Small cleanup diff to better organize and make the `InlineEngagement` component easier to read/go through. The two changes to note are
# Renamed `threadInfo` to `sidebarInfo`: I thought that this was a more accurate name since this was holding the sidebar thread info
# Reorganized/moved the styles `unboundStyles` so that the order of the styles went from usage in parent elements/containers to the children elements. Before this the styles were in some random order that didn't make any sense to me
Depends on D8317