Change search input placeholder

Change the placeholder text of the search input in Transactions.tsx from "거래 검색..." to "지출 검색...".

src/pages/Transactions.tsx

@@ -1,4 +1,3 @@
-
 import React, { useState } from 'react';
 import NavBar from '@/components/NavBar';
 import TransactionCard, { Transaction } from '@/components/TransactionCard';
@@ -74,7 +73,7 @@ const Transactions = () => {
           {/* Search */}
           <div className="neuro-pressed mb-5 flex items-center px-4 py-3 rounded-xl">
             <Search size={18} className="text-gray-500 mr-2" />
-            <input type="text" placeholder="거래 검색..." className="bg-transparent flex-1 outline-none text-sm" />
+            <input type="text" placeholder="지출 검색..." className="bg-transparent flex-1 outline-none text-sm" />
           </div>
           
           {/* Month Selector */}