fix: silence Dart Sass if() syntax as it's deprecated

Author: thorsten

vite.config.ts

@@ -58,7 +58,7 @@ export default defineConfig({
   css: {
     preprocessorOptions: {
       scss: {
-        silenceDeprecations: ['color-functions', 'global-builtin', 'import'],
+        silenceDeprecations: ['color-functions', 'global-builtin', 'import', 'if-function'],
       },
     },
   },