enlarge image on click
to use in components for most images that are not icons, especially in chat böbbles.
- create fullscreen lightbox overlay with "X"
- open on click
- close on click
- close on "X"
- possible conflict with "melden" in chat
- zoom and pan via touch. according to research, this needs to be done with javascript.
- Here is a Zoom component for Svelte that already does that (with zero dependencies): https://github.com/vaheqelyan/svelte-zoom#readme