feat: add keyboard support

[felixk101]

Adds keyboard support (Enter, Backspace and Letter Entry)

Closes #9

[ConorSheehan1]

Hi @felixk101

Could you change the handler to this

const onKeyPress = (e: KeyboardEvent) => {
  const key = e.key.toLowerCase();
  if (key === "enter") return submitGuess({ $t: t, guess: userGuess.value });
  if (key === "backspace") {
    userGuess.value = userGuess.value.slice(0, -1);
    return false;
  }
  if (key.length === 1 && store.availableLetters.includes(key)) {
    userGuess.value += key;
    return true;
  }
};

Also, did you see my other comments?
Just opened this pr in an incognito window and I couldn't see them, so wondering if you got them at all. They basically said the same as above.

[ConorSheehan1]

Thanks for doing this! I probably won't have time to review this properly for a couple days, but a few changes I'd want to see in the meantime are:

1. Triple equals for comparison
2. Remove console.log
3. Guard clauses instead of nested if statements.

If any of those aren't clear, I can give examples once I'm back at my computer (I'm writing this on a phone).

[ConorSheehan1]

What I mean is something more like this:

const onKeyPress = (e: KeyboardEvent) => {
  const key = e.key.toLowerCase();
  if (key === "enter") return submitGuess({ $t: t, guess: userGuess.value });
  if (key === "backspace") {
    userGuess.value = userGuess.value.slice(0, -1);
    return false;
  }
  if (key.length === 1 && store.availableLetters.includes(key)) {
    userGuess.value += key;
    return true;
  }
};

If you just copy the block above into your pr I'd be happy to merge tbh.
Happy to listen to arguments for different approaches either.

[ConorSheehan1]

I guess these comments only submitted now since I added a new comment through the request changes dialog 🤦‍♂️
For the record I'm pretty sure I added the first comment the day you opened the pr, and the second one a few days later. What a pain

[ConorSheehan1]

It's been a fairly long time now so I've gone ahead and done this myself. Thanks for your contribution though!