It was a long, long day of prototyping but I have finally produced a web app that can post to Mastodon and, with hope, other ActivityPub servers.
This app will purposefully support only the authoring of posts to the exclusion of showing the usual post feeds. For the purposes of threading, it will still provide access to a feed of one’s own posts and another one of replies to one’s own posts. This will allow me to share my thoughts without getting sucked into endless feeds.
Wish me luck!