Per-wallet page: Wallet scorecard as social media preview image

[polymutex]

Blocked by: #77

Once wallets have scorecards, it would be great to have wallet pages declare their "social media preview image" (via OpenGraph metadata) as a pre-rendered image version of the wallet scorecard. This will make it such that sharing a walletbeat per-wallet page on social media shows the wallet scorecard inline.

There may be an opportunity to take this idea further in the context of Farcaster frames, but I haven't thought too deeply about this yet. If someone has ideas, please chime in.