Misc stats and lists fixes

[innatewonderer]

Fixes #794

Only display unique recent listens. I do too sometimes put my favorite song on loop, but I just don't want to be reminded at just how MANY times I listened to it :)

[Bug] To reproduce

If you actually have any of the files locally, listen to a song a bunch of times and observe before and after in /you_user -> Recently Listened To
Another way is to do it in RAILS_ENV=test rails s.

5.times do
   Listen.create(asset: asset, listener: user, track_owner: user)
end

"Ready For Review" checklist

• PR title accurately summarizes changes
• New tests were added for isolated methods or new endpoints
• If this fixes a bug, "Fixes #XXX" is either the very first or very last line of the description.

Before code review and after additional commits during review.

• Update title and description to account for additional changes
• All tests green
• Booted up the branch locally, exercised any new code
• Percy changes are purposeful or explained
• Css changes are happy on mobile (via Percy is ok)

[sudara]

I like the idea of increasing signal, especially on the user's home page there. Unique makes sense there to me.

Hmmm, should we leave https://alonetone.com/sudara/history "intact" or also have it only show unique listens.

@ofsound Any negative consequences you can think of going "unique" here? I guess it means you can't tell who your 15 plays are from if you click through to the listeners on a track. Maybe the PR as is is perfect, sorta showing the "abridged" unique overview on home and full unabridged on /history.

#796 is tangentially related (better separation of self-listens).