This looks impressive. Nice to see a modern, sleek app built with Qt + QML. I moved on from raw Qt after my last job, will take a look at using QML.

Looks great! I'll follow along so I can try it out if syntax-aware code blocks and callouts are ever supported

Great! They will be supported earlier on my non-FOSS note-taking app with a block editor (get-notes.com). So you can follow their as well.