Eric Ciotti, 60, led the first round with 43.4 percent of the vote. The incumbent mayor, Christian Estrosi, a former industry minister under former right-wing President Nicolas Sarkozy, scored just over 30 percent and now faces a battle to claw his way back in Sunday’s runoff. “The people of Nice have expressed a desire to turn the page … The time for change has come,” a triumphant Ciotti said after the first-round vote. His lead was fueled by local rivalries, scandal and a feud with Estrosi that stretches back decades. The campaign took an ugly turn when a pig’s head, alongside a printed slur and a Star of David, was tied to the gate of Estrosi’s home — seen as a particularly gratuitous attack since his wife is Jewish. The case has now become even murkier. Estrosi initially blamed political opponents, but investigators are now exploring whether people within his own camp may have orchestrated the crime, the prosecutor said this month. Two arrests were made. Estrosi says he is the victim of “manipulation” and …