Make game sessions persistent by storing the answers in localStorage

[chowder]

Each session would be good until midnight GMT when presumably a new puzzle will be released.

[0xSk3ttch]

Put a TTL in localStorage and constantly check whether current time has reached the TTL? I can pick it up if you want. Just curious if that's how you'd go about it.

[chowder]

So I'd imagine each 'session' would be represented as an object in localStorage, containing:

• The time (or day) for which the session was started (in UTC)
• The time remaining from the last session
• The answers from the last session

Validity for the session would be checked checked at App mount time, if the session was made in the same day (additionally check for whether each answer in the cache is valid).

If a valid session was found, the welcome screen would be presented with either a 'Resume Session' or 'New Game' option.

The goal being that someone should be able to simply close the window and come back to it later.