if (touchResponse?.spot != null) {
+                          // localPosition 不可用时降级到 fl_chart 的 spot
                           setState(() {
                             _stressTouchedGroupIndex =
-                                touchResponse.spot!.touchedBarGroupIndex;
+                                touchResponse!.spot!.touchedBarGroupIndex;
                           });
                         } else {
                           setState(() {