I have one behind my TV that controls LED lights, although that may count as electronics. I’ve used PIs many times for when I just need a cheap computer doing computery things such as playing audio from spotify out of a speaker. They’re small enough to fit pretty much anywhere with the help of some velcro.
TIL about YSK
Findroid is a complete rewrite of the Jellyfin app, merging it into the official one is unfortunately not feasible.