fix: challenge view bugs

[Nirajn2311]

Checklist:

• I have read and followed the contribution guidelines.
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• I have tested these changes locally on my machine.

Root cause of the reset code bug - https://arc.net/l/quote/bbawfrzp

The localhost server is not shutdown before the new one is created as the previous view is not disposed until the new one is loaded when we use pushReplacement

[Nirajn2311]

There's still one more bug - if user logs in from the pass widget then the completion percentage is not updated to the right value

This bug is also present in the current prod version of the app also

[huyenltnguyen]

Hey Niraj, I just realized that there is a fileKey property that we could perhaps use in place of having to manually write ${name}.${ext}. fileKey is basically ${name}${ext} (without the dot) but provided by the challenge JSON so we can just consume directly.

I'm not suggesting we make the change here, just wanted to mention it as I was hovering on the ChallengeFile class and noticed it 🙂

[Sembauke]

Do you want to fix that one as well then in this pr @Nirajn2311 ?

[Nirajn2311]

Yea I'll fix it in this PR

[Nirajn2311]

This PR's done