media-overview-cache
ALWAYS load when working on the Reaparr media overview cache system — includes MediaQueryCache, cache invalidation, warmup, GetAllMediaByTypeEndpoint, library sync/refresh commands that invalidate the cache, the mediaOverviewStore frontend, or the MediaOverview component. Covers the stale-while-revalidate pattern, dirty-mark invalidation, background rebuilds, 503-on-miss behavior, auto-retry, and the key structure.