chore: update dependencies and component styling

- Upgrade Rollup to version 4.34.8
- Update TypeScript ESLint and related packages
- Modify LanguageSwitcher and ThemeToggle components to remove `lg="hidden"` class
- Refactor Scrollbar component with improved initialization and theme handling
- Inline scrollbar styles in Scrollbar component, removing separate CSS file

src/layouts/Head.astro

@@ -111,6 +111,7 @@ function updateTheme() {
   if (metaTheme) {
     metaTheme.setAttribute('content', isDark ? darkMode : lightMode)
   }
+  document.dispatchEvent(new Event('theme-changed'))
 }
 
 // Listen to system theme changes in real-time