Supplementary repair runs over downloads whose video is already complete, so
it no longer emits a downloading transition, and artwork updates carry the
row's real status instead of asserting downloading. Previously a reconnect
left completed downloads stuck at "downloading 0%" until the next DB read.
Storage exhaustion fails every active row in one transaction, so
failActiveDownloadsForStorageFull now returns the affected keys and each one
gets a failed event; only the triggering key was announced before.
The post-recovery database open also closes its handle before rethrowing. A
failing storage-full write abandoned a drift background isolate and its
SQLite handles on every retry.
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