Fix TypeScript errors

- Fix TS2353: Object literal may only specify known properties, and 'paymentMethod' does not exist in type 'Transaction'.
- Fix TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
- Fix TS2741: Property 'getPaymentMethodStats' is missing in type '{ transactions: Transaction[]; budgetData: BudgetData; categoryBudgets: Record<string, number>; selectedTab: BudgetPeriod; setSelectedTab: React.Dispatch<...>; ... 5 more ...; resetBudgetData: () => void; }' but required in type 'BudgetContextType'.

src/components/AddTransactionButton.tsx

@@ -1,4 +1,3 @@
-
 import React, { useState, useEffect } from 'react';
 import { PlusIcon } from 'lucide-react';
 import { Dialog, DialogContent, DialogHeader, DialogTitle } from './ui/dialog';
@@ -7,7 +6,7 @@ import { useBudget } from '@/contexts/BudgetContext';
 import { supabase } from '@/lib/supabase';
 import { isSyncEnabled, setLastSyncTime, trySyncAllData } from '@/utils/syncUtils';
 import ExpenseForm, { ExpenseFormValues } from './expenses/ExpenseForm';
-import { Transaction } from '@/components/TransactionCard';
+import { Transaction } from '@/contexts/budget/types';
 import { normalizeDate } from '@/utils/sync/transaction/dateUtils';
 import useNotifications from '@/hooks/useNotifications';
 
@@ -55,7 +54,7 @@ const AddTransactionButton = () => {
         date: formattedDate,
         category: data.category,
         type: 'expense',
-        paymentMethod: data.paymentMethod // 추가된 필드
+        paymentMethod: data.paymentMethod // 지출 방법 필드 추가
       };
       
       console.log('새 지출 추가:', newExpense);