Add DisplayError to show user errors from the backend

frontend/src/main.ts

@@ -2,6 +2,7 @@ import { createApp } from "vue";
 import { fullscreenModeChanged } from "@/utilities/fullscreen";
 import { handleKeyUp, handleKeyDown, handleMouseDown } from "@/utilities/input";
 import App from "@/App.vue";
+import "@/utilities/errors";
 
 // Bind global browser events
 document.addEventListener("contextmenu", (e) => e.preventDefault());