Oddbean new post about login | logout here's the github, you can download the .apk and install it. I'm using grapheneOS, too. primal-1.0.3.apk is the files name
Now the only issue I had after that was that this evening until a minute ago, Primal.net (on both GrapheneOS and Brave desktop browser) had something caching and acting as if I was logged in, but would never let me perform actions. so I had disable my signer extensions (Amber on Android and Flamingo on desktop) and will just stay signed in normally w/my nsec until I find a solution. I just use Bitwarden to store my nsec, hopefully that's OK in the meantime.
I had wonky behavior last week. You may try what worked for me to see if that clears out the pipes. https://primal.net/e/note1ea9hyfnaum0q6plgvqkque9c2daxl2fzzevvduq5tp8y30snma5sr2dykz
