feat: 新增饮食方案卡片及相关计算功能

- 在教练页面中新增饮食方案卡片，展示用户的饮食计划和相关数据
- 实现BMI计算、每日推荐摄入热量计算及营养素分配功能
- 优化体重历史记录卡片，增加动画效果提升用户体验
- 更新统计页面样式，增加体重卡片样式和按钮功能
- 修复获取HRV值的逻辑，确保数据准确性

app/(tabs)/coach.tsx

@@ -109,6 +109,7 @@ const CardType = {
   WEIGHT_INPUT: '__WEIGHT_INPUT_CARD__',
   DIET_INPUT: '__DIET_INPUT_CARD__',
   DIET_TEXT_INPUT: '__DIET_TEXT_INPUT__',
+  DIET_PLAN: '__DIET_PLAN_CARD__',
 } as const;
 
 type CardType = typeof CardType[keyof typeof CardType];
@@ -279,6 +280,7 @@ export default function CoachScreen() {
     // { key: 'analyze', label: '分析运动记录', action: () => handleAnalyzeRecords() },
     { key: 'weight', label: '#记体重', action: () => insertWeightInputCard() },
     { key: 'diet', label: '#记饮食', action: () => insertDietInputCard() },
+    { key: 'dietPlan', label: '#饮食方案', action: () => insertDietPlanCard() },
   ], [router, planDraft, checkin]);
 
   const scrollToEnd = useCallback(() => {
@@ -1281,6 +1283,167 @@ export default function CoachScreen() {
       );
     }
 
