[x] Toggle Mode UI: Created a toggle mode UI, utilizing the Shatin dropdown menu for theme-switching functionality.
[x] Theme Provider Setup: Installed and configured next-themes, establishing a ThemeProvider within the core/theme directory.
[x] Global Integration: Wrapped the entire app in the theme provider, passing the children prop using the spread prop and added attribute for theme control.
next-themes, establishing aThemeProviderwithin thecore/themedirectory.childrenprop using the spread prop and addedattributefor theme control.Resolves #19