feat: enhance TabLayout and HomeScreen with safe area insets and optimized refresh handling

app/(tabs)/_layout.tsx

@@ -3,11 +3,13 @@ import React from 'react'
 import { StyleSheet, View, Text } from 'react-native'
 import { LinearGradient } from 'expo-linear-gradient'
 import { useTranslation } from 'react-i18next'
+import { useSafeAreaInsets } from 'react-native-safe-area-context'
 
 import { HomeIcon, MessageIcon, MyIcon, VideoIcon } from '@/components/icon'
 
 export default function TabLayout() {
   const { t } = useTranslation()
+  const insets = useSafeAreaInsets()
 
   return (
     <Tabs
@@ -19,9 +21,9 @@ export default function TabLayout() {
         tabBarShowLabel: true,
         tabBarStyle: {
           backgroundColor: '#1C1E22CC',
-          height: 83,
+          height: 84 + insets.bottom,
           paddingTop: 4,
-          paddingBottom: 4,
+          paddingBottom: insets.bottom,
           paddingLeft: 4,
           paddingRight: 4,
           borderTopWidth: 0,

app/(tabs)/index.tsx

@@ -115,15 +115,13 @@ export default function HomeScreen() {
 
     const [refreshing, setRefreshing] = useState(false)
 
-    // 下拉刷新处理
+    // 下拉刷新处理 - 只刷新当前分类的模板
     const handleRefresh = useCallback(async () => {
+        if (!selectedCategoryId) return
         setRefreshing(true)
-        await Promise.all([
+        await loadTemplates({ categoryId: selectedCategoryId })
-            loadCategories(),
-            selectedCategoryId ? loadTemplates({ categoryId: selectedCategoryId }) : Promise.resolve(),
-        ])
         setRefreshing(false)
-    }, [selectedCategoryId, loadCategories, loadTemplates])
+    }, [selectedCategoryId, loadTemplates])
 
     // 加载更多处理
     const handleEndReached = useCallback(() => {
@@ -289,7 +287,7 @@ export default function HomeScreen() {
                 numColumns={NUM_COLUMNS}
                 columnWrapperStyle={styles.columnWrapper}
                 style={styles.scrollView}
-                contentContainerStyle={styles.scrollContent}
+                contentContainerStyle={[styles.scrollContent, { paddingBottom: 60 + insets.bottom + 20 }]}
                 showsVerticalScrollIndicator={false}
                 onScroll={(e) => handleScroll(e.nativeEvent.contentOffset.y)}
                 scrollEventThrottle={Platform.OS === 'ios' ? 16 : 50}

components/blocks/home/TabNavigation.tsx

@@ -1,4 +1,4 @@
-import React from 'react'
+import React, { useRef, useEffect, useCallback } from 'react'
 import {
   View,
   Text,
@@ -6,9 +6,15 @@ import {
   ScrollView,
   StyleSheet,
   ViewStyle,
+  Dimensions,
+  LayoutChangeEvent,
 } from 'react-native'
 import { DownArrowIcon } from '@/components/icon'
 
+const SCREEN_WIDTH = Dimensions.get('window').width
+const ARROW_WIDTH = 48 // 箭头按钮宽度 (padding 8 * 2 + icon ~24 + marginLeft 8)
+const HORIZONTAL_PADDING = 16
+
 interface TabNavigationProps {
   tabs: string[]
   activeIndex: number
@@ -30,6 +36,42 @@ export function TabNavigation({
   wrapperStyle,
   onLayout,
 }: TabNavigationProps): JSX.Element {
+  const scrollViewRef = useRef<ScrollView>(null)
+  const tabLayouts = useRef<{ x: number; width: number }[]>([])
+
+  // 计算可用的滚动区域宽度
+  const scrollAreaWidth = SCREEN_WIDTH - HORIZONTAL_PADDING * 2 - (showArrow ? ARROW_WIDTH : 0)
+
+  // 滚动到激活的 tab 使其居中
+  const scrollToActiveTab = useCallback((index: number) => {
+    const layout = tabLayouts.current[index]
+    if (!layout || !scrollViewRef.current) return
+
+    // 计算让 tab 居中需要的滚动位置
+    const tabCenter = layout.x + layout.width / 2
+    const scrollX = tabCenter - scrollAreaWidth / 2
+
+    scrollViewRef.current.scrollTo({
+      x: Math.max(0, scrollX),
+      animated: true,
+    })
+  }, [scrollAreaWidth])
+
+  // 当 activeIndex 变化时滚动
+  useEffect(() => {
+    // 延迟执行确保布局已完成
+    const timer = setTimeout(() => {
+      scrollToActiveTab(activeIndex)
+    }, 50)
+    return () => clearTimeout(timer)
+  }, [activeIndex, scrollToActiveTab])
+
+  // 记录每个 tab 的布局
+  const handleTabLayout = useCallback((index: number, event: LayoutChangeEvent) => {
+    const { x, width } = event.nativeEvent.layout
+    tabLayouts.current[index] = { x, width }
+  }, [])
+
   return (
     <View
       testID="tab-navigation"
@@ -45,6 +87,7 @@ export function TabNavigation({
     >
       <View style={styles.tabsContainer}>
         <ScrollView
+          ref={scrollViewRef}
           horizontal
           showsHorizontalScrollIndicator={false}
           contentContainerStyle={styles.tabsScrollContent}
@@ -55,6 +98,7 @@ export function TabNavigation({
               testID={`tab-${index}`}
               style={[styles.tab, activeIndex === index && styles.activeTab]}
               onPress={() => onTabPress(index)}
+              onLayout={(e) => handleTabLayout(index, e)}
             >
               <Text
                 style={[