add tests and fix npm build, make frontend tests work @ mobile view

Reviewed-on: Ruderverein-Donau-Linz/rowt#224

frontend/playwright.config.ts

@@ -10,6 +10,7 @@ import { defineConfig, devices } from '@playwright/test';
  * See https://playwright.dev/docs/test-configuration.
  */
 export default defineConfig({
+  timeout: 180000,
   testDir: './tests',
   /* Run tests in files in parallel */
   fullyParallel: true,