Is it a toy project or a serious business application? sea-qt is alright for the former, but that's where it is. It is a new project, and things changing is the norm. And then, you have qt licensing terms..
I would suggest Owlkettle as the better option for production, because it is stable, has an excellent API surface, modern declarative UI, and you get a native build for all desktop platforms. No JS desktop bloat like that of Electron. One thing to note: For macOS, you must use GTK4's Header bar with Popover menus to implement the menu bar for the best UX. macOS global menu bar works only at a basic level in GTK4.
Coding AI tools are very good with GTK generally. You can use them to leverage Nim's gintro library and tackle special cases if necessary.