Add spacing below payment chart

Adds 80px margin below the payment method chart for better visual spacing.

src/pages/Analytics.tsx

@@ -1,3 +1,4 @@
+
 import React, { useState, useEffect } from 'react';
 import NavBar from '@/components/NavBar';
 import ExpenseChart from '@/components/ExpenseChart';
@@ -171,6 +172,9 @@ const Analytics = () => {
         {/* 결제 방법 차트 추가 */}
         <h2 className="text-lg font-semibold mb-3">결제 방법 비율</h2>
         <PaymentMethodChart data={paymentMethodData} isEmpty={!hasPaymentData} />
+        
+        {/* 결제 방법 차트 아래 80px 여유 공간 추가 */}
+        <div className="h-20"></div>
       </div>
 
       <AddTransactionButton />