Go back to the cage phase. Eventually, most rabbits and cats get used to each other. It's just a matter of time and, in some cases, supervision. This is by far the most common scenario. Cat and rabbit meet, indoors.
Rabbit charges up to cat.
Cat, non-plussed, backs off. The cat may even run from the rabbit. Most rabbits will chase only till they feel they've made their point. These two guys require no human intervention. Once Daphne feels she's asserted herself to her satisfaction, she and Felix can become roommates, friends, or soulmates.