Devise a sane UI for viewing assets on many chains

Right now, in the frontend in Account.svelte, we're showing the NEAR account at the top level and merely listing every asset it detects from the NEAR account using Listbalances.svelte. However, soon we will be adding support for other chains, so that will no longer do.

While in theory we could totally just get all of the assets from every chain using the new interfaces in libs/interfaces and stick them into a list, that probably would get very cluttered and annoying to use very quickly.

We could also provide a way to "select" and/or filter which chain(s) you want to see assets from, but what of the potential a user has to have multiple accounts on possibly all of the chains? Or perhaps it's better to have multiple filters so you can filter by account, by chain, and/or even by "app"?