feat: implement AppLayoutGuard for onboarding redirection

apps/web/src/router.tsx

@@ -1,5 +1,5 @@
 import { createRootRoute, createRoute, createRouter, Outlet } from '@tanstack/react-router'
-import { RootLayout } from './components/layout'
+import { AppLayoutGuard } from './components/layout/AppLayoutGuard'
 import { HomeView } from './routes/home'
 import { GroupsView } from './routes/groups'
 import { PaymentsView } from './routes/payments'
@@ -41,10 +41,11 @@ const onboardingRoute = createRoute({
 })
 
 // Capa con la navegación de la app autenticada (Sidebar + BottomNav).
+// El guard redirige a /onboarding a quien no completó el onboarding.
 const appLayoutRoute = createRoute({
   getParentRoute: () => rootRoute,
   id: 'app',
-  component: RootLayout,
+  component: AppLayoutGuard,
 })
 
 const indexRoute = createRoute({