Add top-up modal escape [Fixes #383]

[wackerow]

Description

• Adds closing X to modal pop-up on /top-up page
• Adds "Connect wallet" button to same page if user has not connected, and has exited the modal

Related issue

[Fixes #383]

[hwwhww]

Just commenting on the preview page, it looks great! 👍

Defer to @samajammin on the TypeScript magic.

[samajammin]

Nice @wackerow!

This may have already been an issue (i.e. unrelated from your PR) but I noticed when I'm on a different network other than Mainnet (e.g. Arbitrum), it creates some funky behaviour when trying to connect (nothing happens when I click MetaMask). If I'm on Mainnet, it correctly tells me to switch to Goerli.

Mind making a change here to check if user is on ANY network other than the correct network? If so, we should display that modal to switch:

If you'd like, feel free to create a separate issue for this... ideal logic here might be to auto-switch the network for MetaMask users.

[pettinarip]

LGTM! left a couple of small suggestions, nothing blocking.

[wackerow]

@samajammin Yeah this is another existing issue it looks like. Opened an issue for it, but gonna hold on building it into this PR. Can revisit separately.