Will my mousepad warp or delaminate from laptop heat?

No. Most soft cloth mousepads are made of polyester or neoprene, which don’t warp or delaminate from laptop heat — they just get warm. The real risk is covering the laptop’s exhaust vents with any surface, which can trap heat and choke airflow, damaging the laptop’s internals long before the mousepad. Don’t block the vents; everything else is fine.