Lumina Shader - Lite

Candidate for in-game testing before the stable v1.2.4 release.

Fixed:

Prevents NaN values during zero-luminance color normalization. Corrects Distant Horizons temporal reprojection to reduce LOD ghosting during camera movement. Optimized:

Reuses lightmap power calculations during shadow sampling. Please test dark scenes, camera movement near Distant Horizons LOD transitions, and shadows across the performance profiles.