Refactor useBudgetState into smaller files

Refactors the `useBudgetState.ts` file into smaller, more manageable files to improve code organization and maintainability. No functionality is changed.

src/contexts/budget/hooks/useCategoryBudgetState.ts

@@ -0,0 +1,37 @@
+
+import { useState, useEffect, useCallback } from 'react';
+import { 
+  loadCategoryBudgetsFromStorage, 
+  saveCategoryBudgetsToStorage, 
+  clearAllCategoryBudgets 
+} from '../storageUtils';
+
+// 카테고리 예산 상태 관리 훅
+export const useCategoryBudgetState = () => {
+  const [categoryBudgets, setCategoryBudgets] = useState<Record<string, number>>(
+    loadCategoryBudgetsFromStorage()
+  );
+
+  // 카테고리 예산 업데이트 함수
+  const updateCategoryBudgets = useCallback((newCategoryBudgets: Record<string, number>) => {
+    setCategoryBudgets(newCategoryBudgets);
+    saveCategoryBudgetsToStorage(newCategoryBudgets);
+    
+    // 로컬 이벤트 발생 (다른 컴포넌트에서 변경 감지하도록)
+    window.dispatchEvent(new Event('categoryBudgetsUpdated'));
+  }, []);
+
+  // 카테고리 예산 초기화 함수
+  const resetCategoryBudgets = useCallback(() => {
+    clearAllCategoryBudgets();
+    setCategoryBudgets(loadCategoryBudgetsFromStorage());
+    console.log('카테고리 예산이 초기화되었습니다.');
+  }, []);
+
+  return {
+    categoryBudgets,
+    setCategoryBudgets,
+    updateCategoryBudgets,
+    resetCategoryBudgets
+  };
+};