<p>Chinese superstar Fan Bingbing&#8217;s latest role puts her at the center of an unusual dynamic: a Chinese caregiver drawn into the fixation of an aging, stroke-paralyzed Japanese widower. &#8220;Diary of a Mad Old Man,&#8221; Wayne Wang&#8217;s adaptation of Tanizaki Jun&#8217;ichirō&#8217;s 1961 n</p>