not minimal, but there is "iamb- A Matrix client for Vim addicts"

https://github.com/ulyssa/iamb

There's also https://github.com/gomuks/gomuks/tree/master for golang folks (although it's currently doing a transition to being a web client... and then back to being a TUI apparently)

clearly not using bubbletea/lipgloss tho lmao

Good idea!