Implement integration tests with Playwright

tests/admin.spec.ts

@@ -0,0 +1,26 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('Admin Dashboard', () => {
+    // Use a beforeEach hook to log in before each test
+    test.beforeEach(async ({ page }) => {
+        await page.goto('/en/admin');
+
+        // Check if login is needed
+        const passwordInput = page.getByPlaceholder('Password');
+        if (await passwordInput.isVisible()) {
+            await passwordInput.fill('admin123'); // Default dev password
+            await page.getByRole('button', { name: 'Login' }).click({ force: true });
+        }
+    });
+
+    test('Can access Admin Dashboard', async ({ page }) => {
+        // Song Library was moved, check for Dashboard title and other sections
+        await expect(page.getByRole('heading', { name: 'Hördle Admin Dashboard' })).toBeVisible();
+        await expect(page.getByText('Manage Specials')).toBeVisible();
+    });
+
+    test('Shows Daily Puzzles section', async ({ page }) => {
+        // "Today's Daily Puzzles" is the text in en.json
+        await expect(page.getByText("Today's Daily Puzzles")).toBeVisible();
+    });
+});