Briefly: no, it's a custom reactive UI framework similar to Jetpack Compose. Rust is used for native operations such as accessing file system, launching processes, etc
Interesting that you would use Rust for those operations since the JVM was already presumably giving you cross-platform implementations. Was that a significant performance bottleneck that got alleviated by using Rust, or was there another reason?
Whole architecture of Fleet is distributed, so we need a small binary without dependencies that could be uploaded to the dev container. All the access goes through that binary (even in local case)
