feat(design): skeleton first loads by shape on the shared reveal clock (E28 S3d2, B8)

frontend/src/components/plexBrowseLists.tsx

@@ -49,7 +49,7 @@ export function PlexPlaylistsBrowse({ onOpen }: { onOpen: (id: number) => void }
       </StateMessage>
     );
   }
-  if (q.isLoading) return <LoadingState label={t("plex.loading")} />;
+  if (q.isLoading) return <LoadingState shape="poster" label={t("plex.loading")} />;
   if (playlists.length === 0)
     return <p className="text-muted text-sm">{t("plex.playlist.none")}</p>;
 
@@ -212,7 +212,7 @@ export function PlexCollectionsBrowse({ onPick }: { onPick: (id: string, title:
           {t("common.loadError")}
         </StateMessage>
       ) : q.isLoading ? (
-        <LoadingState label={t("plex.loading")} />
+        <LoadingState shape="poster" label={t("plex.loading")} />
       ) : collections.length === 0 ? (
         <p className="text-muted text-sm">{t("plex.filter.collectionEmpty")}</p>
       ) : (