Fix TS2614 and TS1205 errors

Corrected import/export of Transaction type and fixed isolatedModules error.

src/contexts/budget/BudgetContext.tsx

@@ -19,6 +19,5 @@ export const BudgetProvider: React.FC<{ children: React.ReactNode }> = ({ childr
 export { useBudget } from './useBudget';
 export type { BudgetContextType } from './useBudget';
 
-// types.ts에서 타입들을 export
-export { BudgetPeriod } from './types';
-export type { Transaction } from './types';
+// types.ts에서 타입들을 export type으로 내보냅니다
+export type { BudgetPeriod, Transaction } from './types';