Navidrome Discord RPC icon support

[flysqu]

What do you want to be added?

Currently discord rpc icons only work on jellyfin. Would be nice to have this on navidrome too. I understand if this is a unpassable limitation.

Additional context

This is the if statements responsible for this behaviour (Line 58 - 69)
https://github.com/jeffvli/feishin/blob/340344b791bbbed7f23ede2fb1d6170c22ebcef7/src/renderer/features/discord-rpc/use-discord-rpc.ts#L58C1-L69C10

This is a Navidrome specific feature

[iiPythonx]

Part of this limitation was discussed in #515 (comment), as sending the Navidrome image URL to discord would leak your credentials (as they're sent inside of the url). The main hurdle is still the fact that your Navidrome server would need to be publicly accessible, otherwise Feishin would need to use a service like imgur to act as a middleman.

[kgarner7]

Closing as duplicate of #341 (the comment from iiPythonx is still correct though).