feat: 更新应用名称和图标，优化用户界面

- 将应用名称修改为“Health Bot”，提升品牌识别度
- 更新应用图标为 logo.png，确保视觉一致性
- 删除不再使用的 ai-coach-chat 页面，简化代码结构
- 更新多个页面的导航和按钮文本，提升用户体验
- 添加体重历史记录功能，支持用户追踪健康数据
- 优化 Redux 状态管理，确保数据处理的准确性和稳定性

components/BMICard.tsx

@@ -8,16 +8,18 @@ import {
 import { Ionicons } from '@expo/vector-icons';
 import React, { useState } from 'react';
 import {
+  Dimensions,
   Modal,
   Pressable,
-  ScrollView,
   StyleSheet,
   Text,
   TouchableOpacity,
-  View,
+  View
 } from 'react-native';
 import Toast from 'react-native-toast-message';
 
+const { width: screenWidth, height: screenHeight } = Dimensions.get('window');
+
 interface BMICardProps {
   weight?: number;
   height?: number;
@@ -31,8 +33,6 @@ export function BMICard({ weight, height, style }: BMICardProps) {
   const canCalculate = canCalculateBMI(weight, height);
   let bmiResult: BMIResult | null = null;
 
-
-
   if (canCalculate && weight && height) {
     try {
       bmiResult = getBMIResult(weight, height);
@@ -156,56 +156,88 @@ export function BMICard({ weight, height, style }: BMICardProps) {
           style={styles.modalBackdrop}
           onPress={handleHideInfoModal}
         >
-          <Pressable style={styles.modalContainer} onPress={(e) => e.stopPropagation()}>
-            <View style={styles.modalContent}>
-              <View style={styles.modalHeader}>
+          <Pressable 
+            style={styles.modalContainer}
+            onPress={(e) => e.stopPropagation()}
+          >
+            {/* 弹窗头部 */}
+            <View style={styles.modalHeader}>
+              <View style={styles.modalTitleContainer}>
+                <View style={styles.modalIconContainer}>
+                  <Ionicons name="fitness" size={24} color="#3B82F6" />
+                </View>
                 <Text style={styles.modalTitle}>BMI 指数说明</Text>
-                <TouchableOpacity
-                  onPress={handleHideInfoModal}
-                  style={styles.closeButton}
-                  activeOpacity={0.7}
-                >
-                  <Ionicons name="close" size={20} color="#6B7280" />
-                </TouchableOpacity>
+              </View>
+              <TouchableOpacity
+                onPress={handleHideInfoModal}
+                style={styles.closeButton}
+                activeOpacity={0.7}
+              >
+                <Ionicons name="close" size={20} color="#6B7280" />
+              </TouchableOpacity>
+            </View>
+
+            {/* 内容区域 - 去除滚动，精简设计 */}
+            <View style={styles.modalContent}>
+              {/* 介绍部分 */}
+              <View style={styles.introSection}>
+                <Text style={styles.modalDescription}>
+                  BMI 是评估体重与身高关系的健康指标
+                </Text>
+                <View style={styles.formulaContainer}>
+                  <Text style={styles.formulaText}>
+                    计算公式：体重(kg) ÷ 身高²(m)
+                  </Text>
+                </View>
               </View>
 
-              <ScrollView
-                style={styles.modalBody}
-                showsVerticalScrollIndicator={false}
-                contentContainerStyle={{ paddingBottom: 20 }}
-              >
-                <Text style={styles.modalDescription}>
-                  BMI（身体质量指数）是评估体重与身高关系的常用指标，计算公式为：体重(kg) ÷ 身高²(m)
-                </Text>
+              {/* BMI 分类标准 - 紧凑设计 */}
+              <View style={styles.categoriesSection}>
+                <Text style={styles.sectionTitle}>分类标准</Text>
+                <View style={styles.categoriesGrid}>
+                  {BMI_CATEGORIES.map((category, index) => {
+                    const colors = index === 0 ? { bg: '#FEF3C7', text: '#B45309' } :
+                      index === 1 ? { bg: '#E8F5E8', text: '#2D5016' } :
+                        index === 2 ? { bg: '#FEF3C7', text: '#B45309' } :
+                          { bg: '#FEE2E2', text: '#B91C1C' };
 
