Smooth Third Person Camera

Improved third-person camera smoothing rendering behavior

• Mitigated terrain and chunk rendering holes that could appear while using camera smoothing in third-person view.
• Rebuilt the camera culling frustum after applying the smoothed camera position, reducing mismatches with LOD and rendering mods such as Voxy.
• This does not guarantee full compatibility with every LOD or shader pipeline, but it should reduce visible rendering gaps in the reported setup.