Remove unused imports from App.tsx

- Remove useState, Navbar, Header, Footer, Aside, Text, MediaQuery, and Burger imports.

src/views/App.tsx

@@ -1,14 +1,6 @@
 import * as React from 'react';
-import { useState } from 'react';
 import {
     AppShell,
-    Navbar,
-    Header,
-    Footer,
-    Aside,
-    Text,
-    MediaQuery,
-    Burger,
     useMantineTheme,
 } from '@mantine/core';
 import ChatPanel from './ChatPanel';