- Added generateICSContent() function to create RFC-compliant ICS calendar files
- Added /api/events/:slug/calendar.ics endpoint to serve downloadable calendar files
- Updated RSVP confirmation emails to include styled 'Add to Calendar!' button
- ICS files include event title, description, location, date/time, and unique identifiers
- Calendar files are automatically named with event slug for easy identification
- Button links directly to ICS download endpoint for seamless calendar integration
- Supports all major calendar applications (Outlook, Google Calendar, Apple Calendar, etc.)
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