+    if (item.content?.startsWith(CardType.DIET_PLAN)) {
+      const cardId = item.content.split('\n')?.[1] || '';
+
+      // 获取用户数据
+      const weight = userProfile?.weight ? Number(userProfile.weight) : 58;
+      const height = userProfile?.height ? Number(userProfile.height) : 160;
+
+      // 计算年龄
+      const calculateAge = (birthday?: string): number => {
+        if (!birthday) return 25; // 默认年龄
+        try {
+          const birthDate = new Date(birthday);
+          const today = new Date();
+          let age = today.getFullYear() - birthDate.getFullYear();
+          const monthDiff = today.getMonth() - birthDate.getMonth();
+          if (monthDiff < 0 || (monthDiff === 0 && today.getDate() < birthDate.getDate())) {
+            age--;
+          }
+          return age > 0 ? age : 25;
+        } catch {
+          return 25;
+        }
+      };
+
+      const age = calculateAge(userProfile?.birthDate);
+      const gender = userProfile?.gender || 'female';
+      const name = userProfile?.name || '用户';
+
+      // 计算相关数据
+      const bmi = calculateBMI(weight, height);
+      const bmiStatus = getBMIStatus(bmi);
+      const dailyCalories = calculateDailyCalories(weight, height, age, gender);
+      const nutrition = calculateNutritionDistribution(dailyCalories);
+
+      return (
+        <View style={styles.dietPlanContainer}>
+          {/* 标题部分 */}
+          <View style={styles.dietPlanHeader}>
+            <View style={styles.dietPlanTitleContainer}>
+              <Ionicons name="restaurant-outline" size={20} color={Colors.light.accentGreenDark} />
+              <Text style={styles.dietPlanTitle}>我的饮食方案</Text>
+            </View>
+            <Text style={styles.dietPlanSubtitle}>MY DIET PLAN</Text>
+          </View>
+
+          {/* 我的档案数据 */}
+          <View style={styles.profileSection}>
+            <Text style={styles.sectionTitle}>我的档案数据</Text>
+            <View style={styles.profileDataRow}>
+              <View style={styles.avatarContainer}>
+                <View style={styles.avatar}>
+                  <Text style={styles.avatarText}>{name.charAt(0)}</Text>
+                </View>
+              </View>
+              <View style={styles.profileStats}>
+                <View style={styles.statItem}>
+                  <Text style={styles.statValue}>{age}</Text>
+                  <Text style={styles.statLabel}>年龄/岁</Text>
+                </View>
+                <View style={styles.statItem}>
+                  <Text style={styles.statValue}>{height.toFixed(1)}</Text>
+                  <Text style={styles.statLabel}>身高/CM</Text>
+                </View>
+                <View style={styles.statItem}>
+                  <Text style={styles.statValue}>{weight.toFixed(1)}</Text>
+                  <Text style={styles.statLabel}>体重/KG</Text>
+                </View>
+              </View>
+            </View>
+          </View>
+
+          {/* BMI部分 */}
+          <View style={styles.bmiSection}>
+            <View style={styles.bmiHeader}>
+              <Text style={styles.sectionTitle}>当前BMI</Text>
+              <View style={[styles.bmiStatusBadge, { backgroundColor: bmiStatus.color }]}>
+                <Text style={styles.bmiStatusText}>{bmiStatus.status}</Text>
+              </View>
+            </View>
+            <Text style={styles.bmiValue}>{bmi.toFixed(1)}</Text>
+            <View style={styles.bmiScale}>
+              <View style={[styles.bmiBar, { backgroundColor: '#87CEEB' }]} />
