Implement first-time user experience

- Implement default state for new users.
- Add a simple tutorial popup for first-time users.

src/contexts/budget/storageUtils.ts

@@ -6,7 +6,12 @@ import { DEFAULT_CATEGORY_BUDGETS, getInitialBudgetData } from './budgetUtils';
 export const loadTransactionsFromStorage = (): Transaction[] => {
   const storedTransactions = localStorage.getItem('transactions');
   if (storedTransactions) {
-    return JSON.parse(storedTransactions);
+    try {
+      return JSON.parse(storedTransactions);
+    } catch (error) {
+      console.error('트랜잭션 데이터 파싱 오류:', error);
+      return [];
+    }
   }
   return [];
 };
@@ -20,8 +25,16 @@ export const saveTransactionsToStorage = (transactions: Transaction[]): void =>
 export const loadCategoryBudgetsFromStorage = (): Record<string, number> => {
   const storedCategoryBudgets = localStorage.getItem('categoryBudgets');
   if (storedCategoryBudgets) {
-    return JSON.parse(storedCategoryBudgets);
+    try {
+      return JSON.parse(storedCategoryBudgets);
+    } catch (error) {
+      console.error('카테고리 예산 데이터 파싱 오류:', error);
+      return DEFAULT_CATEGORY_BUDGETS;
+    }
   }
+  
+  // 새 사용자를 위한 기본 카테고리 예산 저장
+  saveCategoryBudgetsToStorage(DEFAULT_CATEGORY_BUDGETS);
   return DEFAULT_CATEGORY_BUDGETS;
 };
 
@@ -34,9 +47,20 @@ export const saveCategoryBudgetsToStorage = (categoryBudgets: Record<string, num
 export const loadBudgetDataFromStorage = (): BudgetData => {
   const storedBudgetData = localStorage.getItem('budgetData');
   if (storedBudgetData) {
-    return JSON.parse(storedBudgetData);
+    try {
+      return JSON.parse(storedBudgetData);
+    } catch (error) {
+      console.error('예산 데이터 파싱 오류:', error);
+      const initialData = getInitialBudgetData();
+      saveBudgetDataToStorage(initialData);
+      return initialData;
+    }
   }
-  return getInitialBudgetData();
+  
+  // 새 사용자를 위한 기본 예산 데이터 저장
+  const initialData = getInitialBudgetData();
+  saveBudgetDataToStorage(initialData);
+  return initialData;
 };
 
 // 예산 데이터 저장