When it comes to touch-enabled mice for the Mac, Apple’s Magic Mouse has seen little real competition. Much like it took a swing at the Magic Trackpad with its Rechargeable Trackpad T651a, Logitech is now trying to swoop into that space with its Ultrathin Touch Mouse T631 ($70). Designed to specifically complement Apple’s computers—a separate Windows-ready version is also available—it’s a more compact option, at the same…