+              <View style={[styles.bmiBar, { backgroundColor: '#90EE90' }]} />
+              <View style={[styles.bmiBar, { backgroundColor: '#FFD700' }]} />
+              <View style={[styles.bmiBar, { backgroundColor: '#FFA07A' }]} />
+            </View>
+            <View style={styles.bmiLabels}>
+              <Text style={styles.bmiLabel}>偏瘦</Text>
+              <Text style={styles.bmiLabel}>正常</Text>
+              <Text style={styles.bmiLabel}>偏胖</Text>
+              <Text style={styles.bmiLabel}>肥胖</Text>
+            </View>
+          </View>
+
+          {/* 饮食目标 */}
+          <View style={styles.collapsibleSection}>
+            <View style={styles.collapsibleHeader}>
+              <Text style={styles.sectionTitle}>饮食目标</Text>
+              <Ionicons name="chevron-down" size={16} color="#687076" />
+            </View>
+          </View>
+
+          {/* 目标体重 */}
+          <View style={styles.collapsibleSection}>
+            <View style={styles.collapsibleHeader}>
+              <Text style={styles.sectionTitle}>目标体重</Text>
+              <Ionicons name="chevron-down" size={16} color="#687076" />
+            </View>
+          </View>
+
+          {/* 每日推荐摄入 */}
+          <View style={styles.caloriesSection}>
+            <View style={styles.caloriesHeader}>
+              <Text style={styles.sectionTitle}>每日推荐摄入</Text>
+              <Text style={styles.caloriesValue}>{dailyCalories}千卡</Text>
+            </View>
+
+            <View style={styles.nutritionGrid}>
+              <View style={styles.nutritionItem}>
+                <Text style={styles.nutritionValue}>{nutrition.carbs}g</Text>
+                <View style={styles.nutritionLabelRow}>
+                  <Ionicons name="nutrition-outline" size={16} color="#687076" />
+                  <Text style={styles.nutritionLabel}>碳水</Text>
+                </View>
+              </View>
+              <View style={styles.nutritionItem}>
+                <Text style={styles.nutritionValue}>{nutrition.protein}g</Text>
+                <View style={styles.nutritionLabelRow}>
+                  <Ionicons name="fitness-outline" size={16} color="#687076" />
+                  <Text style={styles.nutritionLabel}>蛋白质</Text>
+                </View>
+              </View>
+              <View style={styles.nutritionItem}>
+                <Text style={styles.nutritionValue}>{nutrition.fat}g</Text>
+                <View style={styles.nutritionLabelRow}>
+                  <Ionicons name="water-outline" size={16} color="#687076" />
+                  <Text style={styles.nutritionLabel}>脂肪</Text>
+                </View>
+              </View>
+            </View>
+
+            <Text style={styles.nutritionNote}>
+              根据您的基础代谢率，这到理想体重所需要的热量缺口计算得出每日的热量推荐值。
+            </Text>
+          </View>
+
+          {/* 底部按钮 */}
+          <TouchableOpacity
+            style={styles.dietPlanButton}
+            onPress={() => {
+              // 这里可以添加跳转到详细饮食方案页面的逻辑
+              console.log('跳转到饮食方案详情');
+            }}
+          >
+            <Ionicons name="restaurant" size={16} color="#FFFFFF" />
+            <Text style={styles.dietPlanButtonText}>饮食方案</Text>
+          </TouchableOpacity>
+        </View>
+      );
+    }
+
     // 在流式回复过程中显示取消按钮
     if (isStreaming && pendingAssistantIdRef.current === item.id && item.content?.trim()) {
       return (
@@ -1380,6 +1543,58 @@ export default function CoachScreen() {
     setTimeout(scrollToEnd, 100);
   }
 
