feat(dialog): add post-game dialog message

The dialog notifies you of a victory, defeat, draw, or forfeiture. This needs
a tiny bit of extra work, because the clients are still unaware of each other
in terms of profile details, even though the server handles this. So, the
next step is to make each dialog mention the appropriate player's name.
fix(game): mention opponent name in victory messages

As mentioned in previous commit, opponent names needed to be shown. This one
still has the problem that it won't update the name in the case that it
changes, so that needs to be worked on.