feat: 更新 AI 教练聊天界面和个人信息页面

- 在 AI 教练聊天界面中添加训练记录分析功能，允许用户基于近期训练记录获取分析建议
- 更新 Redux 状态管理，集成每日步数和卡路里目标
- 在个人信息页面中优化用户头像显示，支持从库中选择头像
- 修改首页布局，添加可拖动的教练徽章，提升用户交互体验
- 更新样式以适应新功能的展示和交互

app/(tabs)/index.tsx

@@ -9,7 +9,8 @@ import { useAuthGuard } from '@/hooks/useAuthGuard';
 import { getChineseGreeting } from '@/utils/date';
 import { useRouter } from 'expo-router';
 import React from 'react';
-import { Pressable, SafeAreaView, ScrollView, StyleSheet, View } from 'react-native';
+import { Animated, Image, PanResponder, Pressable, SafeAreaView, ScrollView, StyleSheet, useWindowDimensions, View } from 'react-native';
+import { useSafeAreaInsets } from 'react-native-safe-area-context';
 
 // 移除旧的“热门活动”滑动数据，改为固定的“热点功能”卡片
 
@@ -18,9 +19,108 @@ export default function HomeScreen() {
   const { pushIfAuthedElseLogin } = useAuthGuard();
   const theme = (useColorScheme() ?? 'light') as 'light' | 'dark';
   const colorTokens = Colors[theme];
+  const insets = useSafeAreaInsets();
+  const { width: windowWidth, height: windowHeight } = useWindowDimensions();
+
+  // Draggable coach badge state
+  const pan = React.useRef(new Animated.ValueXY()).current;
+  const [coachSize, setCoachSize] = React.useState({ width: 0, height: 0 });
+  const hasInitPos = React.useRef(false);
+  const startRef = React.useRef({ x: 0, y: 0 });
+  const dragState = React.useRef({ moved: false });
+
+  const clamp = (value: number, min: number, max: number) => Math.max(min, Math.min(max, value));
+
+  const panResponder = React.useMemo(() => PanResponder.create({
+    onStartShouldSetPanResponder: () => true,
+    onMoveShouldSetPanResponder: (_evt, gesture) => Math.abs(gesture.dx) + Math.abs(gesture.dy) > 2,
+    onPanResponderGrant: () => {
+      dragState.current.moved = false;
+      // @ts-ignore access current value
+      const currentX = (pan.x as any)._value ?? 0;
+      // @ts-ignore access current value
+      const currentY = (pan.y as any)._value ?? 0;
+      startRef.current = { x: currentX, y: currentY };
+    },
+    onPanResponderMove: (_evt, gesture) => {
+      if (!dragState.current.moved && (Math.abs(gesture.dx) + Math.abs(gesture.dy) > 4)) {
+        dragState.current.moved = true;
+      }
+      const nextX = startRef.current.x + gesture.dx;
+      const nextY = startRef.current.y + gesture.dy;
+      pan.setValue({ x: nextX, y: nextY });
+    },
+    onPanResponderRelease: (_evt, gesture) => {
+      const minX = 8;
+      const minY = insets.top + 2;
+      const maxX = Math.max(minX, windowWidth - coachSize.width - 8);
+      const maxY = Math.max(minY, windowHeight - coachSize.height - (insets.bottom + 8));
+      const rawX = startRef.current.x + gesture.dx;
+      const rawY = startRef.current.y + gesture.dy;
+      const clampedX = clamp(rawX, minX, maxX);
+      const clampedY = clamp(rawY, minY, maxY);
+      // Snap horizontally to nearest side (left/right only)
+      const distLeft = Math.abs(clampedX - minX);
+      const distRight = Math.abs(maxX - clampedX);
+      const snapX = distLeft <= distRight ? minX : maxX;
+      Animated.spring(pan, { toValue: { x: snapX, y: clampedY }, useNativeDriver: false, bounciness: 6 }).start(() => {
+        if (!dragState.current.moved) {
+          // Treat as tap
+          // @ts-ignore - expo-router string ok
+          router.push('/ai-coach-chat?name=Iris' as any);
+        }
+      });
+    },
+  }), [coachSize.height, coachSize.width, insets.bottom, insets.top, pan, windowHeight, windowWidth, router]);
   return (
     <SafeAreaView style={[styles.safeArea, { backgroundColor: theme === 'light' ? colorTokens.pageBackgroundEmphasis : colorTokens.background }]}>
       <ThemedView style={[styles.container, { backgroundColor: theme === 'light' ? colorTokens.pageBackgroundEmphasis : colorTokens.background }]}>
+        {/* Floating Coach Badge */}
+        <View pointerEvents="box-none" style={styles.coachOverlayWrap}>
+          <Animated.View
+            {...panResponder.panHandlers}
+            onLayout={(e) => {
+              const { width, height } = e.nativeEvent.layout;
+              if (width !== coachSize.width || height !== coachSize.height) {
+                setCoachSize({ width, height });
+              }
+              if (!hasInitPos.current && width > 0 && windowWidth > 0) {
+                const initX = windowWidth - width - 14;
+                const initY = insets.top + 2; // 默认更靠上，避免遮挡搜索框
+                pan.setValue({ x: initX, y: initY });
+                hasInitPos.current = true;
+              }
+            }}
+            style={[
+              styles.coachBadge,
+              {
+                transform: [{ translateX: pan.x }, { translateY: pan.y }],
+                backgroundColor: colorTokens.heroSurfaceTint,
+                borderColor: 'rgba(187,242,70,0.35)',
+                shadowColor: '#000',
+                shadowOpacity: 0.08,
+                shadowRadius: 10,
+                shadowOffset: { width: 0, height: 4 },
+                elevation: 3,
+                position: 'absolute',
+                left: 0,
+                top: 0,
+              },
+            ]}
+          >
+            <Image
+              source={{ uri: 'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/avatar/imageCoach01.jpeg' }}
+              style={styles.coachAvatar}
+            />
+            <View style={styles.coachMeta}>
+              <ThemedText style={styles.coachName}>Iris</ThemedText>
+              <View style={styles.coachStatusRow}>
+                <View style={styles.statusDot} />
+                <ThemedText style={styles.coachStatusText}>在线</ThemedText>
+              </View>
+            </View>
+          </Animated.View>
+        </View>
         <ScrollView showsVerticalScrollIndicator={false}>
           {/* Header Section */}
           <View style={styles.header}>
@@ -66,7 +166,7 @@ export default function HomeScreen() {
 
