Add handler for client and server errors

frontend/src/hooks.client.ts

@@ -0,0 +1,5 @@
+export async function handleError({ error, event, status, message }) {
+	return {
+		message
+	};
+}

frontend/src/hooks.server.ts

@@ -1,4 +1,10 @@
 export async function handle({ event, resolve }) {
 	const response = await resolve(event);
 	return response;
+}
+
+export async function handleError({ error, event, status, message }) {
+	return {
+		message
+	};
 }