Fix TypeScript errors

Fixes TypeScript errors related to missing properties and incorrect exports.

src/contexts/budget/BudgetContext.tsx

@@ -2,7 +2,7 @@
 import React from 'react';
 import { useBudgetState } from './useBudgetState';
 import { BudgetContext, BudgetContextType } from './useBudget';
-import { BudgetPeriod } from './types';
+import { BudgetPeriod, Transaction } from './types';
 
 // 컨텍스트 프로바이더 컴포넌트
 export const BudgetProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
@@ -19,4 +19,5 @@ export const BudgetProvider: React.FC<{ children: React.ReactNode }> = ({ childr
 export { useBudget } from './useBudget';
 export type { BudgetContextType } from './useBudget';
 
-export type { BudgetPeriod } from './types';
+// types.ts에서 타입들을 export
+export { BudgetPeriod, Transaction } from './types';