Fix transaction delete type mismatch

The TransactionsContent component's onTransactionDelete prop was expecting a function that returns a boolean or a Promise<boolean>, but was receiving a function that returns void. This commit updates the type definition to match the expected return type.

src/pages/Transactions.tsx

@@ -35,7 +35,7 @@ const Transactions = () => {
   }, [budgetData, isLoading]);
 
   // 트랜잭션 삭제 핸들러 - 간소화 및 안정성 개선
-  const handleTransactionDelete = async (id: string) => {
+  const handleTransactionDelete = async (id: string): Promise<boolean> => {
     // 이미 처리 중인 경우 작업 무시
     if (isProcessing || deletingId === id) {
       console.log('이미 삭제 작업이 진행 중입니다:', deletingId);