- Parallel file uploads with --parallel flag (default 4)
- indicatif MultiProgress: overall bar with file count, speed, ETA
- Per-file spinner bars showing filename during upload
- Phase 1: walk tree + create folders sequentially
- Phase 2: upload files concurrently via semaphore
- Summary line on completion (files, bytes, time, speed)
- Fixed DriveFile/DriveFolder types to match actual API fields
- DriveClient now Clone for Arc sharing across tasks