Brand logo should be used for logo in a dashboard

[cwickham]

Bug description

A logo specified in brand won't appear in a dashboard. A reasonable assumption seems to be it would be used for format: dashboard: logo.

Steps to reproduce

---
title: "Untitled"
format: dashboard
brand:
  logo: 
    medium: logo.png
---

Expected behavior

Brand logo should appear in the navbar, e.g. should be the same as:

---
title: "Untitled"
format: 
  dashboard:
    logo: logo.png
---

Actual behavior

Brand logo doesn't appear in navbar.

Your environment

OS: Mac Sequoia 15.0

Quarto check output

$ quarto check
Quarto 99.9.9
[✓] Checking environment information...
      Quarto cache location: /Users/charlottewickham/Library/Caches/quarto
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.4.0: OK
      Dart Sass version 1.70.0: OK
      Deno version 1.46.3: OK
      Typst version 0.11.0: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 99.9.9
      commit: 195974712dbbed32d1f224e42b0014631e534a2b
      Path: /Users/charlottewickham/Documents/posit/quarto-cli/package/dist/bin

[✓] Checking tools....................OK
      TinyTeX: v2024.03.13
      Chromium: (not installed)

[✓] Checking LaTeX....................OK
      Using: TinyTex
      Path: /Users/charlottewickham/Library/TinyTeX/bin/universal-darwin
      Version: 2024

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

[✓] Checking Python 3 installation....OK
      Version: 3.12.1
      Path: /Users/charlottewickham/Documents/posit/quarto-web/.venv/bin/python
      Jupyter: 5.7.2
      Kernels: julia-1.10, ark, python3

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

[✓] Checking R installation...........OK
      Version: 4.3.3
      Path: /Library/Frameworks/R.framework/Versions/4.3-arm64/Resources
      LibPaths:
        - /Users/charlottewickham/Library/R/arm64/4.3/library
        - /Library/Frameworks/R.framework/Versions/4.3-arm64/Resources/library
      knitr: 1.45
      rmarkdown: 2.28

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