acc5ced551
- Fix double timezone conversion in drag-and-drop that caused 4-hour time shifts - Frontend now sends local times instead of UTC to backend for proper conversion - Add missing timezone parameter to update_series method to fix recurring event updates - Update both event modal and drag-and-drop paths to include timezone information - Maintain RFC 5545 compliance with proper timezone conversion in backend 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>