feat : Add link sharing for specific lesson steps in mobile app for discord assistance #1295

[Herve176]

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

Closes #1295

[Nirajn2311]

Hi, just like my previous review in your earlier PR. We don't use GetX for state management and instead use Stacked. So I'd suggest you to look at the other views/view models to get an idea of how to implement it.