Replace our custom iframe solution for Swap with a new Li.Fi widget

[maxaleks]

Docs: https://github.com/lifinance/widget/blob/main/packages/widget-embedded/README.md
Integration example (EVM): https://github.com/lifinance/widget/tree/main/examples/vite-iframe-wagmi

[maxaleks]

The new Li.Fi widget requires wagmi v3, but reown currently only supports wagmi v2 and it seems they're in no hurry to fix it. Related issue: reown-com/appkit#5371