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Explore a Scala 3 library designed to simplify and accelerate user interface development for backend systems. Learn how to create internal UIs in just a few hours, enabling non-technical users to solve their own problems. Discover a combinator library for expressing user interfaces, implemented with a Scala 3 twist that solves the "expression problem" using union types. Examine how generic derivation can be used to quickly construct forms while allowing for incremental customization. Through real-world examples, dive into the design and implementation of this library, focusing on general patterns and Scala 3-specific features. Compare this approach to alternative systems and understand how Scala 3's scalability is showcased in this layered design, offering a spectrum of development styles from automatic generation to full customization.