feat: Integrate plane_distance into renderer and scene loader

This commit integrates the plane_distance functionality by:
- Adding shared_user_data to Object3D for storing type-specific data.
- Modifying SceneLoader to read and store plane_distance in shared_user_data for PLANE objects.
- Updating ObjectData struct in renderer.h to use params.x for object type and params.y for plane_distance.
- Modifying Renderer3D::update_uniforms to populate ObjectData::params.y with plane_distance for PLANE objects.
- Adjusting blender_export.py to correctly export plane_distance and reorder quaternion components.

A manual step is required to update WGSL shaders to utilize ObjectData.params.y for plane distance calculations.

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