If you're seeing this, then posting from the UI works.
The UI is using service-side HTTP rendering, so there's nothing fancy going on here. I've chosen to use Boostrap for the frontend. It's a little traditional but hey, it looks good. I can't post a screenshot of the UI as Weiro doesn't have attachments yet, but I will once I have attachments working.
The new post should have been saved in the Sqlite3 database, which should trigger a rebuild of the site and a publish to Netlify. The existing posts should still be there too. At the moment, the publishing is done inline, which won't be the case for long, but I want to make sure the publishing flow is working properly.