refactor: useDebouncedCallback 타입 정의 개선 및 App.tsx에서 불필요한 import 제거

Author: realstone2

src/basic/App.tsx

@@ -1,11 +1,11 @@
 import { useCallback, useEffect, useState } from "react";
-import { CartItem, Coupon } from "../types";
+import { Coupon } from "../types";
 
 import useFilterSearchParams from "../hooks/useFilterSearchParams";
 import { AdminPage } from "./components/AdminPage";
 import { MainPage } from "./components/MainPage";
-import { useProducts } from "./hooks/useProducts";
 import { useCart } from "./hooks/useCart";
+import { useProducts } from "./hooks/useProducts";
 import {
   calculateCartTotal,
   calculateItemTotal,

src/basic/utils/hooks/useDebounce.ts

@@ -1,10 +1,10 @@
-import { useState, useEffect, useCallback, useRef } from "react";
+import { useCallback, useEffect, useRef } from "react";
 
 /**
  * 디바운스된 콜백 Hook
  * 함수 호출을 지정된 시간만큼 지연시킵니다
  */
-export function useDebouncedCallback<T extends (...args: any[]) => any>(
+export function useDebouncedCallback<T extends (...args: unknown[]) => unknown>(
   callback: T,
   delay: number
 ): T {