-                <Text style={styles.sectionTitle}>BMI 分类标准</Text>
-                {BMI_CATEGORIES.map((category, index) => {
-                  const colors = index === 0 ? { bg: '#FFF4E6', text: '#8B7355' } :
-                    index === 1 ? { bg: '#E8F5E8', text: '#2D5016' } :
-                      index === 2 ? { bg: '#FEF3C7', text: '#B45309' } :
-                        { bg: '#FEE2E2', text: '#B91C1C' };
-
-                  return (
-                    <View key={index} style={[styles.categoryItem, { backgroundColor: colors.bg }]}>
-                      <View style={styles.categoryHeader}>
-                        <Text style={[styles.categoryName, { color: colors.text }]}>
-                          {category.name}
-                        </Text>
-                        <Text style={[styles.categoryRange, { color: colors.text }]}>
-                          {category.range}
+                    return (
+                      <View key={index} style={[styles.categoryCompact, { backgroundColor: colors.bg }]}>
+                        <View style={styles.categoryCompactHeader}>
+                          <Text style={[styles.categoryCompactName, { color: colors.text }]}>
+                            {category.name}
+                          </Text>
+                          <Text style={[styles.categoryCompactRange, { color: colors.text }]}>
+                            {category.range}
+                          </Text>
+                        </View>
+                        <Text style={[styles.categoryCompactAdvice, { color: colors.text }]} numberOfLines={2}>
+                          {category.advice}
                         </Text>
                       </View>
-                      <Text style={styles.categoryAdvice}>
-                        {category.advice}
-                      </Text>
-                    </View>
-                  );
-                })}
+                    );
+                  })}
+                </View>
+              </View>
 
