When file or folder rename/move operations failed in WebDAV handlers,
all errors were incorrectly converted to HTTP 500 Internal Server Error
using AppError::internal_error(). This masked specific error types:
- AlreadyExists errors should return 409 CONFLICT
- NotFound errors should return 404 NOT FOUND
- AccessDenied errors should return 403 FORBIDDEN
Changed error handling to use AppError::from() which preserves the
original DomainError type and maps to appropriate HTTP status codes.
Fixes handling of incorrect status code for file rename failure.
BillionClaw
3c48aa1e6f