- The honest-state branch now guards on `isError && !data`, so a background/window-focus refetch
failure keeps already-visible content instead of replacing the list with a full error screen
(regression the bare `isError` introduced). Applied to AuditLog, Channels, ChannelDiscovery,
PlexBrowse, PlexPlaylistView, Messages(people), Feed — matching the guard already used in
Messages(conversations)/NotificationsPanel/Scheduler.
- Drop the unused DataTable loading/error/onRetry props (every table page uses the outer
StateMessage branch, not the props) — reverts DataTable to its simple empty block.
- StateMessage announces errors with role=alert/aria-live=assertive (was polite for all tones).
- Remove the now-unused common.empty string (en+hu), left over from the removed QueryState render-prop.