Sidenav becomes a full-screen overlay on mobile with slide-in animation.
Dialog goes full-screen on small screens. Settings dialog gets a mobile
nav with hamburger menu. Touch targets and text sizes scaled up for
mobile. Slider gets visual checked/unchecked colors. Sidebar auto-closes
on mobile route navigation. Resize handle hidden on mobile.
I should have split this into two commits, but I found the issue with the
settings buttons *after* I changed how the model selector worked, so its
all in this single commit.
This commit adds message editing as a feature. To accomplish this, the settings
dialog was refactored into a singleton and now the message edit and settings
use the singleton where appropriate.
zoeissleeping
