feat(frontend): wire Vite app to FastAPI parser with NDJSON streaming + Upload page

src/components/Layout.tsx

@@ -0,0 +1,15 @@
+import { Outlet } from "react-router-dom";
+import { Sidebar } from "./Sidebar";
+
+export function Layout() {
+  return (
+    <div className="relative min-h-screen z-10">
+      <Sidebar />
+      <main className="md:pl-60">
+        <div className="mx-auto max-w-[1400px] px-8 py-10">
+          <Outlet />
+        </div>
+      </main>
+    </div>
+  );
+}