feat(auth): 为未登录用户添加登录引导界面

为目标页面、营养记录、食物添加等功能添加登录状态检查和引导界面，确保用户在未登录状态下能够获得清晰的登录提示和指引。

- 在目标页面添加精美的未登录引导界面，包含渐变背景和登录按钮
- 为食物记录相关组件添加登录状态检查，未登录时自动跳转登录页面
- 重构血氧饱和度卡片为独立数据获取，移除对外部数据依赖
- 移除个人页面的实验性SwiftUI组件，统一使用原生TouchableOpacity
- 清理统计页面和营养记录页面的冗余代码和未使用变量

app/(tabs)/statistics.tsx

@@ -20,7 +20,6 @@ import { fetchTodayWaterStats } from '@/store/waterSlice';
 import { getMonthDaysZh, getTodayIndexInMonth } from '@/utils/date';
 import { fetchHealthDataForDate, testHRVDataFetch } from '@/utils/health';
 import { getTestHealthData } from '@/utils/mockHealthData';
-import { calculateNutritionGoals } from '@/utils/nutrition';
 import dayjs from 'dayjs';
 import { LinearGradient } from 'expo-linear-gradient';
 import { debounce } from 'lodash';
@@ -92,8 +91,6 @@ export default function ExploreScreen() {
   const activeCalories = useMockData ? (mockData?.activeEnergyBurned ?? null) : (healthData?.activeEnergyBurned ?? null);
   const basalMetabolism: number | null = useMockData ? (mockData?.basalEnergyBurned ?? null) : (healthData?.basalEnergyBurned ?? null);
 
-  const oxygenSaturation = useMockData ? (mockData?.oxygenSaturation ?? null) : (healthData?.oxygenSaturation ?? null);
-
 
 
   // 用于触发动画重置的 token（当日期或数据变化时更新）
@@ -102,15 +99,6 @@ export default function ExploreScreen() {
   // 从 Redux 获取营养数据
   const nutritionSummary = useAppSelector(selectNutritionSummaryByDate(currentSelectedDateString));
 
-  // 计算用户的营养目标
-  const nutritionGoals = useMemo(() => {
-    return calculateNutritionGoals({
-      weight: userProfile.weight,
-      height: userProfile.height,
-      birthDate: userProfile?.birthDate ? new Date(userProfile?.birthDate) : undefined,
-      gender: userProfile?.gender || undefined,
-    });
-  }, [userProfile]);
 
   // 心情相关状态
   const dispatch = useAppDispatch();
@@ -226,13 +214,6 @@ export default function ExploreScreen() {
       loadingRef.current.health = true;
       console.log('=== 开始HealthKit初始化流程 ===');
 
-      // const ok = await ensureHealthPermissions();
-      // if (!ok) {
-      //   const errorMsg = '无法获取健康权限，请确保在真实iOS设备上运行并授权应用访问健康数据';
-      //   console.warn(errorMsg);
-      //   return;
-      // }
-
       latestRequestKeyRef.current = requestKey;
 
       console.log('权限获取成功，开始获取健康数据...', derivedDate);
@@ -251,7 +232,6 @@ export default function ExploreScreen() {
             activeCalories: data.activeEnergyBurned,
             basalEnergyBurned: data.basalEnergyBurned,
             hrv: data.hrv,
-            oxygenSaturation: data.oxygenSaturation,
             heartRate: data.heartRate,
             activeEnergyBurned: data.activeEnergyBurned,
             activeCaloriesGoal: data.activeCaloriesGoal,
@@ -358,14 +338,6 @@ export default function ExploreScreen() {
     loadAllData(currentSelectedDate);
   }, [])
 
-  // 页面聚焦时的数据加载逻辑
-  // useFocusEffect(
-  //   React.useCallback(() => {
-  //     // 页面聚焦时加载数据，使用缓存机制避免频繁请求
-  //     console.log('页面聚焦，检查是否需要刷新数据...');
-  //     loadAllData(currentSelectedDate);
-  //   }, [loadAllData, currentSelectedDate])
-  // );
 
   // AppState 监听：应用从后台返回前台时的处理
   useEffect(() => {
@@ -487,16 +459,10 @@ export default function ExploreScreen() {
         {/* 营养摄入雷达图卡片 */}
         <NutritionRadarCard
           nutritionSummary={nutritionSummary}
-          nutritionGoals={nutritionGoals}
           burnedCalories={(basalMetabolism || 0) + (activeCalories || 0)}
           basalMetabolism={basalMetabolism || 0}
           activeCalories={activeCalories || 0}
           resetToken={animToken}
-          onMealPress={(mealType: 'breakfast' | 'lunch' | 'dinner' | 'snack') => {
-            console.log('选择餐次:', mealType);
-            // 这里可以导航到营养记录页面
-            pushIfAuthedElseLogin('/nutrition/records');
-          }}
         />
 
         <WeightHistoryCard />
@@ -575,9 +541,7 @@ export default function ExploreScreen() {
             {/* 血氧饱和度卡片 */}
             <FloatingCard style={styles.masonryCard} delay={1750}>
               <OxygenSaturationCard
-                resetToken={animToken}
                 style={styles.basalMetabolismCardOverride}
-                oxygenSaturation={oxygenSaturation}
               />
             </FloatingCard>