Regression: progress message only shows layer download

[ilopezluna]

docker model pull ai/smolvlm
Downloaded: 190.23 MB
Model pulled successfully

However, smolvlm is around 780 MB, so it seems like we’ve regressed to showing only layer progress again.

We’ve had similar issues before with incomplete or inconsistent download progress reporting.
The current progress display logic is too limited, we probably need to rewrite it entirely for proper multi-layer tracking.

Copying Docker-style progress bars could be a good approach.

[ilopezluna]

Fixed in #390