Enhance space environment with new spaceship model and Earth visuals

Earth Visuals

• Added a distant Earth texture background and refined the day/night terminator for more realistic lighting.
• Implemented transparent rendering and adjusted texture anisotropy to improve surface detail and depth.
• Introduced new shader uniforms and UI controls to allow for real-time customization of Earth's appearance.
• Optimized rendering order to ensure Earth layers correctly above the starfield in the Galaxy component.

Spaceship & Camera

• Integrated a new CAD-authored spaceship model generated via a procedural GLTF export script.
• Updated camera offsets to better frame the new spaceship model during gameplay or inspection.

UI & Graphics

• Enhanced the pixel art post-processing effect within the Galaxy component for a more consistent aesthetic.
• Adjusted the global UI layout to improve usability and accommodate new visual controls.

v0 Session