feat: initial Honcho UI scaffold

React 19 + Vite 8 + TanStack Router SPA for browsing and chatting with
a self-hosted Honcho instance. Configurable base URL stored in localStorage
only. Dark/light theme, framer-motion animations, lucide-react icons.

src/main.tsx

@@ -0,0 +1,38 @@
+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+import { createRouter, RouterProvider } from "@tanstack/react-router";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { routeTree } from "./routeTree.gen";
+import "./index.css";
+
+const queryClient = new QueryClient({
+	defaultOptions: {
+		queries: {
+			staleTime: 30_000,
+			retry: 1,
+		},
+	},
+});
+
+const router = createRouter({
+	routeTree,
+	defaultPreload: "intent",
+	scrollRestoration: true,
+});
+
+declare module "@tanstack/react-router" {
+	interface Register {
+		router: typeof router;
+	}
+}
+
+const root = document.getElementById("root");
+if (!root) throw new Error("Missing #root element");
+
+createRoot(root).render(
+	<StrictMode>
+		<QueryClientProvider client={queryClient}>
+			<RouterProvider router={router} />
+		</QueryClientProvider>
+	</StrictMode>,
+);