Refactor: Split Index page

Refactor Index.tsx into smaller, more manageable components.

src/components/RecentTransactionsSection.tsx

@@ -0,0 +1,26 @@
+
+import React from 'react';
+import TransactionCard, { Transaction } from '@/components/TransactionCard';
+
+interface RecentTransactionsSectionProps {
+  transactions: Transaction[];
+}
+
+const RecentTransactionsSection: React.FC<RecentTransactionsSectionProps> = ({ transactions }) => {
+  return (
+    <>
+      <h2 className="text-lg font-semibold mb-3 mt-8">최근 지출</h2>
+      <div className="grid gap-3 mb-6">
+        {transactions.map(transaction => (
+          <TransactionCard key={transaction.id} transaction={transaction} />
+        ))}
+      </div>
+      
+      <div className="flex justify-center mb-6">
+        <button className="text-neuro-income font-medium">모든 거래 보기</button>
+      </div>
+    </>
+  );
+};
+
+export default RecentTransactionsSection;