* refactor: add standardized spacing variables and more style cleanup
* refactor: rename `spacing-xxl` to `spacing-2xl` and introduce `spacing-3xl` for consistent spacing variables.
* refactor: Migrate related content styling to use the `subsection-list` component with updated layout adjustments.
* style: adjust padding values for article list tiles.
* refactor: Introduce shadow variables and dynamic spacing to prevent shadow cutoff in list layouts.
* refactor: relocate dark scheme Mermaid variables within the root scope.
* refactor(i18n): simplify the structure of the translation file
* chore: prepare repository for v4.0.0-alpha
* chore: modify go.mod to v4
* refactor: migrate theme configuration to TOML
* fix: exampleSite not using correct theme
* feat: add favicon from assets folder
* refactor: drop linear grandient background feature
remove node-vibrant from dependencies
* feat: use Hugo's code block render hook to implement code copy button
Now it can have i18n support
* refactor: delete color.ts
* refactor: delete Emoji support post from example site
* refactor: drop support for `hidden` field in front matter
* feat: upgrade to PhotoSwipe v5
* chore: bump the required hugo version to 0.100.0
* refactor: remove PhotoSwipe from external.yaml
* fix: extra margin in search result
* fix: incorrect markdown heading level in example site
* refactor: remove some usages of `default` in template
No longer needed thanks to Hugo's configuration merge
* fix: one line codeblock style in firefox
closes https://github.com/CaiJimmy/hugo-theme-stack/issues/564
* feat: add style to new codeblock
* feat: i18n support for codeblock copy text
* fix(menu): jitter when closing menu
It's caused by flexbox gap property, which can't animate
* fix(search): long text overflows under the Search icon
closes https://github.com/CaiJimmy/hugo-theme-stack/issues/515
* add LanguageDirection variable
* add .direction-rtl and .direction-ltr clases
* margin -right > margin-inline-end
* keep Codeblocks LTR
* switch to logical properties
* left -> inset-inline-start
* Add Arabic/RTL placeholder text
* Add arabic language
* remove space
* use Html Dir instead of class
* Move codeblock code to layout/article.css and fix 4 spaces codeblocks
* remove unused clases
