Add link sharing for specific lesson steps in mobile app for Discord assistance

**Is your feature request related to a problem? Please describe.**

Currently, on the mobile app, there isn't a way to share a specific step from within a lesson. This becomes an issue when campers post questions on Discord needing help, but they're unable to share a link to the exact step they're struggling with. As a result, they often resort to sharing multiple screenshots of the lesson requirements or the code they've tried, which can make it more difficult and time-consuming for moderators and peers to offer help.

**Describe the solution you'd like**

Ideally, there would be a button available within the lesson steps that, when pressed, would copy the URL of the said step to the clipboard. Campers could then easily paste this link into Discord (or other platforms) when seeking help. This would streamline the process and allow moderators or other community members to quickly access the exact step the camper is stuck on, making it easier to provide targeted assistance.

**Describe alternatives you've considered**

Currently, when campers are stuck on a step, they are given the option to either create a post on the forum, reset the step, or view the console. One alternative might be to extend the existing "create a post" functionality to include the option to share to Discord, allowing campers to easily generate a link they can share in the appropriate Discord channel with a customisable message [template example](https://discord.com/channels/692816967895220344/1033845883822948502/1291056122010140763).

**Additional context**

I don't have specific examples or screenshots of the feature request, here are a couple of very recent examples that campers often share in Discord.
These generally involve screenshots of the lesson requirements or the code they're attempting, which could be streamlined if they had the ability to share a direct link to the lesson step
[example-1](https://discord.com/channels/692816967895220344/718214639669870683/1291363690511204474)
[example-2](https://discord.com/channels/692816967895220344/718214639669870683/1291365162280030290)