FocusTrapZone firstFocusableSelector prop is fragile

[jurokapsiar]

Bug Report

FocusTrapZone firstFocusableSelector prop is fragile.

1. it is called selector, but it expects class, as it prepends the selector with .
   -> only prepend . if the string does not start with . or #
2. it allows seting focus to elements outside of the focus trap zone
   -> if selector evaluates to something outside of the zone or to nothing, find the first focusable in the zone

Version

0.33