* BREAKING CHANGE: refactor with Dart Sass (supplement to #741)
* chore: update .gitignore to include .vercel and .env*.local
* CI: add build script for Hugo site deployment on Vercel
* CI: update build script for Hugo site deployment on Vercel
* refactor: update SCSS layout styles and introduce page-style mixin
* refactor: reorganize SCSS files and improve layout structure
* refactor: rename copy button classes and update related styles
* 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