Added a default username that persists across games when set

[zhiyi-zhang-duke]

This code change adds a default_username to the localStorage that is only set when the user updates their username to something that is not a randomly generated name. This value is then checked when other games are loaded and if it is set, is used instead of the randomly generated name.

Here's the state of local storage after a new game is created:

Here's the state of local storage after the username is updated:

Here's the state of a new game after the username_default is set:

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Name	Status	Preview	Comments	Updated (UTC)
downforacross.com	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 16, 2023 5:12am

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[stevenhao]

looks good!