I use Joplin, which is a cross-platform FOSS notes app featuring E2EE. It's not a perfect solution and not much of a text editor, but it's the right direction.

I use Joplin, which is a cross-platform FOSS notes app featuring E2EE. It's not a perfect solution and not much of a text editor, but it's the right direction. Everything else is explicitly saved (without secrets) or just an ephemeral buffer in Neovim.