Function find_best_candidate 

pub fn find_best_candidate(
    origin: &FocusableArea,
    direction: CompassOctant,
    candidates: &[FocusableArea],
    config: &AutoNavigationConfig,
) -> Option<Entity>

Finds the best entity to navigate to from the origin towards the given direction.

For details on what “best” means here, refer to AutoNavigationConfig, which configures how candidates are scored.