This live-action version of E.B. White's novel doesn't have quite the magic of, say, Toy Story. Instead of entertainment the whole family can be enthralled with, Stuart Little is squarely aimed, and successfully so, at the 4- to 10-year-old watcher. Does this make it a bad family film? Not in the slightest. The gee-whiz visual effects (created by original Star Wars wizard John Dykstra) and the …