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/features/edit-feature.spec.ts

@@ -16,6 +16,8 @@ import {
   fillAddFeatureDialog,
   confirmAddFeature,
   clickElement,
+  authenticateForTests,
+  handleLoginScreenIfPresent,
 } from '../utils';
 
 const TEST_TEMP_DIR = createTempDirPath('edit-feature-test');
@@ -63,7 +65,10 @@ test.describe('Edit Feature', () => {
 
     await setupRealProject(page, projectPath, projectName, { setAsCurrent: true });
 
+    await authenticateForTests(page);
     await page.goto('/board');
+    await page.waitForLoadState('load');
+    await handleLoginScreenIfPresent(page);
     await waitForNetworkIdle(page);
 
     await expect(page.locator('[data-testid="board-view"]')).toBeVisible({ timeout: 10000 });