I have:

• searched the issue tracker for similar issues
• installed the latest version of Quarto CLI
• formatted my issue following the Bug Reports guide

Bug description

The repo-link-target option does not work for the button in the sidebar, below the book title, that links to the book's GitHub repository. It only works for repo-action actions, placed below the page's table of contents.

Steps to reproduce

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Actual behavior

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Expected behavior

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Your environment

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Quarto check output

Quarto 1.8.26
[✓] Checking environment information...
Quarto cache location: /home/valdio/.cache/quarto
[✓] Checking versions of quarto binary dependencies...
Pandoc version 3.6.3: OK
Dart Sass version 1.87.0: OK
Deno version 2.3.1: OK
Typst version 0.13.0: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
Version: 1.8.26
Path: /opt/quarto/bin

[✓] Checking tools....................OK
TinyTeX: (not installed)
Chromium: (not installed)

[✓] Checking LaTeX....................OK
Tex: (not detected)

[✓] Checking Chrome Headless....................OK
Chrome: (not detected)

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
Version: 3.12.3
Path: /usr/bin/python3
Jupyter: (None)

  Jupyter is not available in this Python installation.
  Install with python3 -m pip install jupyter

[✓] Checking R installation...........OK
Version: 4.5.2
Path: /usr/lib/R
LibPaths:
- /home/valdio/R/x86_64-pc-linux-gnu-library/4.5
- /usr/local/lib/R/site-library
- /usr/lib/R/site-library
- /usr/lib/R/library
knitr: 1.50
rmarkdown: 2.29

[✓] Checking Knitr engine render......OK