Shares opened lower in Europe on Thursday after a mixed session in Asia, where a rebound in oil prices eclipsed another broad rally on Wall Street. South Korea’s Kospi soared 8. 4% to 7,815. 59, helped by strong buying of technology shares such as Samsung Electronics, which gained 8. 5% after its labor union and management reached an agreement late Wednesday that averted a potentially costly strike. Shares in SK Hynix, a computer chipmaker partnering with Nvidia, surged 11. 2%. The advance a...