fix(today)：睡眠卡片默认8小时目标

@@ -33,11 +33,11 @@ class TodaySleepCard extends StatelessWidget {
                 ? '-'
                 : '${healthData?.hrAvg}';
         double sleepDurationProgress =
-            (activityTarget?.sleepTargetDuration ?? 0) == 0 ||
+            (activityTarget?.sleepTargetDuration ?? 28800) == 0 ||
                     sleepDuration == 0
                 ? -1
                 : ((healthData?.sleepDuration ?? 0) /
-                    (activityTarget?.sleepTargetDuration ?? 0) *
+                    (activityTarget?.sleepTargetDuration ?? 28800) *
                     360);
         double sleepScoreProgress =
             sleepDuration == 0 ? -1 : (healthData?.sleepScore ?? 0.0) * 3.6;