Add changelog entries for #14281

Regression fix: transient .quarto_ipynb accumulation during preview.
Command improvement: eliminate duplicate context creation on startup.

Author: cderv

news/changelog-1.10.md

@@ -3,6 +3,7 @@ All changes included in 1.10:
 ## Regression fixes
 
 - ([#14267](https://github.com/quarto-dev/quarto-cli/issues/14267)): Fix Windows paths with accented characters (e.g., `C:\Users\Sébastien\`) breaking dart-sass compilation.
+- ([#14281](https://github.com/quarto-dev/quarto-cli/issues/14281)): Fix transient `.quarto_ipynb` files accumulating during `quarto preview` with Jupyter engine.
 
 ## Formats
 
@@ -12,6 +13,10 @@ All changes included in 1.10:
 
 ## Commands
 
+### `quarto preview`
+
+- ([#14281](https://github.com/quarto-dev/quarto-cli/issues/14281)): Avoid creating a duplicate `.quarto_ipynb` file on preview startup for single-file Jupyter documents.
+
 ### `quarto create`
 
 - ([#14250](https://github.com/quarto-dev/quarto-cli/issues/14250)): Fix `quarto create` producing read-only files when Quarto is installed via system packages (e.g., `.deb`). Files copied from installed resources now have user-write permission ensured.