feat: integrate UI components into Home tab

Replace custom loading/error states with reusable components (RefreshControl, LoadingState, ErrorState). Add pull-to-refresh functionality and remove duplicate styles.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/(tabs)/index.tsx

@@ -19,7 +19,9 @@ import {
 import { SafeAreaView, useSafeAreaInsets } from 'react-native-safe-area-context';
 
 import { DownArrowIcon, PointsIcon, SearchIcon } from '@/components/icon';
-import { HomeSkeleton } from '@/components/skeleton/HomeSkeleton';
+import ErrorState from '@/components/ErrorState';
+import LoadingState from '@/components/LoadingState';
+import RefreshControl from '@/components/RefreshControl';
 import { useActivates } from '@/hooks/use-activates';
 import { useCategories } from '@/hooks/use-categories';
 import { CategoryTemplate } from '@repo/sdk';
@@ -82,6 +84,7 @@ export default function HomeScreen() {
     const params = useLocalSearchParams()
     const [activeTab, setActiveTab] = useState(0)
     const [selectedCategoryId, setSelectedCategoryId] = useState<string | null>(null)
+    const [refreshing, setRefreshing] = useState(false)
 
     const { load: loadCategories, data: categoriesData, loading: categoriesLoading, error: categoriesError } = useCategories()
     const { load, data: activatesData, error } = useActivates()
@@ -91,6 +94,12 @@ export default function HomeScreen() {
         loadCategories()
     }, [])
 
+    const handleRefresh = async () => {
+        setRefreshing(true)
+        await Promise.all([load(), loadCategories()])
+        setRefreshing(false)
+    }
+
     useEffect(() => {
         // 当分类数据加载完成后，默认选中第一个分类
         if (categoriesData?.categories && categoriesData.categories.length > 0 && !selectedCategoryId) {
@@ -280,6 +289,9 @@ export default function HomeScreen() {
                 style={styles.scrollView}
                 contentContainerStyle={styles.scrollContent}
                 showsVerticalScrollIndicator={false}
+                refreshControl={
+                    <RefreshControl refreshing={refreshing} onRefresh={handleRefresh} />
+                }
                 onScroll={(event) => {
                     const scrollY = event.nativeEvent.contentOffset.y
                     if (scrollY >= tabsPositionRef.current) {
@@ -330,26 +342,21 @@ export default function HomeScreen() {
                 )}
 
                 {/* 加载状态 */}
-                {showLoading && <HomeSkeleton />}
+                {showLoading && <LoadingState />}
+
+                {/* 错误状态 - 分类加载失败 */}
+                {categoriesError && (
+                    <ErrorState message="加载分类失败" onRetry={() => loadCategories()} />
+                )}
 
                 {/* 空状态 - 分类数据为空 */}
-                {showEmptyState && (
-                    <View style={styles.emptyState}>
-                        <Text style={styles.emptyStateText}>暂无分类数据</Text>
-                        <Pressable style={styles.retryButton} onPress={() => loadCategories()}>
-                            <Text style={styles.retryButtonText}>重新加载</Text>
-                        </Pressable>
-                    </View>
+                {showEmptyState && !categoriesError && (
+                    <ErrorState message="暂无分类数据" onRetry={() => loadCategories()} />
                 )}
 
                 {/* 空状态 - 当前分类下没有模板 */}
                 {showEmptyTemplates && (
-                    <View style={styles.emptyState}>
-                        <Text style={styles.emptyStateText}>该分类暂无模板</Text>
-                        <Pressable style={styles.retryButton} onPress={() => loadCategories()}>
-                            <Text style={styles.retryButtonText}>刷新</Text>
-                        </Pressable>
-                    </View>
+                    <ErrorState message="该分类暂无模板" onRetry={() => loadCategories()} />
                 )}
 
                 {/* 内容网格 - 使用 FlashList 优化性能 */}
@@ -659,26 +666,4 @@ const styles = StyleSheet.create({
         color: '#F5F5F5',
         lineHeight: 20,
     },
-    emptyState: {
-        flex: 1,
-        justifyContent: 'center',
-        alignItems: 'center',
-        paddingVertical: 60,
-        gap: 16,
-    },
-    emptyStateText: {
-        color: '#ABABAB',
-        fontSize: 14,
-    },
-    retryButton: {
-        backgroundColor: '#FF6699',
-        paddingHorizontal: 24,
-        paddingVertical: 12,
-        borderRadius: 8,
-    },
-    retryButtonText: {
-        color: '#FFFFFF',
-        fontSize: 14,
-        fontWeight: '600',
-    },
 })