The last time the formidable mezzo-soprano Joyce DiDonato appeared at UC Berkeley’s Zellerbach Hall, she concocted a program centered on an off-the-shelf theme labeled “War and Peace,” serving as the justification to string together a splendid collection of arias and laments. Set within a choreographed concert with a fairly substantial mise-en-scène, any pretense of that evening’s concept and symbolism inevitably {…}