lezer playground - improvements

[adminy]

Amazing playground, fun to be had with it.

I like how the tree on the right highlights where in the source code on the left.

I want to push this further, also highlighting the rules used to parse this tree part.

Possibly even highlight what highlights its using as that is part of the 4th column.

Highlighting is very useful, lezer is capable of parsing it in steps rather than all at once and I was wondering if also we could have a step through buttons to interactively parse.

Also I work off a small screen sometimes and I've come to realise that it'd be better suited to have tabs instead of the 4 split view, and if we have tabs then you can have a 5th column for yet another purpose.

I know I'm being slightly ambitious but let me know if any of these you'd also be willing to help with.

Thank you.