frames

@gt shipped a bunch of Frame improvements today: 

- Button Redirects, to send users out to websites.
- Clickable images, so users can navigate back to your site.
- Frame Validator, to debug your frames as you build them. 

What else do you want see shipped?

Technowatermelon. Elder Millenial. Building Farcaster. 

nf.td/varun

1) share frame button or option
2) allow silent initial call to frame server for frame caster (even not signed data), so that initial frame view can be populated with caster metadata; for frame viewer I would argue from privacy perspective this shouldn't be allowed

3) any thoughts on how to handle nonce to prevent replay attacks, typically you will attach it to a session on a back-end, although I imagine you can attach it to a fid as well, return it as part of url, let the client sign it and then process it on back-end again.

cc: @v one more, I believe even more important