feat(challenges): 登录态守卫与进度条动画优化

- 在 _layout 中仅当已登录时才拉取挑战列表，避免未授权请求
- 挑战详情页加入 ensureLoggedIn 守卫，未登录时跳转登录
- ChallengeProgressCard 新增分段进度动画，提升视觉反馈
- 升级版本号至 1.0.15

app/_layout.tsx

@@ -14,18 +14,19 @@ import { setupQuickActions } from '@/services/quickActions';
 import { initializeWaterRecordBridge } from '@/services/waterRecordBridge';
 import { WaterRecordSource } from '@/services/waterRecords';
 import { store } from '@/store';
-import { fetchChallenges } from '@/store/challengesSlice';
 import { fetchMyProfile, setPrivacyAgreed } from '@/store/userSlice';
 import { createWaterRecordAction } from '@/store/waterSlice';
 import { ensureHealthPermissions, initializeHealthPermissions } from '@/utils/health';
 import { DailySummaryNotificationHelpers, MoodNotificationHelpers, NutritionNotificationHelpers } from '@/utils/notificationHelpers';
 import { clearPendingWaterRecords, syncPendingWidgetChanges } from '@/utils/widgetDataSync';
-import React from 'react';
+import React, { useEffect } from 'react';
 
 import { DialogProvider } from '@/components/ui/DialogProvider';
 import { ToastProvider } from '@/contexts/ToastContext';
+import { useAuthGuard } from '@/hooks/useAuthGuard';
 import { STORAGE_KEYS } from '@/services/api';
 import { BackgroundTaskManager } from '@/services/backgroundTaskManager';
+import { fetchChallenges } from '@/store/challengesSlice';
 import AsyncStorage from '@/utils/kvStore';
 import { Provider } from 'react-redux';
 
@@ -34,10 +35,17 @@ function Bootstrapper({ children }: { children: React.ReactNode }) {
   const dispatch = useAppDispatch();
   const { profile } = useAppSelector((state) => state.user);
   const [showPrivacyModal, setShowPrivacyModal] = React.useState(false);
+  const { isLoggedIn } = useAuthGuard()
 
   // 初始化快捷动作处理
   useQuickActions();
 
+  useEffect(() => {
+    if (isLoggedIn) {
+      dispatch(fetchChallenges());
+    }
+  }, [isLoggedIn]);
+
   React.useEffect(() => {
     const loadUserData = async () => {
       // 数据已经在启动界面预加载，这里只需要快速同步到 Redux 状态
@@ -128,7 +136,8 @@ function Bootstrapper({ children }: { children: React.ReactNode }) {
     loadUserData();
     initHealthPermissions();
     initializeNotifications();
-    dispatch(fetchChallenges());
+
+
     // 冷启动时清空 AI 教练会话缓存
     clearAiCoachSessionCache();