Scene-list screens showed a small spinner while waiting on the API, so a slow
list read felt like a blank stall. Replace the initial-load spinner on
ScenesScreen and TagScenesScreen with a SceneGridSkeleton — a 2-col grid of
pulsing placeholder tiles laid out 1:1 with SceneTile (16:9 thumb + title + meta
lines). It paints instantly with zero data, so the screen feels responsive even
when the query takes a moment, and the skeleton->content swap doesn't reflow.
Pairs with the backend list-count fix (most filtered lists are now ~0.1s); the
skeleton also masks the residual slow path (enormous tags) so it no longer reads
as a freeze.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
