Update Vite configuration to enable host access and fix proxy server URL to use the current hostname.

client/src/App.tsx

@@ -47,7 +47,7 @@ import ToolsTab from "./components/ToolsTab";
 
 const params = new URLSearchParams(window.location.search);
 const PROXY_PORT = params.get("proxyPort") ?? "3000";
-const PROXY_SERVER_URL = `http://localhost:${PROXY_PORT}`;
+const PROXY_SERVER_URL = `http://${window.location.hostname}:${PROXY_PORT}`;
 
 const App = () => {
   // Handle OAuth callback route

client/vite.config.ts

@@ -5,7 +5,9 @@ import { defineConfig } from "vite";
 // https://vitejs.dev/config/
 export default defineConfig({
   plugins: [react()],
-  server: {},
+  server: {
+    host: true,
+  },
   resolve: {
     alias: {
       "@": path.resolve(__dirname, "./src"),