Events dragged to 4am-7am were appearing at 8am-11am due to double
timezone conversion. The issue was:
1. Frontend converted local time to UTC before sending to backend
2. Backend (after previous fix) converted "local time" (actually UTC) to UTC again
3. Result: double conversion causing 4+ hour shift in wrong direction
Solution: Remove frontend UTC conversion in drag-and-drop callback.
Let backend handle the local-to-UTC conversion consistently.
- Remove .and_local_timezone(chrono::Local).unwrap().to_utc() conversion
- Send NaiveDateTime directly as local time strings to backend
- Backend parse_event_datetime() now properly handles local-to-UTC conversion
Now drag-and-drop works correctly: drag to 4am shows 4am.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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