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/context/context-file-management.spec.ts

@@ -18,6 +18,7 @@ import {
   getByTestId,
   waitForNetworkIdle,
   getContextEditorContent,
+  authenticateForTests,
 } from '../utils';
 
 test.describe('Context File Management', () => {
@@ -31,6 +32,7 @@ test.describe('Context File Management', () => {
 
   test('should create a new markdown context file', async ({ page }) => {
     await setupProjectWithFixture(page, getFixturePath());
+    await authenticateForTests(page);
     await page.goto('/');
     await waitForNetworkIdle(page);