chore: add changelog entry

Author: mcanouil

news/changelog-1.7.md

@@ -4,3 +4,7 @@ All changes included in 1.7:
 
 - ([#11532](https://github.com/quarto-dev/quarto-cli/issues/11532)): Fix regression for [#660](https://github.com/quarto-dev/quarto-cli/issues/660), which causes files to have incorrect permissions when Quarto is installed in a location not writable by the current user.
 - ([#11509](https://github.com/quarto-dev/quarto-cli/issues/11509)): Fix link-decoration regression in HTML formats.
+
+## `typst` Format
+
+- ([#11578](https://github.com/quarto-dev/quarto-cli/issues/11578): Use fraction type for width to prevent overflow in layout.