- upgrade word scrambler with modern UI and expanded functionality

- implement dark mode with theme toggle and localStorage persistence
- add advanced scrambling options (preserve spaces, case, punctuation)
- introduce word-level scrambling option as alternative to character-level
- add character counter, copy to clipboard, and toast notifications
- improve mobile responsiveness with grid layout for small screens
- refactor JavaScript with modern event listeners and cleaner functions
- update dependencies to Bootstrap 5.2.3 and Font Awesome 6.2.1

Author: TobiasMue91