Update ThemeContext.tsx

frontend/src/context/ThemeContext.tsx

@@ -1,7 +1,4 @@
-"use client";
-
-import type React from "react";
-import { createContext, useState, useContext, useEffect } from "react";
+import React, { createContext, useState, useContext, useEffect } from "react";
 
 type Theme = "light" | "dark";