feat: improve test setup and authentication handling

- Added `dev:test` script to package.json for streamlined testing without file watching.
- Introduced `kill-test-servers` script to ensure no existing servers are running on test ports before executing tests.
- Enhanced Playwright configuration to use mock agent for tests, ensuring consistent API responses and disabling rate limiting.
- Updated various test files to include authentication steps and handle login screens, improving reliability and reducing flakiness in tests.
- Added `global-setup` for e2e tests to ensure proper initialization before test execution.

apps/ui/tests/profiles/profiles-crud.spec.ts

@@ -14,12 +14,17 @@ import {
   saveProfile,
   waitForSuccessToast,
   countCustomProfiles,
+  authenticateForTests,
+  handleLoginScreenIfPresent,
 } from '../utils';
 
 test.describe('AI Profiles', () => {
   test('should create a new profile', async ({ page }) => {
     await setupMockProjectWithProfiles(page, { customProfilesCount: 0 });
+    await authenticateForTests(page);
     await page.goto('/');
+    await page.waitForLoadState('load');
+    await handleLoginScreenIfPresent(page);
     await waitForNetworkIdle(page);
     await navigateToProfiles(page);