buildPersistedQueueState persisted every non-aborted job's status
as-is. At restart no upload manager exists, so a serialized 'queued'
or 'uploading' job showed up as "Wartet" / "Upload" even though
nothing was actually running — next to a "Bereit" job for the same
file on a different hoster (screenshot the user sent).
Collapse every non-terminal state (queued, getting-server, uploading,
retrying, aborted) to 'preview' during persistence. Terminal states
(done, error, skipped) survive as-is so the user keeps their history
/ error messages. Also clears error/result when collapsing so the
restored preview row doesn't carry stale failure text.
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