Embed is broken by period or underscore in the prefix of reference notebook

Bug description

In trying to embed a hidden notebook, I encountered an issue with the text parsing of the uri which leads to a NotFound Error due to the / being removed.

Using this reference: {{< embed ../../_cross_test.ipynb >}} led to:

PS C:\Users\dmley\OneDrive\Desktop\Sites\dmitriyleybel.github.io> quarto render
[1/5] about.qmd
[2/5] blog.qmd
[3/5] index.qmd
[4/5] posts\test_poast2\index.ipynb
ERROR: Rendering of output notebook produced an unexpected result
ERROR: NotFound: The system cannot find the file specified. (os error 2): readfile 'C:\Users\dmley\OneDrive\Desktop\Sites\dmitriyleybel.github.io_cross_test.ipynb'
Path: C:\Users\dmley\OneDrive\Desktop\Sites\dmitriyleybel.github.io_cross_test.ipynb

Stack trace:
Path: C:\Users\dmley\OneDrive\Desktop\Sites\dmitriyleybel.github.io_cross_test.ipynb
    at readTextFileSync (ext:deno_fs/30_fs.js:733:14)
    at Object.Deno.readTextFileSync (file:///C:/Program%20Files/Quarto/bin/quarto.js:5625:25)
    at Object.target (file:///C:/Program%20Files/Quarto/bin/quarto.js:38268:37)
    at fileExecutionEngineAndTarget (file:///C:/Program%20Files/Quarto/bin/quarto.js:41263:33)
    at renderFileInternal (file:///C:/Program%20Files/Quarto/bin/quarto.js:77120:42)
    at eventLoopTick (ext:core/01_core.js:183:11)
    at async renderFile (file:///C:/Program%20Files/Quarto/bin/quarto.js:77095:13)
    at async Object.renderOutputNotebook [as render] (file:///C:/Program%20Files/Quarto/bin/quarto.js:81477:22)
    at async Object.render (file:///C:/Program%20Files/Quarto/bin/quarto.js:81748:34)
    at async Object.renderPreviews (file:///C:/Program%20Files/Quarto/bin/quarto.js:109695:47)

Steps to reproduce

1. Create a source notebook with either a _ or . prefix. e.g. _ref.ipynb, and let it live in a folder a directory or two away from the notebook you wish to render.
2. Create a notebook to render(e.g. index.ipynb, and as one of the cells in the notebook, create a reference {{< embed ../../_ref.ipynb >}} to the source.
3. Run quarto render Observe error

Expected behavior

No response

Actual behavior

No response

Your environment

• IDE: VS Code 1.86.2
• OS: Win11
• Quarto: 1.4.551

Quarto check output

Quarto 1.4.551
[>] Checking versions of quarto binary dependencies...
      Pandoc version 3.1.11: OK
      Dart Sass version 1.69.5: OK
      Deno version 1.37.2: OK
[>] Checking versions of quarto dependencies......OK
[>] Checking Quarto installation......OK
      Version: 1.4.551
      Path: C:\Program Files\Quarto\bin
      CodePage: 1252

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

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

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

[>] Checking Python 3 installation....OK
      Version: 3.11.3
      Path: C:/Users/dmley/AppData/Local/Programs/Python/Python311/python.exe
      Jupyter: 5.7.2
      Kernels: python3

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

[>] Checking R installation...........(None)

      Unable to locate an installed version of R.
      Install R from https://cloud.r-project.org/