feat(iframe): iframe ui updates

[ianlapham]

• update for hiding components when app rendered witin iframe
• example here: https://jsfiddle.net/ianlapham/hme9ucr7/12/

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[moodysalem]

note that these two changes (domain detection and iframe detection) will make our integration tests less reliable for catching issues. we should either a) increase the scope of our integration tests to include both app.uniswap.org and localhost:x + iframe/non-iframe, or b) only test one domain and try to make the iframe stuff work responsively for all devices

[cashewnutz]

Yo we have a direct use case for this fix, I was wondering if there is any update on when this could be pushed.

it seems that this could change the game for us! @moodysalem