I have a long string without whitespace (like a DNA sequence). I would like this to automatically be broken over multiple lines when the page edge is reached, but without hyphens:
Typst doesn’t currently have a proper way to do this, see #674.
The best you can do right now is to use a regex show rule, to insert zero width spaces (\u{200B}/#sym.zws) between the characters of your long strings. This has the very bad side effect, that search does not work in most pdf viewer.