test(nav): add E2E test for DocumentTopBar back navigation; fix auth.setup login label

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/e2e/auth.setup.ts

@@ -12,12 +12,12 @@ const authFile = path.join(__dirname, '.auth/user.json');
  *   E2E_PASSWORD  (default: admin123)
  */
 setup('authenticate', async ({ page }) => {
-	const username = process.env.E2E_USERNAME ?? 'admin';
+	const username = process.env.E2E_USERNAME ?? 'admin@familyarchive.local';
 	const password = process.env.E2E_PASSWORD ?? 'admin123';
 
 	await page.goto('/login');
-	await page.getByLabel('Benutzername').fill(username);
-	await page.getByLabel('Passwort').fill(password);
+	await page.getByLabel(/e-mail/i).fill(username);
+	await page.getByLabel(/passwort/i).fill(password);
 	await page.getByRole('button', { name: 'Anmelden' }).click();
 	await page.waitForURL('/');
 

frontend/e2e/document-topbar-back.spec.ts

@@ -0,0 +1,38 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('DocumentTopBar — back navigation', () => {
+	test('BackButton returns to /documents after navigating from the documents list', async ({
+		page
+	}) => {
+		// Navigate to home page first (mirrors the real user flow)
+		await page.goto('/');
+		await page.waitForSelector('[data-hydrated]');
+
+		// Click the Dokumente nav link (SPA navigation — pushes to history)
+		await page.click('a[href="/documents"]');
+		await page.waitForURL('/documents');
+		await page.waitForSelector('[data-hydrated]');
+
+		// Click first real document link (skip /documents/new and edit links)
+		const docLink = page.locator('a[href^="/documents/"]:not([href="/documents/new"])').first();
+		const count = await docLink.count();
+
+		if (count === 0) {
+			test.skip(true, 'No documents in test database');
+		}
+
+		const docHref = await docLink.getAttribute('href');
+		await docLink.click();
+		await page.waitForURL(new RegExp(docHref!.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')));
+		await page.waitForSelector('[data-hydrated]');
+
+		// Find and click the BackButton in the DocumentTopBar
+		const backBtn = page.locator('[data-topbar]').getByRole('button', { name: /zurück/i });
+		await expect(backBtn).toBeVisible();
+		await backBtn.click();
+
+		// Should be back at the documents list, not at /
+		await page.waitForURL(/\/documents($|\?)/);
+		expect(page.url()).toMatch(/\/documents($|\?)/);
+	});
+});