feat: drop assistant ui, use custom chat ui

src/main.tsx

@@ -1,13 +1,10 @@
 import { createRoot } from "react-dom/client";
 import "./index.css";
 import App from "./App.tsx";
-import { RuntimeProvider } from "./providers/Runtime.tsx";
 import { StreamProvider } from "./providers/Stream.tsx";
 
 createRoot(document.getElementById("root")!).render(
   <StreamProvider>
-    <RuntimeProvider>
-      <App />
-    </RuntimeProvider>
+    <App />
   </StreamProvider>,
 );