Add changelog entry for #13669 (BibTeX copy button regression fix)

Author: AJBogo9

news/changelog-1.10.md

@@ -6,6 +6,7 @@ All changes included in 1.10:
 - ([#14281](https://github.com/quarto-dev/quarto-cli/issues/14281)): Fix transient `.quarto_ipynb` files accumulating during `quarto preview` with Jupyter engine.
 - ([#14298](https://github.com/quarto-dev/quarto-cli/issues/14298)): Fix `quarto preview` browse URL including output filename (e.g., `hello.html`) for single-file documents, breaking Posit Workbench proxied server access.
 - ([rstudio/rstudio#17333](https://github.com/rstudio/rstudio/issues/17333)): Fix `quarto inspect` on standalone files emitting project metadata that breaks RStudio's publishing wizard.
+- ([#13669](https://github.com/quarto-dev/quarto-cli/issues/13669)): Fix BibTeX copy button in citation appendix not visible due to missing `div.code-copy-outer-scaffold` wrapper, a regression from 1.8. (author: @AJBogo9)
 
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