[Bug]: `container system df` omits image content blobs from image size and reclaimable bytes

[realrajaryan]

I have done the following

• I have searched the existing issues
• If possible, I've reproduced the issue using the 'main' branch of this project

Steps to reproduce

Use a clean app root, pull a single-platform image, then compare system df with the image content store:

$ container image pull --platform linux/arm64 --progress plain alpine:latest
[1/2] Fetching image [0s]
[1/2] Fetching image [1s]
[1/2] Fetching image 53% (3 of 4 blobs, 2.2/4.0 MB, 8 KB/s) [2s]
[2/2] Unpacking image [2s]
[2/2] Unpacking image for platform linux/arm64/v8 [2s]
[2/2] Unpacking image for platform linux/arm64/v8 100% (514 entries, 8.3 MB) [2s]

$ container system df --format json
{
  "containers" : {
    "active" : 0,
    "reclaimable" : 0,
    "sizeInBytes" : 0,
    "total" : 0
  },
  "images" : {
    "active" : 0,
    "reclaimable" : 78729216,
    "sizeInBytes" : 78729216,
    "total" : 1
  },
  "volumes" : {
    "active" : 0,
    "reclaimable" : 0,
    "sizeInBytes" : 0,
    "total" : 0
  }
}

$ du -sk "/Users/ras/Downloads/test_container/audit_artifacts/container-issue-repros-20260511-101939/app-root/content/blobs/sha256"
4124    /Users/ras/Downloads/test_container/audit_artifacts/container-issue-repros-20260511-101939/app-root/content/blobs/sha256

Problem description

system df reports image size and reclaimable bytes without counting image content blobs. Those blobs are image-managed storage and are reclaimed during image cleanup. system df should include blob storage in image size/reclaimable bytes, or explicitly label the current value as unpacked snapshot storage only.

Environment

- OS: macOS 26.4.1 (25E253)
- Xcode: Xcode 26.4.1 (17E202)
- Container: container CLI 0.12.3 (build: release, commit: f989901)

Code of Conduct

• I agree to follow this project's Code of Conduct