fix: bug

app/exchange.tsx

@@ -5,7 +5,6 @@ import { useRouter } from 'expo-router';
 import React, { useCallback, useMemo, useState } from 'react';
 import {
   ActivityIndicator,
-  Alert,
   ScrollView,
   StyleSheet,
   Text,
@@ -14,6 +13,7 @@ import {
   View
 } from 'react-native';
 import { useSafeAreaInsets } from 'react-native-safe-area-context';
+import { Alert } from '@/utils/alert';
 
 type PurchaseTab = 'subscription' | 'pack';