Improving our "lowest read position" Back button / indicator

Okay, I’ve just pushed out a couple of commits to take a stab at this. They’re deploying now:

https://github.com/discourse/discourse/commit/36449aa2f25025d6786667e205dadcdbaa971d3b

and

https://github.com/discourse/discourse/commit/4dcb29acbf79c2a848300118116644ab4298c3b2

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