Expand destination preview snapshots

README.md

@@ -25,7 +25,7 @@ right-clicking with an empty hand. Sneak-right-click with an empty hand to take
 the book back and restore the vanilla lectern. Breaking a Book Stand drops both
 the stored book and a vanilla lectern.
 
-Bound Linking Books request a server-validated 18-by-18-by-18 snapshot around
+Bound Linking Books request a server-validated 32-by-32-by-32 snapshot around
 their destination. The book keeps its target-centered close-up framing as a
 rotating Ponder scene on the left page, backed by the
 destination biome's sky color. The snapshot is visual only; the server