The dashboard background status reconciler (_pollBackgroundStatus) only
recovered "done" for dependency installs when the backend reported a
finished task as "stopped". A real model download whose tmux pane is
gone after DOWNLOAD_OK (so the dead-session check misses the landed
snapshot) fell through to `task.type === 'download' ? 'crashed'`, so a
completed download was shown as crashed (and stalled on the Serve tab).
Recover "done" from the terminal DOWNLOAD_OK sentinel, mirroring the
dep-install recovery already present. The background poll runs blind, so
it keys off the conclusive exit-0 sentinel only — not the `/snapshots/`
path, which can be printed mid-stream for multi-file downloads and would
risk marking an incomplete download done.
Fixes#3897
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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