@andrei0x309
A few things:
1 the guide only shows how to use Next.js/React, here is a svelte kit starter, which exposes SDK, and wallet and has 2 demo frames, one of them pretty complex ( get rewards from merkl LQ protocol):
https://github.com/andrei0x309/frames.flashsoft.eu
2 You can generate JFS with Clear Wallet directly
3 SIWF on desktop should provide a way for people who imported their custody PK to sign in without mobile because hundreds of users have imported the key to log in on warpcast.com without mobile, and with the custody PK in any wallet you could do SWIF on desktop without mobile.