I’m running Navidrome on my Raspberry pi (4). On my phone (Pixel 8) I use Symfonium to connect with Navidrome. When I’m travelling I use Tailscale + Mullvad + Symfonium to play music from my rpi.

Firefox & Thunderbird Collect User Data by Default (in Violation of European Law)

Have you tried Tempo (FOSS)?

Forgotten apps: Lawnchair(Release) together with Arcticons. Very minimalistic!

Maybe you can try Discreet Launcher. It’s 1.41 MB.