Migrate Deprecated Sass Unquote to String.unquote for Dart Compatibility

[wesdevpro]

@jgthms this is a bugfix.

Proposed solution

Replaces the deprecated global built-in unquote() function with string.unquote() to align with Dart Sass 3.0 requirements. This change affects the getRgbaVar() function in utilities/css-variables.scss, which supports Bulma’s CSS variable parsing.

Tradeoffs

• Minimal impact to CSS output, but this assumes use of a modern Dart Sass environment.
• Older Sass versions may not support namespaced functions, so contributors on legacy tooling should be aware.
• Avoids future build warnings while preserving clarity for maintainers.

Testing Done

None.

Function usage has been validated in Dart Sass and complies with modern syntax guidelines.

Changelog updated?

Yes!

Related: buefy/buefy#4093

[mateuswetah]

@jgthms I'm facing warnings related to this as well. I'm not sure if there is any way to use dart-sass and not receive the warning but It would be nice to have this bug fix in a future release.

Module Warning (from ./node_modules/sass-loader/dist/cjs.js):
Deprecation Warning on line 33, column 10 of file:///src/tainacan/node_modules/bulma/sass/utilities/css-variables.scss:33:10:
Global built-in functions are deprecated and will be removed in Dart Sass 3.0.0.
Use string.unquote instead.

More info and automated migrator: https://sass-lang.com/d/import

33 |   @return unquote("rgba(var(#{$varName}), #{$alpha})");


node_modules/bulma/sass/utilities/css-variables.scss 34:11       getRgbaVar()
node_modules/buefy/src/scss/components/_datepicker.scss 11:37    @use
src/views/page.main.scss 15:5                                    root stylesheet

[wesdevpro]

@jgthms I'm facing warnings related to this as well. I'm not sure if there is any way to use dart-sass and not receive the warning but It would be nice to have this bug fix in a future release.

Module Warning (from ./node_modules/sass-loader/dist/cjs.js):
Deprecation Warning on line 33, column 10 of file:///src/tainacan/node_modules/bulma/sass/utilities/css-variables.scss:33:10:
Global built-in functions are deprecated and will be removed in Dart Sass 3.0.0.
Use string.unquote instead.

More info and automated migrator: https://sass-lang.com/d/import

33 |   @return unquote("rgba(var(#{$varName}), #{$alpha})");


node_modules/bulma/sass/utilities/css-variables.scss 34:11       getRgbaVar()
node_modules/buefy/src/scss/components/_datepicker.scss 11:37    @use
src/views/page.main.scss 15:5                                    root stylesheet

@mateuswetah @jgthms I also receive these warning when building Buefy and I believe this PR should fix the issue.

[wesdevpro]