fix: Dart Sass compatibility + feat: add imagePreview config for home page (#741)

* Dart Sass calc compatibility

* Fix: Default to Dart Sass transpiler + silence deprecations

* Fix: Add imagePreview config toggle — wrap the featured image block

* Implement featured image preview in summary.html

Added featured image preview functionality to summary layout.

* Add imagePreview parameter to home posts configuration

Added option to control featured image preview in home posts.

* Enable image preview in home page post list

layouts/_partials/plugin/style.html

@@ -15,7 +15,7 @@
       {{- $resource = $resource | resources.ExecuteAsTemplate . $.Context -}}
     {{- end -}}
     {{- with .ToCSS -}}
-      {{- $options := . | merge (dict "outputStyle" "compressed") -}}
+      {{- $options := . | merge (dict "outputStyle" "compressed" "transpiler" "dartsass" "silenceDeprecations" (slice "import" "global-builtin" "color-functions" "function-units")) -}}
       {{- $resource = $resource | toCSS $options -}}
     {{- end -}}
     {{- if .Minify -}}
@@ -44,3 +44,4 @@
     <link rel="stylesheet" {{ $attrs | safeHTMLAttr }}>
   {{- end -}}
 {{- end -}}
+