person: add validation on relationship between person

src/Bundle/ChillPersonBundle/Resources/public/vuejs/VisGraph/index.js

@@ -3,8 +3,10 @@ import { store } from "./store.js"
 import { _createI18n } from 'ChillMainAssets/vuejs/_js/i18n'
 import { visMessages } from './i18n'
 import App from './App.vue'
+import VueToast from 'vue-toast-notification';
+import 'vue-toast-notification/dist/theme-sugar.css';
 
-import './vis-network'
+import './vis-network';
 
 const i18n = _createI18n(visMessages)
 const container = document.getElementById('relationship-graph')
@@ -25,5 +27,11 @@ const app = createApp({
 })
 .use(store)
 .use(i18n)
+.use(VueToast, {
+    position: "bottom-right",
+    type: "error",
+    duration: 5000,
+    dismissible: true
+ })
 .component('app', App)
 .mount('#relationship-graph')