UI Improvements:
- Add animated toast notification system
- Replace browser alert() with styled toast messages
- Support success, error, and info types
- Auto-dismiss after 4 seconds
- Smooth slide-in animation
- Mobile-responsive positioning (bottom on mobile)
User Experience:
- Success: "Bestellung erfolgreich gesendet! Wir melden uns bei dir."
- Error: "Fehler beim Senden der Bestellung. Bitte versuche es erneut."
- Non-blocking notifications (no modal interruption)
- Modern, polished look matching site design
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
