Disable structural sharing and simplify query updates

Turn off React Query's structural sharing for now-playings so new arrays
are treated as changes. Also pass values directly to setQueryData for
now-playings and scrobblesChart instead of updater functions.

apps/web/src/hooks/useNowPlaying.tsx

···
         { params: { size: 47 } },
       ),
     select: (res) => res.data.nowPlayings || [],
+    structuralSharing: false,
   });

apps/web/src/pages/home/feed/Feed.tsx

···
       }
 
       const message = JSON.parse(event.data);
-      queryClient.setQueryData(["now-playings"], () => [
-        ...message.nowPlayings,
-      ]);
-      queryClient.setQueryData(
-        ["scrobblesChart"],
-        () => message.scrobblesChart,
-      );
+      queryClient.setQueryData(["now-playings"], [...message.nowPlayings]);
+      queryClient.setQueryData(["scrobblesChart"], message.scrobblesChart);
 
       await queryClient.invalidateQueries({
         queryKey: ["infiniteFeed", feedUri],