The team for the $1.15-billion rebuild of Seattle’s iconic Key Arena, now named Climate Pledge Arena, thought they could breathe a collective sigh of relief at the end of last year. They had successfully completed the mind-boggling top-down expansion of the city-owned venue’s below-grade footprint without disturbing the 45-million-lb landmark lid overhead. But though the biggest headache had ended, many smaller ones were just beginning, thanks to a developer-mandated redesign to make the arena more sustainable and to disruptions in the global supply chain, triggered by COVID-19.