feat: 更新营养雷达图组件，优化营养分析卡片

- 在营养分析卡片中引入更新日期和图标，提升信息展示
- 修改营养维度标签，简化文本内容
- 更新雷达图组件，支持自定义尺寸和标签显示
- 增加尺寸配置，优化图表显示效果
- 更新饮食记录服务，添加更新时间字段以支持新功能

components/NutritionRadarCard.tsx

@@ -1,4 +1,6 @@
 import { NutritionSummary } from '@/services/dietRecords';
+import Feather from '@expo/vector-icons/Feather';
+import dayjs from 'dayjs';
 import React, { useMemo } from 'react';
 import { StyleSheet, Text, View } from 'react-native';
 import { RadarCategory, RadarChart } from './RadarChart';
@@ -14,8 +16,8 @@ const NUTRITION_DIMENSIONS: RadarCategory[] = [
   { key: 'protein', label: '蛋白质' },
   { key: 'carbohydrate', label: '碳水' },
   { key: 'fat', label: '脂肪' },
-  { key: 'fiber', label: '膳食纤维' },
-  { key: 'sodium', label: '钠含量' },
+  { key: 'fiber', label: '纤维' },
+  { key: 'sodium', label: '钠' },
 ];
 
 export function NutritionRadarCard({ nutritionSummary, isLoading = false }: NutritionRadarCardProps) {
@@ -48,14 +50,21 @@ export function NutritionRadarCard({ nutritionSummary, isLoading = false }: Nutr
       { label: '蛋白质', value: nutritionSummary ? `${nutritionSummary.totalProtein.toFixed(1)} g` : '0.0 g', color: '#4ECDC4' },
       { label: '碳水', value: nutritionSummary ? `${nutritionSummary.totalCarbohydrate.toFixed(1)} g` : '0.0 g', color: '#45B7D1' },
       { label: '脂肪', value: nutritionSummary ? `${nutritionSummary.totalFat.toFixed(1)} g` : '0.0 g', color: '#FFA07A' },
-      { label: '膳食纤维', value: nutritionSummary ? `${nutritionSummary.totalFiber.toFixed(1)} g` : '0.0 g', color: '#98D8C8' },
+      { label: '纤维', value: nutritionSummary ? `${nutritionSummary.totalFiber.toFixed(1)} g` : '0.0 g', color: '#98D8C8' },
       { label: '钠', value: nutritionSummary ? `${Math.round(nutritionSummary.totalSodium)} mg` : '0 mg', color: '#F7DC6F' },
     ];
   }, [nutritionSummary]);
 
   return (
     <View style={styles.card}>
-      <Text style={styles.cardTitle}>营养摄入分析</Text>
+      <View style={styles.cardHeader}>
+        <Text style={styles.cardTitle}>营养摄入分析</Text>
+        <View style={styles.cardRightContainer}>
+          <Text style={styles.cardSubtitle}>更新: {dayjs(nutritionSummary?.updatedAt).format('YYYY-MM-DD HH:mm')}</Text>
+          <Feather name="more-vertical" size={16} color="#9AA3AE" />
+        </View>
+      </View>
+
 
       {isLoading ? (
         <View style={styles.loadingContainer}>
@@ -67,7 +76,7 @@ export function NutritionRadarCard({ nutritionSummary, isLoading = false }: Nutr
             <RadarChart
               categories={NUTRITION_DIMENSIONS}
               values={radarValues}
-              size={100}
+              size="small"
               maxValue={5}
             />
           </View>
@@ -102,11 +111,26 @@ const styles = StyleSheet.create({
     shadowRadius: 3.84,
     elevation: 5,
   },
+  cardHeader: {
+    flexDirection: 'row',
+    justifyContent: 'space-between',
+    alignItems: 'center',
+    marginBottom: 16,
+  },
   cardTitle: {
     fontSize: 18,
     fontWeight: '800',
     color: '#192126',
-    marginBottom: 16,
+  },
+  cardRightContainer: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: 4,
+  },
+  cardSubtitle: {
+    fontSize: 12,
+    color: '#9AA3AE',
+    fontWeight: '600',
   },
   contentContainer: {
     flexDirection: 'row',
@@ -114,19 +138,20 @@ const styles = StyleSheet.create({
   },
   radarContainer: {
     alignItems: 'center',
-    marginRight: 20,
+    marginRight: 6,
   },
   statsContainer: {
     flex: 1,
     flexDirection: 'row',
     flexWrap: 'wrap',
     justifyContent: 'space-between',
+    marginLeft: 4
   },
   statItem: {
     flexDirection: 'row',
     alignItems: 'center',
     width: '48%',
-    marginBottom: 8,
+    marginBottom: 16,
   },
   statDot: {
     width: 8,