refactor: clean up imports and remove unused socket context in Header component for improved readability

src/App.js

@@ -1,4 +1,4 @@
-import React, { useState, useEffect, useRef, useContext, lazy, Suspense } from "react";
+import React, { useState, useEffect, lazy, Suspense } from "react";
 import {
   Routes,
   Route,