Version 1.0 of the Notes page is done, I'm pleased with how it's come together. I'll probably tweak the layout and spacing but it all works. Late last night I wrote myself a quick 'To Do' note about adding an Archive but, within about 5 minutes, had it in and working — it was simpler than I initially thought.
Here's a quick demo video showing the key features:
Titles and labels are not compulsory. I may add an option to collapse all notes to just the title (or first line of the note itself if no title) to fit more on the screen, and will probably add clickable indications of what labels each note has assigned in the main view.