feat(weather): add pressure drop outlook

[Orinks]

Summary

• Add a configurable pressure outlook range in Display settings for 1 hour through 7 days.
• Normalize pressure outlooks across NWS, Open-Meteo, Pirate Weather, and Visual Crossing hourly data.
• Populate NWS hourly pressure from the NWS gridpoint pressure layer and preserve pressure outlooks in auto mode source fusion.
• Surface pressure drop/rise prediction wording and clear unavailable states when pressure data is missing or too short for the requested window.

Verification

• uv run pytest -q -n 0 --tb=short tests/test_nws_high_low.py tests/test_weather_client_trends.py tests/test_current_conditions.py tests/test_weather_client_fusion.py tests/test_source_priority_pirateweather.py tests/test_auto_mode_api_budget.py
• uv run ruff check src tests
• uv run ruff format --check src tests
• uv run pyright

Note: a previous full-suite run reached about 82% before a Windows access violation in audio/notification/thread tests; rerunning the implicated notifier/thread tests separately passed.