Fix transition bug when the keyboard is presented

This MR improves the transition when navigating from a screen while presenting keyboard.

This should fix the issue: [Registration] UI transition bug when having the keyboard enabled.

What was done

• Refactor code that loads view in OnboardingCodeController and ProfileCodeController:
  • Make sure the view and layout are set up correctly.
  • Avoid using SnapKit.
  • When finished initial setup, call setNeedsLayout and layoutIfNeeded so the view is laid out immediately.
• Dismiss the keyboard on OnboardingPhoneController and ProfilePhoneController before navigating to next screen.

Dismissing the keyboard is not mandatory, but I think it helps to achieve a visually satisfying transition.

Preview

Before	After (fix layout)	After (fix layout + dismiss keyboard)
before	after-1	after-2

Sources/OnboardingFeature/Controllers/OnboardingPhoneController.swift

@@ -79,6 +79,7 @@ public final class OnboardingPhoneController: UIViewController {
       .nextButton
       .publisher(for: .touchUpInside)
       .sink { [unowned self] in
+        view.endEditing(true)
         viewModel.didTapNext()
       }.store(in: &cancellables)