first commit

ui/app/main.tsx

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+import { RouterProvider, createRouter } from "@tanstack/react-router";
+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+
+// Tailwind + global styles (also declares @font-face for local Geist fonts).
+import "@/app/globals.css";
+
+import { routeTree } from "./routeTree.gen";
+import { ErrorComponent } from "./__error";
+import { NotFoundComponent } from "./__notFound";
+
+const router = createRouter({
+	routeTree,
+	defaultPreload: "intent",
+	scrollRestoration: true,
+	notFoundMode: "root",
+	defaultNotFoundComponent: NotFoundComponent,
+	defaultErrorComponent: ErrorComponent,
+});
+
+declare module "@tanstack/react-router" {
+	interface Register {
+		router: typeof router;
+	}
+}
+
+const rootEl = document.getElementById("root");
+if (!rootEl) throw new Error("Root element #root not found");
+
+createRoot(rootEl).render(
+	<StrictMode>
+		<RouterProvider router={router} />
+	</StrictMode>,
+);