feat(it-just-works): show loading indicator and failure error message in sample wallet

[arein]

Currently after typing in a wc2 URI and clicking connect there is no loading indicator. In web3modal UI tests you can see that often nothing happens without an error message. This blocks parallelizing and improving quality of the web3modal tests.

Expected behavior:

1. visible loading indicator
2. timeout with good error message if the session approve model doesn't pop open within X seconds

[bkrem]

@ganchoradkov I think we can close this? There's an ellipsis loading indicator on the Connect button now from what I can see