Remove transaction notification setting

Removes the transaction notification setting from the notification settings page.

src/pages/NotificationSettings.tsx

@@ -1,6 +1,5 @@
-
 import React, { useState } from 'react';
-import { ArrowLeft, Bell, BellOff, MessageCircle, Mail, Shield, Volume2 } from 'lucide-react';
+import { ArrowLeft, BellOff, MessageCircle, Mail, Shield, Volume2 } from 'lucide-react';
 import { useNavigate } from 'react-router-dom';
 import { Button } from '@/components/ui/button';
 import { Switch } from '@/components/ui/switch';
@@ -20,13 +19,6 @@ const NotificationSettings = () => {
   const { toast } = useToast();
   
   const [settings, setSettings] = useState<NotificationSetting[]>([
-    {
-      id: 'transactions',
-      title: '거래 알림',
-      description: '입금 및 출금 시 알림을 받습니다.',
-      icon: <Bell size={20} />,
-      enabled: true,
-    },
     {
       id: 'budget',
       title: '예산 알림',