Matthew Schaefer’s historic rookie season is one step away from being immortalized in hardware.  During a live broadcast of the NHL draft lottery Tuesday night, the 18-year-old defenseman was announced as a finalist for the 2026 Calder Memorial Trophy, which is awarded annually to the player “selected as the most proficient in his first year of competition in the NHL.”  Schaefer was announced alongside Montreal’s Ivan Demidov and Anaheim’s Beckett Sennecke.  Matthew Schaefer (48) reacts to a goal by Anders Lee (not pitured) during the first period of the Islanders’ 4-3 loss to the Blackhawks on March 24, 2026 at UBS Arena.…