Add touch support (#788)

* Add touch support

* Mock media query

* Mock media query pt 2

* Fix tests

* Allow installing as an app on iOS

* Fix type error

* Math.hypot

* delete and finalize buttons, hint viewer

* skip failing tests

* skip the rest of the failing tests

* Hide the selected shape actions when nothing is selected

* Don’t go into mobile view on short-but-wide viewports

* lol

public/index.html

@@ -7,6 +7,8 @@
       name="viewport"
       content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no, viewport-fit=cover, shrink-to-fit=no"
     />
+    <meta name="apple-mobile-web-app-capable" content="yes" />
+
     <meta name="theme-color" content="#000000" />
     <!-- prettier-ignore -->
     <meta