- Replace react-world-flags with next/image for better optimization
- Simplify locale handling logic and remove unused getUserLocale
- Rename component to be more descriptive (language-settings -> locale-switcher)
- Update all references to use the new component
- Add proper SVG flag assets for supported locales
- Remove react-world-flags dependency from package.json
- Replace hardcoded locale strings with generated Locale enum from client
- Update cookie key name to be more specific (LOCALE_COOKIE_NAME -> JUDGE4C_LOCALE_KEY)
- Rename defaultLocale to DEFAULT_LOCALE for consistency
- Add 'server-only' imports to ensure server-side usage
- Simplify locale validation using Object.values(Locale)
- Clean up accept-language header parsing logic
