Add base web UI

remote_frontend/src/App.tsx

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+export function App(): React.ReactElement {}

remote_frontend/src/index.css

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+body {
+  margin: 0;
+  display: flex;
+  place-items: center;
+  min-width: 320px;
+  min-height: 100vh;
+}

remote_frontend/src/main.tsx

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+import React from "react";
+import ReactDOM from "react-dom/client";
+import "./index.css";
+import { App } from "./App";
+
+ReactDOM.createRoot(document.getElementById("root")!).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>
+);

remote_frontend/src/vite-env.d.ts

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+/// <reference types="vite/client" />