Highlighting the current chapter in the interactive tutorial chapter selection dropdown

Describe the problem

I sometimes find myself going back and forth between chapters in the tutorial and it can be difficult to find which chapter (option) I am on currently. It would be nice to have the currently active chapter highlighted the select options somehow.

Describe the proposed solution

I don't think it would just be a case of adding a state variable to keep track of the id of the currently active lesson and apply a conditional style to that option to that id from the dropdown? I haven't looked at the code for the docs but I'm happy to go back to it and try and implementing it myself!

Importance

nice to have

[WarningImHack3r]

Looks like this should be opened in https://github.com/sveltejs/svelte.dev/issues instead

My bad, will move it there!