Files
Raj 7358102c68 Fix system df to count content blobs and deduplicate shared storage (#1555)
- Closes #1526 and #1527.

## Type of Change
- [x] Bug fix
- [ ] New feature  
- [ ] Breaking change
- [ ] Documentation update

## Motivation and Context
This PR fixes `system df` to report actual on-disk allocated bytes
(content blobs + snapshots) instead of summing per-image snapshot sizes.
Orphaned blobs are now included as reclaimable, and storage shared
across tags is no longer double counted. Also consolidates three
identical `calculateDirectorySize` implementations into a shared
`FileManager.allocatedSize(of:)` extension.

## Testing
- [x] Tested locally
- [x] Added/updated tests
- [ ] Added/updated docs
2026-06-01 15:44:43 -07:00
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