Playground improvements

[lowlighter]

Scope

www

What do you want to happen?

• Use the browser settings tab to:
  • Toggle matcha.css
  • Toggle iife mode (so it's possible to experiment with the ESM version)
  • Choose which directives to load (rather than using the defaults)
• Add new tabs to let choose across multiple examples (similar to the homepage)
• Maybe use the back arrow to "reset" the example
• Be able to change the size of the view/editor
• Add more examples (maybe re-add back the ones from https://github.com/lowlighter/mizu/blob/2605f9dcede9b5744667dd3998069689c9e61701/www/html/mizu/examples.html)
• Fix CSS issue with scrolling in error debugger
• The code editor may be misaligned with the syntaxic highlighting layer which can cause text offset when selecting code

I have searched for existing issues

Yes