fn closest_free_position(
allowed_centers: &[WorldAabb],
preferred_center: DVec3,
expanded_collisions: impl IntoIterator<Item = WorldAabb>,
) -> Option<DVec3>fn closest_free_position(
allowed_centers: &[WorldAabb],
preferred_center: DVec3,
expanded_collisions: impl IntoIterator<Item = WorldAabb>,
) -> Option<DVec3>