Show game time in lobby

[Wikignometry]

This PR addresses issue #6994 around showing the game time in lobby. The idea is that it would help users figure out if a game is worth watching or not.

As shown in the screenshot below, the expected behavior is that it:

• displays the number of minutes a game has taken in the bottom right corner of the game row
• does not display a number if the game has not started

Screenshot:

[NoahTheDuke]

This is cool! Could you make it hover the start timestamp? Some people (myself included) prefer to view the raw time.

[NBKelly]

I'm finding this is actually causing me errors (black screen in the lobby whenever there is an active game).

I can force this to work if I make create-new-lobby in lobby.clj to create a new instant for the date (it's fallback behavior). Otherwise I think this will work for some people (if their browser doesn't support whatever date function we use? I'm not sure what the conditions are to not send a :date through ws), and will cause black screens if a :date key is passed through the ws connection.

With a tiny bit of deconstruction, I'm seeing that the :date we get from game is some sort of native code not compatible with the instant type.

so:

• type of inst/now as called in the lobby: correct
• date object that my browser is spitting at me (as a string): Mon Jul 01 2024 19:18:02 GMT+1200 (New Zealand Standard Time)
• type of that object: function Date() { [native code] }