I highly recommend checking out the Longform plugin for rearranging sections of writing projects. See the relevant docs: longform/docs/MULTIPLE_SCENE_PROJECTS.md at main · kevboh/longform · GitHub
And I also recommend the Lineage plugin for a ginkgo-like writing interface.
As for a discrete page view, I don’t think you’ll find that here, since markdown is a plaintext format. Best I can think of is to preview a PDF render using Quarto’s preview command, but that is a bit involved, and probably not that you are after.
For table of contents with numbers, I use a combination of the Number Headings plugin and the Automatic Table of Contents plugin, which works well for me. However, there’s also the option to use Dataview, for which there is a neat solution here: Self-Upgrading In Document Table of Contents Plugin - #5 by AlanG