So just for the sake of completeness, maybe, and since Electron seems to be the most popular solution; what about a website? Fairly ubiquitous across all platforms with the help of Chrome, Firefox, and even Safari or Edge. I don’t think should be dismissed as often as is, consider VS Code on Github.com (hit the period key in a repo and the repo’s code is presented with VS Code in a browser — and it supports syncing extensions — though not all, for example).

To me it makes sense from tne perspective of the work being done in HTML, CSS & JS to make an Electron app. Why not start as a website then desktop?

I get there are certain pieces of functionality not suited for a website; but based on the original post’s question and description it seems feasible.