I’d generally tell you to just suck it up and read the VN, but I’m feeling generous today
- No, the curse was never broken. It is heavily implied that Yukito, as Sora, would take to the skies in his new form to seek Kanna and free her from the curse, while the curse will continue for these sad humans. It is also implied that the curse will continue with those two children on the beach, but unlike the case of everyone before her, the girl on the beach has hope that she may still experience happiness despite this, thanks to the boy that is with her.
- Misuzu never really had wings. At least, not physically. Her “wings” are just manifestations of the memories of the winged beings pouring into her, those memories strongly attached to having wings. So while she does feel phantom pains over not having wings, she doesn’t actually physically have them. All the pictures of Misuzu with wings are simply artistic representations.