feat: implement force logout event and update navigation redirects

frontend/vue-app/src/layout/AuthLayout.vue

@@ -21,10 +21,8 @@ const router = useRouter()
 const route = useRoute()
 
 const handleBack = () => {
-  // route to the auth landing page instead of using browser history
-  router.push({ name: 'AuthLanding' }).catch(() => {
-    // fallback to a safe path if named route isn't available
-    window.location.href = '/auth'
+  router.push({ name: 'LandingPage' }).catch(() => {
+    window.location.href = '/'
   })
 }