Install XQuartz for macOS smoke tests

[Copilot]

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Description

macOS smoke runs were failing in R graphics paths because the CRAN R runtime could not load Cairo/X11 libraries (libXrender.1.dylib). This change installs XQuartz in the reusable smoke-test workflow so macOS jobs have the X11 runtime required for R-rendered figures and tables.

• Scope

  • Update only .github/workflows/test-smokes.yml
  • Leave built-version orchestration unchanged; it continues to consume the reusable smoke workflow

• Workflow change

  • Extend the existing macOS system dependency step to install XQuartz before smoke rendering
  • Keep the existing poppler and librsvg installs in place

• Effect

  • Restores the macOS smoke environment expected by R Cairo/X11 graphics
  • Addresses the failed to load cairo DLL / missing /opt/X11/lib/libXrender.1.dylib failure mode

```yaml
- name: Install missing system deps (macOS)
  if: runner.os == 'macOS'
  run: |
    brew install --cask xquartz
    brew install poppler librsvg
```

Checklist

I have (if applicable):

• referenced the GitHub issue this PR closes
• updated the appropriate changelog in the PR
• ensured the present test suite passes
• added new tests
• created a separate documentation PR in Quarto's website repo and linked it to this PR

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