Restores the IsDaylight + ScreenDisplayMode auto-switch logic that was
stripped during the initial gpsd port (since the display-modes feature
hadn't been touched yet).
NOAA solar-position calc against the current GPS fix:
- First calc immediately when system clock is valid + GPS has fix
- Every 30s thereafter
- Writes IsDaylight memory param on change (twice/day, gated)
- ScreenDisplayMode 0 + sunset → 1 (auto-nightrider)
- ScreenDisplayMode 1 + sunrise → 0 (auto-normal)
- Manual modes 2/3/4 are never touched
Print-to-stderr instead of cloudlog per CLAUDE.md.
brianhansonxyz
f687d712e7