feat: Establish Playwright testing infrastructure with initial tests for authentication, admin, and instructor modules, and fix instructor video and quiz lesson management pages.

frontend_management/tests/fixtures/admin.setup.ts

@@ -0,0 +1,30 @@
+import { test as setup, expect } from '@playwright/test';
+import { TEST_ADMIN, TEST_URLS } from './test-data';
+import { fileURLToPath } from 'url';
+import path from 'path';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const ADMIN_AUTH_FILE = path.resolve(__dirname, '../.auth/admin.json');
+
+/**
+ * Admin authentication setup
+ * Logs in as admin and saves browser state (cookies) for reuse
+ */
+setup('authenticate as admin', async ({ page }) => {
+    await page.goto(TEST_URLS.login);
+    await page.waitForLoadState('networkidle');
+    await page.waitForTimeout(500);
+    // Fill login form
+    await page.locator('input[type="email"]').fill(TEST_ADMIN.email);
+    await page.locator('input[type="password"]').fill(TEST_ADMIN.password);
+
+    // Submit
+    await page.locator('button[type="submit"]').click();
+
+    // Wait for redirect to admin dashboard
+    await page.waitForURL('**/admin**', { timeout: 15_000 });
+    await expect(page).toHaveURL(/\/admin/);
+
+    // Save auth state
+    await page.context().storageState({ path: ADMIN_AUTH_FILE });
+});