Redirect app root to login when visiting /generadorexamenesllm without a session.

This fixes the blank page on the base URL by normalizing the no-trailing-slash path in nginx and redirecting unauthenticated users to /login before React mounts.

frontend/nginx.conf

@@ -50,6 +50,11 @@ server {
         try_files $uri =404;
     }
 
+    # Raíz sin barra final → login (evita pantalla en blanco por basename)
+    location = /generadorexamenesllm {
+        return 301 /generadorexamenesllm/login;
+    }
+
     location / {
         try_files $uri $uri/ /index.html;
     }

frontend/src/App.jsx

@@ -1,9 +1,9 @@
 import { Navigate, Route, Routes } from "react-router-dom";
 import Layout from "./components/layout/Layout";
 import ProtectedRoute from "./components/layout/ProtectedRoute";
+import RootRoute from "./components/layout/RootRoute";
 import LoginPage from "./pages/LoginPage";
 import RegisterPage from "./pages/RegisterPage";
-import DashboardPage from "./pages/DashboardPage";
 import CreateTemplatePage from "./pages/CreateTemplatePage";
 import TemplateDetailPage from "./pages/TemplateDetailPage";
 import NotFoundPage from "./pages/NotFoundPage";
@@ -21,7 +21,7 @@ export default function App() {
           </ProtectedRoute>
         }
       >
-        <Route path="/" element={<DashboardPage />} />
+        <Route path="/" element={<RootRoute />} />
         <Route path="/plantillas/nueva" element={<CreateTemplatePage />} />
         <Route path="/plantillas/:templateId" element={<TemplateDetailPage />} />
       </Route>

frontend/src/components/layout/RootRoute.jsx

@@ -0,0 +1,17 @@
+import { Navigate } from "react-router-dom";
+import { useAuth } from "../../context/AuthContext";
+import { SpinnerCenter } from "../ui/Spinner";
+import DashboardPage from "../../pages/DashboardPage";
+
+/** Raíz de la app: login si no hay sesión, dashboard si la hay. */
+export default function RootRoute() {
+  const { isAuthenticated, loading } = useAuth();
+
+  if (loading) return <SpinnerCenter label="Cargando tu sesión…" />;
+
+  if (!isAuthenticated) {
+    return <Navigate to="/login" replace />;
+  }
+
+  return <DashboardPage />;
+}

frontend/src/main.jsx

@@ -4,8 +4,11 @@ import { BrowserRouter } from "react-router-dom";
 import App from "./App";
 import { AuthProvider } from "./context/AuthContext";
 import { ToastProvider } from "./context/ToastContext";
+import { redirectRootToLoginIfNeeded } from "./utils/redirectRoot";
 import "./index.css";
 
+redirectRootToLoginIfNeeded();
+
 ReactDOM.createRoot(document.getElementById("root")).render(
   <React.StrictMode>
     <BrowserRouter basename={import.meta.env.BASE_URL}>

frontend/src/utils/redirectRoot.js

@@ -0,0 +1,25 @@
+const TOKEN_KEY = "genex_token";
+
+/**
+ * Si el usuario entra en la raíz de la app sin sesión, redirige a /login
+ * antes de montar React (evita pantalla en blanco por basename sin barra final).
+ */
+export function redirectRootToLoginIfNeeded() {
+  const base = import.meta.env.BASE_URL || "/";
+  const baseNoSlash = base.replace(/\/$/, "");
+  const { pathname, search, hash } = window.location;
+  const normalizedPath = pathname.replace(/\/$/, "") || "/";
+
+  const isAppRoot =
+    normalizedPath === baseNoSlash ||
+    normalizedPath === "/" ||
+    pathname === base;
+
+  if (!isAppRoot) return;
+  if (localStorage.getItem(TOKEN_KEY)) return;
+
+  const loginUrl = `${baseNoSlash}/login${search}${hash}`;
+  if (pathname + search + hash !== `${baseNoSlash}/login${search}${hash}`) {
+    window.location.replace(loginUrl);
+  }
+}