* refactor(styles): unify theme properties and update color variables across stylesheets
* Implement theme mode support with light-dark color adjustments across stylesheets
- Added color-scheme support in _root.scss for light and dark modes.
- Replaced theme property mixins with light-dark function in various widget styles including _cell-tooltip.scss, _cookieconsent.scss, _fixed-button.scss, and others.
- Updated alert styles in _alert.scss to use light-dark for border and text colors.
- Refactored code syntax highlighting in _code.scss and _code-syntax/_index.scss to utilize light-dark for background gradients.
- Enhanced search input styles in _search.scss to adapt to theme mode.
- Modified theme switching logic in color-scheme.js and theme.js to support new theme mode structure.
- Adjusted APlayer and Valine styles to accommodate dark mode using new theme variables.
* feat(shortcode): add auto-dark shortcode for dark mode adaptation
* refactor(styles): update theme colors and improve box-shadow properties for better visual consistency
* feat(header): add scroll-state container queries and enhance header shadow effects
* feat(styles): enhance scroll behavior with overscroll-behavior adjustments for better UX
* feat(styles): update code&table styles and colors for improved visual consistency
* feat(styles): update color variables and improve font styling for better visual hierarchy
* refactor: CSS variables to use fixit-var for consistency across styles
* refactor: reorganize CSS structure and consolidate imports for improved maintainability
* refactor: unify CSS variable usage and improve structure across stylesheets
* refactor: standardize CSS variable usage for layout
* refactor: standardize CSS variable usage for archive and special pages
* refactor: standardize CSS variable usage for single page
* refactor: standardize CSS variable usage for widgets
* refactor(css): refactors the border-radius mixin and adds the .rounded-full utility class
* refactor: standardize z-index usage across components
* refactor(css): removes deprecated compatibility mixins and replaces them with native CSS properties
* feat: unify color variable naming and update theme color values
- Rename `global-font-secondary-color` to `global-placeholder-color` for more accurate description of its purpose
- Update multiple style references to use the new `secondary` theme color variable
- Update theme color mapping to the new color values for improved visual consistency
- Fixed the use of search box placeholder colors and removed hard-coded transparency values
- Added color preview test documentation for easier verification of color rendering
- Cleaned up some duplicate dark mode styles and replaced them with unified CSS variables
* refactor: remove the `hr-background-color` variable and uses `global-border-color` uniformly
* feat(CSE): add dark theme style to Google CSE search box and results container
* fix(task-lists): fixed styling and rendering issues with nested task lists
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