feat: Implement hybrid rendering with SDF primitives

- Added SDF logic for Sphere, Box, and Torus in WGSL.
- Implemented hybrid normal calculation (analytical for sphere, numerical fallback).
- Updated Renderer3D to dispatch object types to shader.
- Updated test_3d_render to display mixed SDF shapes (Sphere, Torus, Box).
- Added BOX to ObjectType enum.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/3d/object.h b/src/3d/object.h
index f4215aa..ccbb1e1 100644
--- a/src/3d/object.h
+++ b/src/3d/object.h
@@ -10,7 +10,8 @@ enum class ObjectType {
   CUBE,
   SPHERE,
   PLANE,
-  TORUS
+  TORUS,
+  BOX
   // Add more SDF types here
 };