Fix preview crash on re-render (BadResource error)

[cderv]

When re-rendering a file during quarto preview in a project, the preview crashes with BadResource: Bad resource ID from the Sass cache Deno.Kv operations.

Root Cause

This is a regression from #13804 which changed how ProjectContext is managed during preview. That PR made the project context persist across re-renders (instead of being recreated each time), but renderForPreview() still called renderResult.context.cleanup() after each render.

The cleanup closes shared resources like the SassCache Deno.Kv handle. On subsequent re-renders, the code returns the cached SassCache instance whose KV handle was already closed, causing the BadResource error when calling kv.get().

Fix

1. Remove the cleanup() call from renderForPreview() - the project context is owned by preview() and should only be cleaned up when preview exits via onCleanup()

2. Invalidate the fileInformationCache entry for the rendered file before each render - since cleanup() previously cleared all caches (including fileInformationCache), removing the call means stale file content would be reused. The cache entry for the specific file being rendered is now deleted so changes are picked up.

Fixes #13955

[posit-snyk-bot]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scanner	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues

💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.

[cderv]

This normalization is related to

• Single file rendering vs Project rendering: inconsistency in input path which is relative vs absolute  #12401

Windows / Linux and Project vs Single file leads to different paths. I tried to make that works because we need to delete by key, so it is important to get the right path, but obviously this modify current behavior, and leads to failed test.

[cderv]

😞 I tried to preview quarto-web with this PR, and I still encounter some issue with sass Kv, we may have an other issue.

[cderv]

Ok so I don't manage to reproduce, maybe it was a bad state. quarto preview on quarto-web works ok to navigate;

However, as expected, change .scss file for example does trigger re-render, but the change are not shown. Though I am really not even sure this working with current 1.8 as discussed.

However, testing quarto render on a single doc, no project fails to udpate.

And I am quite convinced this is because of this normalize path key. So not good to merge yet

• Quarto Project => quarto preview works
• Single file => quarto preview does not show change in output file.

[cderv]

🤦 It is late for me and I spent much time of this, now this should really be non-normalized path for lookup.

I'll test tomorrow manually the behavior