- 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.
Update waitForContextFile, selectContextFile, and waitForFileContentToLoad
helpers to use Playwright's expect().toPass() with retry intervals, handling
race conditions between API calls completing and UI re-rendering. Also add
waitForNetworkIdle after dialog closes in context-file-management test.
