UAT follow-ups on the Plex filter epic:
- Sort now has an asc/desc toggle (sort_dir), applied to any sort field.
- Genre multi-select gains an Any/All mode (genre_mode: OR vs AND containment).
- Director/actor/studio become multi-value: people AND (titles featuring all selected),
studios OR; clicking them on the info page stacks (unions) instead of replacing, and
the sidebar shows each as a removable 'Active' chip.
- fix(history): clicking a metadata filter on the info page now pushes a fresh grid
entry instead of history.back(), so browser Back returns to the info page rather than
leaving the Plex module.
- fix(player): fully tear down the <video> + hls on unmount and guard late play() calls,
so backing out of a just-started video no longer leaves audio playing in the background.
i18n en/hu/de (match any/all, sort direction).
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