fix(location): name international current locations

[Orinks]

Summary

• Adds an OpenStreetMap Nominatim reverse-geocoding fallback after NWS cannot name detected coordinates
• Builds editable saved-location labels for international detected locations and preserves country codes when available
• Keeps unavailable, timeout, and invalid-response cases graceful so manual entry remains available

Test Plan

• .venv\Scripts\python.exe -m pytest tests\test_location_manager_address_geocoding.py tests\test_current_location.py -q
• .venv\Scripts\python.exe -m ruff check src\accessiweather\location_manager.py tests\test_location_manager_address_geocoding.py
• .venv\Scripts\pyright.exe src\accessiweather\location_manager.py
• .venv\Scripts\python.exe -m pytest tests\test_location_manager_address_geocoding.py tests\test_current_location.py tests\test_config_manager.py::TestConfigManager::test_update_location_details_changes_coordinates_and_clears_zone_metadata tests\test_config_manager.py::TestConfigManager::test_update_location_details_keeps_zone_metadata_when_coordinates_match tests\test_config_manager.py::TestConfigManager::test_update_location_details_nonexistent_returns_false tests\test_config_manager.py::TestConfigManager::test_update_location_details_rejects_duplicate_display_name tests\test_all_locations_view.py::TestEditLocation --cov=accessiweather --cov-report=xml:reports\coverage-international-location.xml -q
• uvx diff-cover reports\coverage-international-location.xml --compare-branch=origin/dev --fail-under=80 --exclude "*/accessiweather/ui/*"