feat: 쿠폰 등록 후 마이페이지가 새로고침 되도록 수정

SodaLive/Sources/MyPage/Can/Coupon/CanCouponViewModel.swift

@@ -19,7 +19,7 @@ final class CanCouponViewModel: ObservableObject {
     
     @Published var couponNumber = ""
     
-    func useCoupon() {
+    func useCoupon(onComplete: @escaping () -> Void) {
         if !isLoading {
             isLoading = true
             repository.useCanCoupon(couponNumber: couponNumber)
@@ -46,6 +46,7 @@ final class CanCouponViewModel: ObservableObject {
                             }
                             
                             DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
+                                onComplete()
                                 AppState.shared.back()
                             }
                         } else {