1.6.4

1. Update design in Search
2. Update interaction (Settings/Interaction)

Core updates:

1. Update number formatting in HUD
2. Update star browser logic
3. Fix irregular galaxies' brightness

celestiamobile/Celestia@b7e659e
celestiamobile/CelestiaLocalization@e7ff7d0
CelestiaProject/CelestiaContent@06887c4