- AppUpdateItem now shows a disabled "Installing" button while the
download is COMPLETED and awaiting install, instead of briefly
reverting to "Update" between download-done and InstallerEvent.Installed.
- Section header replaces all-or-nothing "Update all" toggle with an
any-active check, so "Cancel all" appears as soon as a single update
is in flight. Same treatment for the ownership-approval section.
- Empty placeholder no longer hides the ignored-updates list when there
are no live updates.
- DownloadHelper.cancelAll also flips COMPLETED -> CANCELLED so the
Cancel-all button gives immediate feedback for pending-install rows.
- DownloadListItem: surface the failed icon for FAILED downloads too.
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