The Content Explorer remote list already filters out installed ZIMs client-side
(flatData excludes localNames), but the installed-files query has
refetchOnWindowFocus disabled and was never invalidated on download completion.
So when a ZIM finished downloading it dropped off the active-downloads list
(isDownloading -> false) while localFiles stayed stale (isPresent -> false),
letting the just-installed ZIM reappear as a ghost entry until the page remounted.
Add an effect that invalidates the ['zim-files'] query whenever a job drops off
the polled downloads list, so the completed install is picked up and pruned.
Fix originally diagnosed by @johno10661 in #771; reimplemented focused onto
current dev (the accumulated-page/filter groundwork already landed via #731).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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