### Bug description

When trying to use an extension theme for a revealJS presentation that attempts to `@include` additional `.scss` files, quarto throws an error that it can't find the styles to import when trying to compile the scss.

Reproducible example available in [this repo](https://github.com/dgkf/quarto-revealjs-theme-reprex).

In short, using the same extension, using `format: custom-html` works just fine while `format: custom-revealjs` results in an scss compilation error:

```
ERROR: Theme file compilation failed:

Error: Can't find stylesheet to import.
   ╷
46 │ @import "scss/variables";
   │         ^^^^^^^^^^^
   ╵
```

Tested on current development and latest release of `quarto-cli` on an M1 mac.


### Checklist

- [X] Please include a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
- [X] Please [format your issue](https://quarto.org/bug-reports.html#formatting-make-githubs-markdown-work-for-us) so it is easier for us to read the bug report.
- [X] Please document the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
- [X] Please document the operating system you're running. If on Linux, please provide the specific distribution.
dragonstyle
2022-11-21T19:31:01Z
dgkf
bug
v1.3
closed
Extension themes with @import scss rule fail to compile for revealJS 
https://github.com/quarto-dev/quarto-cli/issues/3414