HN user
Congratulations! Cool app and nice writeup.
Related: what do people use for bilingual (translation) dictionaries (i.e. X-English or English-X)? Most of the apps I have found for the languages I use are full of ads and not very usable. (Translation apps like Google Translate are much better and more usable, but there are some use-cases where a dictionary really is better).
I set up a Mac mini as my HTPC about a year ago, and settled on Jellyfin to manage my media. Overall it's been great, and I'm really happy that Jellyfin exists. I use Kodi for the TV interface, with the Jellyfin for Kodi add-on to link the two [1]. I looked into Plex, but was turned off by how commercial it was and how hard they tried to push their paid services. The big advantage to Jellyfin is that I can start watching a show on my TV, and pick up exactly where I left off on any of my devices (I use the Jellyfin iPhone and iPad apps, as well as the web interface). I can also access my music library through Jellyfin, and at the recommendation of a comment on this post I just downloaded finamp, which seems like a great music player [2].
The initial setup took a bit of work, and there are definitely some quirks, but all-in-all it's worked for me really well. I would wholeheartedly recommend both Jellyfin and Kodi for anyone interested in a HTPC/home streaming setup.
[1] https://github.com/jellyfin/jellyfin-kodi [2] https://github.com/UnicornsOnLSD/finamp
For native Mac apps, there is Platypus that does something similar: https://sveinbjorn.org/platypus
It is somewhat ironic that 2012 PG writes "don't work too much", but 2021 PG writes a long essay on "how to work hard" (at the very top of his essays page), lionizing the idea of non-stop work and expressing disgust at idleness.