Topic and language chips now show live channel counts for the current filter
context instead of the static global count, and chips that match nothing are
hidden (selected chips stay so they can be cleared). Selecting a channel (or any
filter) drops the now-irrelevant chips and updates the rest. Extract a shared
filterParams() so the feed and facets queries see identical filters; the facets
query is keyed on filters so it refetches as they change. Trilingual empty-state
string when a category has no matching tags.
The backend shuffle sort already accepts a seed param. Add a circular
reshuffle button next to the sort control (shown only when shuffle is
active) that re-rolls the seed and re-queries the feed; selecting shuffle
also seeds a fresh order instead of the deterministic seed-0 one. The seed
lives in FeedFilters but is intentionally kept out of the URL state.
Feed, VideoCard, Sidebar, PlayerModal, Channels, Stats, SettingsPanel,
OnboardingWizard, NotificationCenter, Toaster, ErrorBoundary and the relativeTime
helper are now fully translated in Hungarian, English and German, each with its own
locale area file (auto-loaded). Key parity verified across all three languages.
