Toolbar on the desktop

Fixes #195
Hmm, yes. Of course, this is easily fixed by adding the padding-bottom `if(mobile)`. The reason I didn't do that was

  1. The editor then needs to know an awful lot about the UI around it, rather than just being a standalone rectangle. This is especially a problem when adding more editors, e.g. #189, #192, #129.
  2. It's slightly unclear where the document actually ends.

Also, theoretically you have the same problem on the desktop (you can't access to top-right corner in zen-mode).

Also, there's the somewhat related problem that it isn't very pleasant to type near the bottom of the screen all the time. Word processors solve this by dividing documents into pages, allowing you to scroll to the bottom of the current page. Some text editors (Sublime Text) solve this by allowing you to scroll one screen height past the end of the file. Line numbers indicate where the document stops.

Maybe it's an idea to increase the padding-bottom by more than 55px, and then add a visual indicator of the borders of the document? (E.g. a real border, or make the padding a different color, light grey or so.) OTOH, that'd make it less WYSIWYG.

Thoughts?