- align with system palette
- base color for buttons and preview individually
  to create a visual gap (make them more standalone)
- downsized button config buttons to match up w/ preview
  appearance (and because it was simply to huge for a desktop thing)
- upsized preview to preferably show two elements at once
  (current + 2*1/2context)
- made the titlebar a visible visual element
- label the titlebar "Titlebar"
- move the (altered) hint to the drag-from area
- hint draggability with a pointing hand cursor
- less hardcoded values
- brief animations on button adding/removing

BUG: 337544
REVIEW: 122064