TV scroller buttons / shadows

[phazonoverload]

This PR introduces three changes to the category scrollers on the TV home:

1. Shadows where there is overflow.
2. Buttons to progress users left/right with scroll snap. Important for users without easy ability to horizontal scroll. Disabled and lower opacity when at left/right limit.
3. Adding show count to category title

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[paescuj]

Nice 😍

Non-blocking: I was wondering whether we could find a way to make the actual title stand out a bit from the count, e.g. by making the count a sub header?