-                <Text style={styles.disclaimer}>
-                  * BMI 仅供参考，不能完全反映身体健康状况。如有疑问，请咨询专业医生。
+              {/* 健康提示 - 简化版 */}
+              <View style={styles.healthTips}>
+                <View style={styles.tipsHeader}>
+                  <Ionicons name="heart" size={16} color="#EF4444" />
+                  <Text style={styles.tipsTitle}>健康建议</Text>
+                </View>
+                <Text style={styles.tipsContent}>
+                  保持均衡饮食、规律运动、充足睡眠，定期监测体重变化
                 </Text>
-              </ScrollView>
+              </View>
+
+              {/* 免责声明 - 精简版 */}
+              <View style={styles.disclaimerCompact}>
+                <Ionicons name="information-circle" size={14} color="#6B7280" />
+                <Text style={styles.disclaimerCompactText}>
+                  BMI 仅供参考，如有疑问请咨询专业医生
+                </Text>
+              </View>
             </View>
           </Pressable>
         </Pressable>
@@ -336,8 +368,7 @@ const styles = StyleSheet.create({
     padding: 20,
   },
   modalContainer: {
-    width: '90%',
-    maxHeight: '85%',
+    width: screenWidth * 0.92,
     backgroundColor: '#FFFFFF',
     borderRadius: 24,
     overflow: 'hidden',
@@ -347,98 +378,161 @@ const styles = StyleSheet.create({
     shadowOpacity: 0.3,
     shadowRadius: 20,
   },
-  modalContent: {
-    maxHeight: '100%',
-  },
   modalHeader: {
     flexDirection: 'row',
     alignItems: 'center',
     justifyContent: 'space-between',
-    padding: 24,
+    padding: 20,
     borderBottomWidth: 1,
     borderBottomColor: '#F3F4F6',
     backgroundColor: '#FAFAFA',
   },
+  modalTitleContainer: {
+    flexDirection: 'row',
+    alignItems: 'center',
+  },
+  modalIconContainer: {
+    width: 40,
+    height: 40,
+    borderRadius: 12,
+    backgroundColor: '#EFF6FF',
+    alignItems: 'center',
+    justifyContent: 'center',
+    marginRight: 12,
+  },
   modalTitle: {
-    fontSize: 22,
+    fontSize: 20,
     fontWeight: '800',
     color: '#111827',
     letterSpacing: -0.5,
   },
   closeButton: {
-    padding: 8,
-    borderRadius: 20,
+    width: 36,
+    height: 36,
+    borderRadius: 18,
     backgroundColor: '#F3F4F6',
+    alignItems: 'center',
+    justifyContent: 'center',
   },
-  modalBody: {
-    paddingHorizontal: 24,
-    paddingVertical: 20,
+  
+  // 内容区域样式
+  modalContent: {
+    paddingHorizontal: 20,
+    paddingBottom: 24,
+  },
+  
+  // 介绍部分
+  introSection: {
+    marginBottom: 20,
   },
   modalDescription: {
-    fontSize: 16,
-    color: '#4B5563',
-    lineHeight: 26,
-    marginBottom: 28,
-    textAlign: 'center',
-    backgroundColor: '#F8FAFC',
-    padding: 16,
-    borderRadius: 12,
-    borderLeftWidth: 4,
-    borderLeftColor: '#3B82F6',
-  },
-  sectionTitle: {
-    fontSize: 20,
-    fontWeight: '800',
-    color: '#111827',
-    marginBottom: 16,
-    letterSpacing: -0.3,
-  },
-  categoryItem: {
-    borderRadius: 16,
-    padding: 20,
-    marginBottom: 16,
-    borderWidth: 1,
-    borderColor: 'rgba(0,0,0,0.05)',
-    shadowColor: '#000',
-    shadowOffset: { width: 0, height: 2 },
-    shadowOpacity: 0.05,
-    shadowRadius: 4,
-    elevation: 2,
-  },
-  categoryHeader: {
-    flexDirection: 'row',
-    justifyContent: 'space-between',
-    alignItems: 'center',
-    marginBottom: 12,
-  },
-  categoryName: {
-    fontSize: 18,
-    fontWeight: '800',
-    letterSpacing: -0.2,
-  },
-  categoryRange: {
-    fontSize: 15,
-    fontWeight: '700',
-    backgroundColor: 'rgba(255,255,255,0.8)',
-    paddingHorizontal: 12,
-    paddingVertical: 4,
-    borderRadius: 20,
-  },
-  categoryAdvice: {
     fontSize: 15,
     color: '#374151',
     lineHeight: 22,
-    fontWeight: '500',
+    textAlign: 'center',
+    marginBottom: 12,
   },
-  disclaimer: {
+  formulaContainer: {
+    backgroundColor: '#F8FAFC',
+    borderRadius: 12,
+    padding: 16,
+    borderLeftWidth: 4,
+    borderLeftColor: '#3B82F6',
+  },
+  formulaText: {
+    fontSize: 15,
+    color: '#1F2937',
+    fontWeight: '600',
+    textAlign: 'center',
+  },
+  
+  // 分类部分
+  categoriesSection: {
+    marginBottom: 18,
+  },
+  sectionTitle: {
+    fontSize: 16,
+    fontWeight: '800',
+    color: '#111827',
+    marginBottom: 12,
+    textAlign: 'center',
+  },
+  categoriesGrid: {
+    flexDirection: 'row',
+    flexWrap: 'wrap',
+    gap: 8,
+  },
+  categoryCompact: {
+    flex: 1,
+    minWidth: '48%',
+    borderRadius: 12,
+    padding: 12,
+    marginBottom: 8,
+  },
+  categoryCompactHeader: {
+    flexDirection: 'row',
+    justifyContent: 'space-between',
+    alignItems: 'center',
+    marginBottom: 6,
+  },
+  categoryCompactName: {
+    fontSize: 14,
+    fontWeight: '700',
+  },
+  categoryCompactRange: {
+    fontSize: 12,
+    fontWeight: '600',
+    opacity: 0.8,
+  },
+  categoryCompactAdvice: {
+    fontSize: 11,
+    lineHeight: 16,
+    fontWeight: '500',
+    opacity: 0.9,
+  },
+  
+  // 健康提示
+  healthTips: {
+    backgroundColor: '#F9FAFB',
+    borderRadius: 12,
+    padding: 14,
+    marginBottom: 16,
+    borderLeftWidth: 3,
+    borderLeftColor: '#EF4444',
+  },
+  tipsHeader: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    marginBottom: 6,
+  },
+  tipsTitle: {
+    fontSize: 14,
+    fontWeight: '700',
+    color: '#111827',
+    marginLeft: 6,
+  },
+  tipsContent: {
     fontSize: 13,
+    color: '#374151',
+    lineHeight: 18,
+  },
+  
+  // 免责声明紧凑版
+  disclaimerCompact: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    backgroundColor: '#F9FAFB',
+    borderRadius: 8,
+    padding: 12,
+    marginTop: 4,
+  },
+  disclaimerCompactText: {
+    fontSize: 12,
     color: '#6B7280',
     fontStyle: 'italic',
-    marginTop: 24,
-    textAlign: 'center',
-    backgroundColor: '#F9FAFB',
-    padding: 16,
-    borderRadius: 12,
-    lineHeight: 20,
+    lineHeight: 16,
+    marginLeft: 6,
+    flex: 1,
   },
+
 });