What do you do when your vibe-coded app looks good but feels unfinished?

Sometimes an AI coding tool can build a beautiful UI in minutes

But once you start using the app, you notice small things that don’t feel right

Buttons behave differently than expected, pages feel inconsistent, or the whole flow is confusing

Making something look good is one thing

Making it feel smooth and reliable is another

For those who vibe code, what do you usually improve first after the initial UI is ready?