[FR] Improve rendering of images too

[filiptrplan]

A lot of the time when writing math in callouts I also want to add my sketches in the callout and it is known that images don't render in Live Preview mode in callouts.

This is annoying as if I want to consult my sketch I need to click off the callout every time.

Maybe it would be possible to implement this in the plugin? Seems like a nice feature to have.