Crash on iPadOS 18.0+ using presentationstyle = .bottom

[sharpwestOFW]

Due to the changes made to UITabbar in ipadOS 18.0+, SwiftMessages is crashing when trying to set the constraints for the bottom view. I believe this is an issue specifically with the function bottomLayoutConstraint(view:, containerView:, viewController:) in Presenter.swift. The specific crash is because we are trying to attach an anchor to the top of the tabBar which no longer exists on ipadOS 18+. I think it should check if there is a tabBar top constraint before trying to attach the view.