feat: add E2E tests for device creation and account management

10 E2E tests using NiceGUI's User fixture:
- Device creation flow and name validation
- Password change (success, wrong current, mismatch, too short)
- API token creation, TOTP registration, invalid code rejection
- Account deletion with email confirmation

Tests live in tests/e2e/ with a separate conftest that loads the
NiceGUI testing plugin. CI runs unit and E2E tests as separate steps.

pyproject.toml

@@ -47,3 +47,4 @@ asyncio_mode = "auto"
 asyncio_default_fixture_loop_scope = "session"
 asyncio_default_test_loop_scope = "session"
 testpaths = ["tests"]
+main_file = "wiregui/main.py"