What do you gift a cat?

My sister adopted a cat a few months ago, whom I'll finally be meeting next week.

I missed my sister’s bday so to butter her up I decided to take a gift for not only her but her cat as well.

But who knew finding a gift for a cat would be this difficult.

Originally I planned a visit to a cat café, but idk how social her cat is. Another thing I'm thinking of is a charm bracelet/necklace for my sister and a matching charm that can go on her cat's collar.

So do you have any idea where I could get something like this? Or some other gift for a cat parent? I’d really appreciate any suggestions, big or small, store-bought or homemade.