This looks very nice!

How long have you been working on this?

I will be releasing hackerman.ai text editor later this year (or ASAP), also somewhat niche product with support for creating/editing lexers (eg for your own languages), able to customize almost everything, set key bindings to use self-defined functions (scripting), and ofc integrated AI features, which can also be customized and added as commands etc.

Built on top of Qt framework.