feat: 支持饮水记录卡片

app/(tabs)/coach.tsx

@@ -889,7 +889,7 @@ export default function CoachScreen() {
     };
 
     try {
-      const controller = postTextStream('/api/ai-coach/chat', body, { onChunk, onEnd, onError }, { timeoutMs: 120000 });
+      const controller = await postTextStream('/api/ai-coach/chat', body, { onChunk, onEnd, onError }, { timeoutMs: 120000 });
       streamAbortRef.current = controller;
     } catch (e) {
       onError(e);

app/(tabs)/statistics.tsx

@@ -7,6 +7,7 @@ import HeartRateCard from '@/components/statistic/HeartRateCard';
 import OxygenSaturationCard from '@/components/statistic/OxygenSaturationCard';
 import StepsCard from '@/components/StepsCard';
 import { StressMeter } from '@/components/StressMeter';
+import WaterIntakeCard from '@/components/WaterIntakeCard';
 import { WeightHistoryCard } from '@/components/weight/WeightHistoryCard';
 import { Colors } from '@/constants/Colors';
 import { getTabBarBottomPadding } from '@/constants/TabBar';
@@ -18,7 +19,7 @@ import { selectHealthDataByDate, setHealthData } from '@/store/healthSlice';
 import { fetchDailyMoodCheckins, selectLatestMoodRecordByDate } from '@/store/moodSlice';
 import { fetchDailyNutritionData, selectNutritionSummaryByDate } from '@/store/nutritionSlice';
 import { getMonthDaysZh, getTodayIndexInMonth } from '@/utils/date';
-import { ensureHealthPermissions, fetchHealthDataForDate, fetchTodayHRV, fetchRecentHRV } from '@/utils/health';
+import { ensureHealthPermissions, fetchHealthDataForDate, fetchRecentHRV } from '@/utils/health';
 import { getTestHealthData } from '@/utils/mockHealthData';
 import { calculateNutritionGoals } from '@/utils/nutrition';
 import AsyncStorage from '@react-native-async-storage/async-storage';
@@ -454,6 +455,15 @@ export default function ExploreScreen() {
                   style={styles.stepsCardOverride}
                 />
               </FloatingCard>
+
+              {/* 饮水记录卡片 */}
+              <FloatingCard style={styles.masonryCard} delay={500}>
+                <WaterIntakeCard
+                  selectedDate={currentSelectedDateString}
+                  style={styles.waterCardOverride}
+                />
+              </FloatingCard>
+
               <FloatingCard style={styles.masonryCard} delay={0}>
                 <StressMeter
                   value={hrvValue}
@@ -810,6 +820,11 @@ const styles = StyleSheet.create({
     borderRadius: 16,
     height: '100%', // 填充整个masonryCard
   },
+  waterCardOverride: {
+    margin: -16, // 抵消 masonryCard 的 padding
+    borderRadius: 16,
+    height: '100%', // 填充整个masonryCard
+  },
   compactStepsCard: {
     minHeight: 100,
   },