+  function insertDietPlanCard() {
+    const id = `dpcard_${Date.now()}`;
+    const payload = `${CardType.DIET_PLAN}\n${id}`;
+    setMessages((prev) => [...prev, { id, role: 'assistant', content: payload }]);
+    setTimeout(scrollToEnd, 100);
+  }
+
+  // 计算BMI
+  function calculateBMI(weight: number, height: number): number {
+    if (!weight || !height || weight <= 0 || height <= 0) return 0;
+    const heightInMeters = height / 100;
+    return Number((weight / (heightInMeters * heightInMeters)).toFixed(1));
+  }
+
+  // 获取BMI状态
+  function getBMIStatus(bmi: number): { status: string; color: string } {
+    if (bmi < 18.5) return { status: '偏瘦', color: '#87CEEB' };
+    if (bmi < 24) return { status: '正常', color: '#90EE90' };
+    if (bmi < 28) return { status: '偏胖', color: '#FFD700' };
+    return { status: '肥胖', color: '#FFA07A' };
+  }
+
+  // 计算每日推荐摄入热量
+  function calculateDailyCalories(weight: number, height: number, age: number, gender: string = 'female'): number {
+    if (!weight || !height || !age) return 1376; // 默认值
+
+    // 使用Harris-Benedict公式计算基础代谢率
+    let bmr: number;
+    if (gender === 'male') {
+      bmr = 88.362 + (13.397 * weight) + (4.799 * height) - (5.677 * age);
+    } else {
+      bmr = 447.593 + (9.247 * weight) + (3.098 * height) - (4.330 * age);
+    }
+
+    // 考虑活动水平，这里使用轻度活动的系数1.375
+    return Math.round(bmr * 1.375);
+  }
+
+  // 计算营养素分配
+  function calculateNutritionDistribution(calories: number) {
+    // 碳水化合物 50%，蛋白质 15%，脂肪 35%
+    const carbCalories = calories * 0.5;
+    const proteinCalories = calories * 0.15;
+    const fatCalories = calories * 0.35;
+
+    return {
+      carbs: Math.round(carbCalories / 4), // 1g碳水 = 4卡路里
+      protein: Math.round(proteinCalories / 4), // 1g蛋白质 = 4卡路里
+      fat: Math.round(fatCalories / 9), // 1g脂肪 = 9卡路里
+    };
+  }
+
   async function handleSubmitWeight(text?: string, cardId?: string) {
     const val = parseFloat(String(text ?? '').trim());
     if (isNaN(val) || val <= 0 || val > 500) {
@@ -2419,6 +2634,181 @@ const styles = StyleSheet.create({
     top: 0,
     bottom: 0,
   },
+  // 饮食方案卡片样式
+  dietPlanContainer: {
+    backgroundColor: 'rgba(255,255,255,0.95)',
+    borderRadius: 16,
+    padding: 16,
+    gap: 16,
+    borderWidth: 1,
+    borderColor: `${Colors.light.accentGreen}33`, // 20% opacity
+  },
+  dietPlanHeader: {
+    gap: 4,
+  },
+  dietPlanTitleContainer: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: 8,
+  },
+  dietPlanTitle: {
+    fontSize: 18,
+    fontWeight: '800',
+    color: '#192126',
+  },
+  dietPlanSubtitle: {
+    fontSize: 12,
+    fontWeight: '600',
+    color: '#687076',
+    letterSpacing: 1,
+  },
+  profileSection: {
+    gap: 12,
+  },
+  sectionTitle: {
+    fontSize: 14,
+    fontWeight: '700',
+    color: '#192126',
+  },
+  profileDataRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: 16,
+  },
+  avatarContainer: {
+    alignItems: 'center',
+  },
+  profileStats: {
+    flexDirection: 'row',
+    flex: 1,
+    justifyContent: 'space-around',
+  },
+  statItem: {
+    alignItems: 'center',
+    gap: 4,
+  },
+  statValue: {
+    fontSize: 20,
+    fontWeight: '800',
+    color: '#192126',
+  },
+  statLabel: {
+    fontSize: 12,
+    color: '#687076',
+  },
+  bmiSection: {
+    gap: 12,
+  },
+  bmiHeader: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    justifyContent: 'space-between',
+  },
+  bmiStatusBadge: {
+    paddingHorizontal: 8,
+    paddingVertical: 4,
+    borderRadius: 12,
+  },
+  bmiStatusText: {
+    fontSize: 12,
+    fontWeight: '700',
+    color: '#FFFFFF',
+  },
+  bmiValue: {
+    fontSize: 32,
+    fontWeight: '800',
+    color: '#192126',
+    textAlign: 'center',
+  },
+  bmiScale: {
+    flexDirection: 'row',
+    height: 8,
+    borderRadius: 4,
+    overflow: 'hidden',
+    gap: 1,
+  },
+  bmiBar: {
+    flex: 1,
+    height: '100%',
+  },
+  bmiLabels: {
+    flexDirection: 'row',
+    justifyContent: 'space-between',
+    paddingHorizontal: 4,
+  },
+  bmiLabel: {
+    fontSize: 11,
+    color: '#687076',
+  },
+  collapsibleSection: {
+    paddingVertical: 8,
+    borderBottomWidth: 1,
+    borderBottomColor: 'rgba(0,0,0,0.06)',
+  },
+  collapsibleHeader: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    justifyContent: 'space-between',
+  },
+  caloriesSection: {
+    gap: 12,
+  },
+  caloriesHeader: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    justifyContent: 'space-between',
+  },
+  caloriesValue: {
+    fontSize: 18,
+    fontWeight: '800',
+    color: Colors.light.accentGreenDark,
+  },
+  nutritionGrid: {
+    flexDirection: 'row',
+    justifyContent: 'space-around',
+    gap: 16,
+  },
+  nutritionItem: {
+    alignItems: 'center',
+    gap: 8,
+  },
+  nutritionValue: {
+    fontSize: 24,
+    fontWeight: '800',
+    color: '#192126',
+  },
+  nutritionLabelRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: 4,
+  },
+  nutritionLabel: {
+    fontSize: 12,
+    color: '#687076',
+  },
+  nutritionNote: {
+    fontSize: 12,
+    color: '#687076',
+    lineHeight: 16,
+    textAlign: 'center',
+    marginTop: 8,
+  },
+  dietPlanButton: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    justifyContent: 'center',
+    gap: 8,
+    backgroundColor: Colors.light.accentGreenDark,
+    paddingVertical: 12,
+    paddingHorizontal: 16,
+    borderRadius: 12,
+    marginTop: 8,
+  },
+  dietPlanButtonText: {
+    fontSize: 14,
+    fontWeight: '700',
+    color: '#FFFFFF',
+  },
 });
 
 const markdownStyles = {