Add a way to display error dialogs

webapp/main.js

@@ -1,10 +1,14 @@
 import '../src/css/application.sass'
 
 import { createApp } from 'vue'
+import { createPinia } from 'pinia'
+
 import App from '../src/components/App.vue'
 import { loadCurrencies } from '../src/currency'
 
+const pinia = createPinia()
 const app = createApp(App)
+app.use(pinia)
 app.mount('#app')
 //console.log("test:", app.hej.test)