fix(notifications): restore Windows Action Center cold-start toast activation

[Orinks]

Summary

• preserve Windows toast activation arguments on cold start relaunches
• route the packaged desktop entrypoint through the shared activation-aware parser
• add regression coverage for Windows activation entrypoints

Testing

• ruff check src/accessiweather/main.py src/accessiweather/main.py tests/test_windows_activation_entrypoints.py
• pytest -q tests/test_windows_activation_entrypoints.py tests/test_notification_activation.py tests/test_wizard_cli_flag.py tests/test_app_notification_activation.py