             <View style={styles.planList}>
               <PlanCard
-                image={'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/Imagettpg.png'}
+                image={'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/imagedemo.jpeg'}
                 title="体态评估"
                 subtitle="评估你的体态，制定训练计划"
                 level="初学者"
@@ -77,7 +177,6 @@ export default function HomeScreen() {
                   image={'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/Image30play@2x.png'}
                   title="每周打卡"
                   subtitle="养成训练习惯，练出好身材"
-                  level="初学者"
                   progress={0.75}
                 />
               </Pressable>
@@ -92,7 +191,7 @@ export default function HomeScreen() {
               </Pressable>
               <Pressable onPress={() => pushIfAuthedElseLogin('/checkin')}>
                 <PlanCard
-                  image={'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/Image30play@2x.png'}
+                  image={'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/ImageCheck.jpeg'}
                   title="每日打卡（自选动作）"
                   subtitle="选择动作，设置组数/次数，记录完成"
                   level="初学者"
@@ -126,6 +225,14 @@ const styles = StyleSheet.create({
     paddingTop: 16,
     paddingBottom: 8,
   },
+  coachOverlayWrap: {
+    position: 'absolute',
+    top: 0,
+    left: 0,
+    right: 0,
+    bottom: 0,
+    zIndex: 10,
+  },
   greeting: {
     fontSize: 16,
     color: '#8A8A8E',
@@ -138,6 +245,45 @@ const styles = StyleSheet.create({
     color: '#1A1A1A',
     lineHeight: 36,
   },
+  coachBadge: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    // RN 不完全支持 gap，这里用 margin 实现
+    paddingHorizontal: 10,
+    paddingVertical: 8,
+    borderRadius: 20,
+    borderWidth: 1,
+    backgroundColor: '#FFFFFF00',
+  },
+  coachAvatar: {
+    width: 26,
+    height: 26,
+    borderRadius: 13,
+  },
+  coachMeta: {
+    marginLeft: 8,
+  },
+  coachName: {
+    fontSize: 13,
+    fontWeight: '700',
+    color: '#192126',
+  },
+  coachStatusRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    marginTop: 2,
+  },
+  statusDot: {
+    width: 6,
+    height: 6,
+    borderRadius: 3,
+    backgroundColor: '#22C55E',
+    marginRight: 4,
+  },
+  coachStatusText: {
+    fontSize: 11,
+    color: '#6B7280',
+  },
   sectionContainer: {
     marginTop: 24,
   },