Fix TypeScript errors

- Fix TS2353: Object literal may only specify known properties, and 'paymentMethod' does not exist in type 'Transaction'.
- Fix TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
- Fix TS2741: Property 'getPaymentMethodStats' is missing in type '{ transactions: Transaction[]; budgetData: BudgetData; categoryBudgets: Record<string, number>; selectedTab: BudgetPeriod; setSelectedTab: React.Dispatch<...>; ... 5 more ...; resetBudgetData: () => void; }' but required in type 'BudgetContextType'.

src/components/TransactionCard.tsx

@@ -1,22 +1,10 @@
-
 import React, { useState } from 'react';
 import { cn } from '@/lib/utils';
 import TransactionEditDialog from './TransactionEditDialog';
 import TransactionIcon from './transaction/TransactionIcon';
 import TransactionDetails from './transaction/TransactionDetails';
 import TransactionAmount from './transaction/TransactionAmount';
-
-export type Transaction = {
-  id: string;
-  title: string;
-  amount: number;
-  date: string;
-  category: string;
-  type: 'expense' | 'income';
-  notes?: string; // notes 필드를 옵셔널로 추가
-  localTimestamp?: string; // 로컬 수정 타임스탬프 추가
-  serverTimestamp?: string; // 서버 타임스탬프 추가
-};
+import { Transaction } from '@/contexts/budget/types';
 
 interface TransactionCardProps {
   transaction: Transaction;