Samsung Electronics’ trade union plans for 48,000 workers to walk off the job on Thursday after efforts to clinch a deal on bonus payments fell through, threatening the health of South Korea’s economy and the global supply of semiconductors. Union leader Choi Seung-ho said that the 18-day strike would go ahead as management had not come round on one remaining sticking point in talks mediated by the government. “I want to make clear that we had accepted the final proposal presented by...