Making implicit context explicit visually in copilot

[SamSaffron]

I wonder how we would feel about a feature that calls out "current context" more explicitly if set?

So for example if context is a selection it could say:

#selection:1:2:33

Then it would be very clear what is going on all the time and you could just edit out implicit contexts if you want to shift gears?

we could even auto fold in the context, so you could expand to see it.

I know gc finds it just kind of wish I could see it upfront

[deathbeam]

I dont really want to make including selection or not part of the user input, not sure. Because selection is a bit more important, its used for diffs etc when not using /COPILOT_GENERATE. And for everything else I added #748 that could add some default sticky prompts as alternative to other implicit configs (like implicit context, implicit agent etc)