Add split-view styles and markup inspired by Chrome dev tools
Redesign nav to be consistent with Chrome dev tools
Add sidebar-toggle component
Improve drag-handle component
Add resizable-column component
Render toolbars in routes using TabRoute
Improve consistency of toolbar components
Simplify notice styles
Use a nested split view for model types and records
Rename .split-view to just .split
Simplify app states and css classes
Redesign object inspector to be consistent with Chrome dev tools