Rework sidebar selection

Summary:
- Make sure newly connecting apps are automatically selected
- Improved the sidebar UI by using more consistent, spacious styling, and giving some more attention to error states

Reviewed By: passy

Differential Revision: D18505636

fbshipit-source-id: 18b2c8e78be13aabb3a54c60553f6b0d1e613b27

src/utils/icons.js

@@ -32,6 +32,7 @@ const ICONS = {
   'magic-wand': [20],
   'magnifying-glass': [16, 20],
   'minus-circle': [12],
+  'mobile-engagement': [16],
   'question-circle-outline': [16],
   'star-outline': [12, 16, 24],
   'triangle-down': [12],
@@ -47,7 +48,7 @@ const ICONS = {
   desktop: [12],
   directions: [12],
   internet: [12],
-  mobile: [12],
+  mobile: [12, 32],
   posts: [20],
   profile: [12],
   rocket: [20],