Add an ability to look at hands and deck similar to graveyard

Currently, there is no way to check the deck or hands like in Arena, if something gets shuffled into the deck, like 3rd from the top - you can only keep this information in mind. If someone reveals a card from their hand - there is only an option of keeping window with a revealed card. I propose an improvement:
You can look at the deck and hand at any time, just like the graveyard, however all cards are shown facedown. If a person reveals a card from their hand - everyone can see the face of the revealed card. If you look at other players' hands with cards like thoughtseize - cards you looked at would be visible only to you. If something gets placed in a specific position in the deck (Approach of the Second sun, for example) - everyone can see the face of this card while looking at your deck.
This may be somewhat hard to implement, but that would be a decent qol improvement which could also help with the reduction of visual clutter

No files, tests, or entry points are named. Start by finding how the graveyard is viewed and how revealed cards are displayed, then trace the corresponding deck and hand behavior. Done should cover facedown deck and hand viewing, viewer-specific visibility, and visible cards revealed or placed at a specific deck position.

Written by the indexing model from the issue text.