Fix: Resolve TypeScript errors

The type `Transaction` was missing the `localTimestamp` property, causing TypeScript errors in `downloadTransaction.ts` and `uploadTransaction.ts`. This commit adds the `localTimestamp` property to the `Transaction` interface to resolve these errors.

src/components/TransactionCard.tsx

@@ -1,4 +1,3 @@
-
 import React, { useState } from 'react';
 import { cn } from '@/lib/utils';
 import TransactionEditDialog from './TransactionEditDialog';
@@ -14,6 +13,8 @@ export type Transaction = {
   category: string;
   type: 'expense' | 'income';
   notes?: string; // notes 필드를 옵셔널로 추가
+  localTimestamp?: string; // 로컬 수정 타임스탬프 추가
+  serverTimestamp?: string; // 서버 타임스탬프 추가
 };
 
 interface TransactionCardProps {

src/contexts/budget/types.ts

@@ -40,5 +40,7 @@ export interface Transaction {
   date: string;
   category: string;
   type: 'income' | 'expense';
-  notes?: string; // notes 필드를 옵셔널로 추가
+  notes?: string;
+  localTimestamp?: string; // 로컬 수정 타임스탬프 추가
+  serverTimestamp?: string; // 서버 타임스탬프 추가
 }