f9c87369e5
Add full end-to-end calendar creation feature including: - Create Calendar button in sidebar footer - Modal form with name, description, and color picker (16 predefined colors in 4x4 grid) - Form validation and error handling with loading states - Backend API endpoint for calendar creation with authentication - CalDAV MKCALENDAR protocol implementation with proper XML generation - Real-time calendar list refresh after successful creation - Responsive design for mobile and desktop 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>