If one bakes pizza with cheese in a oven, can they then bake meat in the oven if 24 hours have passed? If no, is it permitted if you wrap the meat item so no steam escapes?
Yes, this is permitted.
An oven doesn’t become “dairy” after pizza (a dry food) is baked in it, with the exception of parts that actually came into contact with the pizza.
Concerning covered foods, see Shulchan Aruch, Yoreh De’ah 108:1; Ksav Sofer 54; Igros Moshe Yoreh De’ah 3:10; concerning dry foods, see Igros Moshe Yoreh De’ah 1:40 (and 1:59, concerning baking a challah) based on Pischei Teshuvah 92:6.