feat(gateway): show action result toasts

app/gateway-frontend/src/App.vue

@@ -1,9 +1,11 @@
 <script setup lang="ts">
 import { RouterView } from 'vue-router';
+import ToastViewport from './components/ToastViewport.vue';
 </script>
 
 <template>
     <RouterView />
+    <ToastViewport />
 </template>
 
 <style>