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$ pacman -Ql sddm

Shows me themes are on /usr/share/sddm/themes/

$ pacman -Qo /usr/share/sddm/themes/breeze/

Gives me the package that owns the dir: plasma-desktop

So, to fix it, install plasma-desktop.

-Qo option works even if the file is deleted.

BS is really decentralized. You only need some 5 TB storage to run a relay and there is no other AppView besides the one run by Bluesky ro bring them all and in the darkness bind them.