feat(app): 睡眠报告入睡时间调整

@@ -905,6 +905,9 @@ class _BedtimeChart extends StatefulWidget {
 }
 
 class _BedtimeChartState extends State<_BedtimeChart> {
+  static const _xAxisLeftInset = 10.0;
+  static const _xAxisRightInset = 40.0;
+
   int? _selectedDayIndex;
   Timer? _tooltipTimer;
 
@@ -985,12 +988,12 @@ class _BedtimeChartState extends State<_BedtimeChart> {
   }
 
   double _lineXForDay(double width, int dayIndex) {
-    return _barCenterForIndex(
-      dayIndex,
-      width,
-      widget.days.length,
-      widget.compact,
-    );
+    final count = widget.days.length;
+    if (count <= 1 || width <= _xAxisLeftInset + _xAxisRightInset) {
+      return width / 2;
+    }
+    final dataWidth = width - _xAxisLeftInset - _xAxisRightInset;
+    return _xAxisLeftInset + dataWidth * dayIndex / (count - 1);
   }
 
   LineChartData _chartData(
@@ -1044,18 +1047,11 @@ class _BedtimeChartState extends State<_BedtimeChart> {
     }
 
     final count = widget.days.length;
-    final dataMaxX = count <= 1 ? 0.0 : (count - 1).toDouble();
-    final horizontalInset = count <= 1
-        ? chartWidth / 2
-        : _barCenterForIndex(0, chartWidth, count, widget.compact);
-    final dataWidth = chartWidth - horizontalInset * 2;
-    final xPadding = count <= 1 || dataWidth <= 0
-        ? 0.5
-        : horizontalInset * (count - 1) / dataWidth;
+    final xBounds = _xBounds(chartWidth, count);
 
     return LineChartData(
-      minX: -xPadding,
-      maxX: dataMaxX + xPadding,
+      minX: xBounds.minX,
+      maxX: xBounds.maxX,
       minY: 0,
       maxY: _tooltipChartMaxY,
       gridData: const FlGridData(show: false),
@@ -1084,12 +1080,7 @@ class _BedtimeChartState extends State<_BedtimeChart> {
 
   void _selectSpotAt(double dx, double chartWidth) {
     _tooltipTimer?.cancel();
-    final index = _barIndexForTouch(
-      dx,
-      chartWidth,
-      widget.days.length,
-      widget.compact,
-    );
+    final index = _dayIndexForTouch(dx, chartWidth);
     final hasData = index != null &&
         widget.days[index].hasSleepData &&
         widget.days[index].heartRate.sleepStart != null;
@@ -1098,6 +1089,38 @@ class _BedtimeChartState extends State<_BedtimeChart> {
     setState(() => _selectedDayIndex = nextIndex);
   }
 
+  ({double minX, double maxX}) _xBounds(double width, int count) {
+    if (count <= 1 || width <= _xAxisLeftInset + _xAxisRightInset) {
+      return (minX: -0.5, maxX: 0.5);
+    }
+    final scale = (count - 1) / (width - _xAxisLeftInset - _xAxisRightInset);
+    return (
+      minX: -_xAxisLeftInset * scale,
+      maxX: count - 1 + _xAxisRightInset * scale,
+    );
+  }
+
+  int? _dayIndexForTouch(double? dx, double width) {
+    final count = widget.days.length;
+    if (dx == null || width <= 0 || count <= 0) return null;
+    if (count == 1 || width <= _xAxisLeftInset + _xAxisRightInset) {
+      return dx <= width - _xAxisRightInset ? 0 : null;
+    }
+    final dataWidth = width - _xAxisLeftInset - _xAxisRightInset;
+    final firstX = _xAxisLeftInset;
+    final lastX = width - _xAxisRightInset;
+    final step = dataWidth / (count - 1);
+    final minTouchX = (firstX - step / 2).clamp(0, width).toDouble();
+    final maxTouchX = (lastX + step / 2)
+        .clamp(0, width - _ChartPlotFrame.rightAxisWidth)
+        .toDouble();
+    if (dx < minTouchX || dx > maxTouchX) return null;
+    return ((dx - _xAxisLeftInset) / dataWidth * (count - 1))
+        .round()
+        .clamp(0, count - 1)
+        .toInt();
+  }
+
   void _scheduleTooltipDismissal() {
     if (_selectedDayIndex == null || widget.tooltipAutoDismissMs <= 0) return;
     _tooltipTimer?.cancel();
@@ -1588,7 +1611,9 @@ class _ChartPlotFrame extends StatelessWidget {
           padding: EdgeInsets.only(
             top: topInset,
             left: insetChildHorizontally ? horizontalInset : 0,
-            right: insetChildHorizontally ? rightAxisWidth : 0,
+            right: insetChildHorizontally
+                ? rightAxisWidth
+                : 0,
           ),
           child: child,
         ),