SAN JUAN, Puerto Rico — The U.S. Department of Homeland Security on Wednesday granted a “temporary and targeted” Jones Act waiver for Puerto Rico, allowing the island to immediately receive shipments of badly needed fuel as it attempts to recover from the destruction left behind by Hurricane Fiona. The decision ends days of pressure from island leaders and U.S. lawmakers to grant an exemption to the act, which prohibits foreign ships from delivering supplies from one American port to another. It disproportionately affects Puerto Rico because it is an island and heavily relies on shipping impor…