Contact - submit button hidden on missing field

[gerbrent]

From a LUP listener, and will likely need more investigation:

Btw the submit button is not reachable, when missing a mandatory field and the notification is shown, for me on mobile with my pixel7pro. Don't know if it's resolution related but I had to put in everything again to send it.

[CGBassPlayer]

Looks like the makers of the contact form updated to use more native buttons and file pickers. This screenshot is from my iPhone X.

I was planning on figuring out how to add more browsers and/or resolutions with playwright after I finished #475.

I will see if there is a way to update the iframe size for mobile vs desktop. But if not, we can just increase the height of the iframe.