BasePage provides navigation, error capture, and interactable discovery
with fnmatch-based expected_failure matching. SettingsPage extends it
with tab-aware discovery. All conftest imports are deferred to method
bodies so the module loads without a live browser fixture.
Add pytest-playwright and pytest-json-report to requirements.txt; create
tests/e2e/ skeleton (modes/, pages/, results/) with __init__.py files and
.gitkeep; add results subdirs to .gitignore.
