* 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
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