feat(auth): 预加载用户数据并优化登录状态同步

- 在启动屏预加载用户 token 与资料，避免首页白屏
- 新增 rehydrateUserSync 同步注入 Redux，减少异步等待
- 登录页兼容 ERR_REQUEST_CANCELED 取消场景
- 各页面统一依赖 isLoggedIn 判断，移除冗余控制台日志
- 步数卡片与详情页改为实时拉取健康数据，不再缓存至 Redux
- 后台任务注册移至顶层，防止重复定义
- 体重记录、HeaderBar 等 UI 细节样式微调

app/(tabs)/statistics.tsx

@@ -88,8 +88,6 @@ export default function ExploreScreen() {
 
   // 解构健康数据（支持mock数据）
   const mockData = useMockData ? getTestHealthData('mock') : null;
-  const stepCount: number | null = useMockData ? (mockData?.steps ?? null) : (healthData?.steps ?? null);
-  const hourlySteps = useMockData ? (mockData?.hourlySteps ?? []) : (healthData?.hourlySteps ?? []);
   const activeCalories = useMockData ? (mockData?.activeEnergyBurned ?? null) : (healthData?.activeEnergyBurned ?? null);
   const basalMetabolism: number | null = useMockData ? (mockData?.basalEnergyBurned ?? null) : (healthData?.basalEnergyBurned ?? null);
 
@@ -271,7 +269,6 @@ export default function ExploreScreen() {
         dispatch(setHealthData({
           date: dateString,
           data: {
-            steps: data.steps,
             activeCalories: data.activeEnergyBurned,
             basalEnergyBurned: data.basalEnergyBurned,
             hrv: data.hrv,
@@ -283,7 +280,6 @@ export default function ExploreScreen() {
             exerciseMinutesGoal: data.exerciseMinutesGoal,
             standHours: data.standHours,
             standHoursGoal: data.standHoursGoal,
-            hourlySteps: data.hourlySteps,
           }
         }));
 
@@ -541,11 +537,9 @@ export default function ExploreScreen() {
 
             <FloatingCard style={styles.masonryCard}>
               <StepsCard
-                stepCount={stepCount}
+                curDate={currentSelectedDate}
                 stepGoal={stepGoal}
-                hourlySteps={hourlySteps}
                 style={styles.stepsCardOverride}
-                onPress={() => pushIfAuthedElseLogin('/steps/detail')}
               />
             </FloatingCard>