refactor: 重构提醒通知系统

apps/lib/features/calendar/presentation/dayweek/day_timeline_metrics.dart

@@ -9,6 +9,7 @@ class DayTimelineMetrics {
   static const double timeLabelGap = 8;
   static const double eventRightInset = 4;
   static const double eventColumnGap = 4;
+  static const double minEventCardWidth = 30;
 
   static double timelineHeight(DayViewScale scale) {
     return scale.pixelsForMinutes(minutesInDay);
@@ -20,10 +21,10 @@ class DayTimelineMetrics {
 
   static double eventAreaWidth(double boardWidth) {
     final width = boardWidth - eventAreaLeft() - eventRightInset;
-    return width > 0 ? width : 0;
+    return width < 0 ? 0 : width;
   }
 
   static int clampMinuteOfDay(int minute) {
-    return minute.clamp(0, minutesInDay).toInt();
+    return minute.clamp(0, minutesInDay);
   }
 }