server : (webui) migrate project to ReactJS with typescript (#11688)

* init version

* fix auto scroll

* bring back copy btn

* bring back thought process

* add lint and format check on CI

* remove lang from html tag

* allow multiple generations at the same time

* lint and format combined

* fix unused var

* improve MarkdownDisplay

* fix more latex

* fix code block cannot be selected while generating

examples/server/webui/src/App.tsx

@@ -0,0 +1,36 @@
+import { HashRouter, Outlet, Route, Routes } from 'react-router';
+import Header from './components/Header';
+import Sidebar from './components/Sidebar';
+import { AppContextProvider } from './utils/app.context';
+import ChatScreen from './components/ChatScreen';
+
+function App() {
+  return (
+    <HashRouter>
+      <div className="flex flex-row drawer lg:drawer-open">
+        <AppContextProvider>
+          <Routes>
+            <Route element={<AppLayout />}>
+              <Route path="/chat/:convId" element={<ChatScreen />} />
+              <Route path="*" element={<ChatScreen />} />
+            </Route>
+          </Routes>
+        </AppContextProvider>
+      </div>
+    </HashRouter>
+  );
+}
+
+function AppLayout() {
+  return (
+    <>
+      <Sidebar />
+      <div className="chat-screen drawer-content grow flex flex-col h-screen w-screen mx-auto px-4">
+        <Header />
+        <Outlet />
+      </div>
+    </>
+  );
+}
+
+export default App;