* Fix EXT-553: Remove percentage-based progress tracking for worktree file copying
- Removed totalBytes from CopyProgress interface
- Removed Math.min() clamping that caused stuck-at-100% issue
- Changed UI from progress bar to spinner with activity indicator
- Shows 'item — X MB copied' instead of percentage
- Updated all 18 locale files
- Uses native cp with polling (no new dependencies)
* fix: translate copyingProgress text in all 17 non-English locale files
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Co-authored-by: Roo Code <roomote@roocode.com>