emil28092005 98a429710a feat: directional lighting with per-face normals ...

- Add Normal to Vertex struct and vertex input pipeline.
- Update vertex/fragment shaders with push-constant light data (direction, color, ambient).
- Compute per-face normals in ObjLoader and GltfLoader for flat shading.
- Add Transform.TransformNormal() using inverse-transpose of the model matrix.
- MeshRenderer builds world-space normals and pushes light constants each frame.
- Recompile SPIR-V shaders.

2026-06-16 20:18:20 +03:00

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