Login improvements

[ferostabio]

There were two issues in the login flow:

• Init / reconnect were called twice.
• There was code in onOnboardChange that triggered a logout every time the app loaded, so the Connect wallet button flashed for a bit.

Tested a number of times, but we should all do it a number of times in case there are any side-effects or something I'm missing.

[ferostabio]

After doing the first batch of (minor, granted) changes, address still took an average of 1.75 seconds to load, when all major projects load it almost instantly.

I went through @web3-onboard's rabbit hole and couldn't find any way to speed up onboard.connectWallect(). I started looking at the different sub packages of them we already use, and realized that they offer a useWallets hook that, when implemented inside a component, it shows the connected wallets right after loading.

A couple of comments:

• We weren't saving the ens name during the connection, only afterwards.
• The hook can't be called before initiating @web3-onboard, reason I added the property and safety checks.
• I replaced the onOnboardChange with the hook.
• I took the chance to clean the auth.storea bit.