Refactor TransactionEditDialog component

The TransactionEditDialog component was refactored into smaller, more manageable components to improve code organization and maintainability. The functionality remains the same.

src/components/transaction/categoryUtils.ts

@@ -0,0 +1,13 @@
+
+import { EXPENSE_CATEGORIES } from '@/constants/categoryIcons';
+
+/**
+ * 카테고리 매핑 함수 - 이전 카테고리명을 새 카테고리명으로 변환
+ */
+export const mapCategoryToNew = (oldCategory: string): "음식" | "쇼핑" | "교통비" => {
+  if (oldCategory === '식비') return '음식';
+  if (oldCategory === '생활비') return '쇼핑';
+  if (EXPENSE_CATEGORIES.includes(oldCategory as any)) return oldCategory as "음식" | "쇼핑" | "교통비";
+  // 기본값은 '쇼핑'으로 설정
+  return '쇼핑';
+};