Not sure, but I imagine that you could spread them in a single layer on a cookie sheet and freeze them if they are in danger of rotting. (Bag them when they are frozen.)
I think commercially-dehydrated cranberries are soaked in cherry syrup before drying.
Personally, I would try lightly mashing them, letting them sit in a little bit of sugar, (orange juice?) then toss them in a pan with chicken and maybe a very light toss of salt. I can't think of anything better than mashed cauliflower for a side. I have never worked with cranberries before, this is something I do with pork chops and apples.
Just as a hunch, I looked up "cabbage and cranberry" and got a few interesting hits.