Barry Jackson of the Miami Herald reports:  The Heat has extended coach Erik Spoelstra’s contract in the wake of Spoelstra and all the employees in basketball operations, including president Pat Riley, accepting voluntary pay cuts to eliminate the need for layoffs. Spoelstra also confirmed that forward Michael Beasley — who left a Houston rehabilitation facility Sunday — was at AmericanAirlines Arena on Monday, where players are working out informally, and has improved his game significantly this summer.