The US is proposing annual approvals for exports of chipmaking supplies to Samsung Electronics Co. and SK Hynix Inc.’s factories in China, a compromise aimed at preventing disruptions to the global electronics industry after Trump officials revoked Biden-era waivers that let the companies more easily get such shipments.Officials in the US Commerce Department last week presented to Korean counterparts a “site license” idea to supplant indefinite authorizations the chipmakers secured under the pre...