Wire forecast wind direction into recorded TrackPoints

Uses marineConditions.windDirDeg (refreshed every 20 min / 10 nm) falling
back to forecast.windDirDeg (initial Open-Meteo fetch) to compute a
boat-relative true wind angle: twa = (windDirDeg - cogDeg + 360) % 360.

Stores windSpeedKnots, windAngleDeg, and isTrueWind=true on every GPS
fix that has forecast data, enabling proper Tack/Jibe classification in
buildLogEvents() instead of the "Maneuver" fallback.

https://claude.ai/code/session_01KXYBuAHZkvv63DeUG6XaZD

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