Link to specific accounts from the address bar

[Tbaut]

closes #266

This was such a tricky change, that I thought it should go with a full suite of tests.
Now because our cypress extension plugin didn't actually support what I needed, I had to make it evolve, and allow users to connect an extension, then refresh the page without the need to connect again.

This made the scope of this PR explode.. but it was only in order to actually push many many tests. So I hope it alleviates the annoyance.

Note that there's some refactoring to do to make the extension plugin easier to use. I'll do this in another PR see #433

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Submission checklist:

Layout

• Change inspected in the desktop web ui
• Change inspected in the mobile web ui

Compatibility

• Functionality of change validated with a connected account with multisig
• Applicable elements hidden / disabled for watched multisigs / pure
• Looks good for solo multisig
• Looks good for multisig with proxy

[asnaith]

Really fantastic to deliver this with the supporting UI tests! Thank you for capturing all of those different scenarios

[Tbaut]

I think one area to improve is the amount of info and explanations when users land on the error page. They may feel lost and the "reset" button may feel weird. Open to suggestions (maybe for a follow-up pr).

We should probably have a "why do I see this" accordion or something explaining that they landed here with an account selected, that they don't have neither in their Multisig list, nor as watched accounts. And then we can do some check and suggest to connect their accounts if not done or watch the account if not done yet.

[Lykhoyda]

Looks good! Great feature!

There is a small suggestion about the button name when the account is not found and typo to fix. The Transaction test in Cypress will not pass due to Roccoco, so needs to be skiped for now (known issue)