* fix artifacts on mobile
* feat(skybox): Add moon and milky way rendering
This commit enhances the simulated skybox with the following features:
- **Moon Rendering:** A textured moon with normal mapping has been added. The moon's phase is calculated and rendered correctly. Earthshine is also simulated.
- **Milky Way Background:** An equirectangular milky way texture is now rendered in the background. The intensity and saturation of the milky way can be adjusted.
- **Asset Processing Scripts:** Python scripts have been added to download and process the moon and milky way textures. This includes generating a normal map from a displacement map for the moon.
- **GUI Controls:** The GUI has been updated to include controls for the moon (azimuth, height, intensity, radius) and the milky way (intensity, saturation, sidereal time, latitude).
- **Real-time Sync:** The application can now use the user's geolocation to automatically set the position of the sun and moon.
- **Sun/Moon Calculation:** The library has been added to calculate the position of the sun and moon.
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