Looking for low-mess wild bird feeder or birdseed recommendations

I live in an apartment on the third floor, and have a cat. She loves watching birds from our balcony, so we got her a bird-feeder to put in our balcony.

It has done a great job of bringing in more birds (primarily finches and sparrows) for her to watch, except the sunflower seeds we got for it result in an extreme mess all over the balcony and I worry our downstairs neighbors likely hate us as a result, so we’ve taken it down.

Wondering if anyone has recommendations for a bird feeder or bird seed that would be less messy? Or should this just turn into a “when we move to a first-floor apartment or a house” sorta dream.

Unfortunately, my wife is allergic to peanuts, so any bird seed that is made with peanuts (and from what we’ve seen, almost all are) is not an option.