[dylanjeffers]

On a cold start, mobile Trending painted the saved snapshot from disk, which can be up to 24 hours old, then refetched and swapped in the current order. Every tile then remounted because lineup keys included the row index, so the list looked like it reloaded into a different UI.

Changes

• TrendingLineup: if the restored snapshot was already stale when the session started (older than the 5-minute staleTime), show skeletons until the mount refetch lands. If that refetch fails, the snapshot is shown. A snapshot that is still fresh paints right away as before. Refetches later in the session (window focus, etc.) never hold, because their data is newer than the session start.
• useTrending: also returns isRefetching and dataUpdatedAt.
• TrackLineup: tile keys are track-<id> / collection-<id> (with a suffix if an entity repeats) instead of including the index, so a reorder moves tiles instead of rebuilding them.
• TrackLineup: trailing skeletons show only for a load-more the list triggered, not for any background refetch. An empty list that is fetching still shows the initial skeletons.

Testing

• Ran @tanstack/query-core directly against a hydrated snapshot, with the same _optimisticResults: 'optimistic' that useBaseQuery sets:
  • 2h-old snapshot: the hold is on from the first render and releases when fresh data lands.
  • 1-min-old snapshot: never holds.
  • fetchNextPage: never holds.
• eslint is clean on the three files, and tsc reports no errors in them. Other tsc errors in the worktree come from node_modules cloned from an older checkout.
• Not run on a device or simulator.

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