try to fix ci

frontend/tests/helpers.ts

@@ -1,8 +1,26 @@
 import { exec } from 'child_process';
 import { promisify } from 'util';
+import { Page } from '@playwright/test';
 
 const execAsync = promisify(exec);
 
 export async function resetDatabase(): Promise<void> {
   await execAsync('cd .. && ./reset_test_data.sh');
 }
+
+export async function login(page: Page, username: string, password: string): Promise<void> {
+  // Clear cookies to ensure clean state
+  await page.context().clearCookies();
+
+  await page.goto("/auth");
+  await page.getByPlaceholder("Name").click();
+  await page.getByPlaceholder("Name").fill(username);
+  await page.getByPlaceholder("Passwort").click();
+  await page.getByPlaceholder("Passwort").fill(password);
+
+  // Wait for navigation after form submission
+  await Promise.all([
+    page.waitForURL(/\/(planned|log|$)/, { timeout: 10000 }),
+    page.getByPlaceholder("Passwort").press("Enter")
+  ]);
+}