Expand and color destination previews

docs/PORTING.md

@@ -114,6 +114,10 @@ Version 0.1.13 requests a bounded, server-validated 9-by-7-by-9 block snapshot
 from the held book or nearby Book Stand and renders it as a clipped, rotating
 Ponder world section on the Linking Book's left page.
 
+Version 0.1.14 expands the destination snapshot to 9-by-7-by-17 blocks along
+the Z axis, rescales the rotating scene to expose that depth, and colors the
+panel background with the destination biome's sky color.
+
 The preview code is separated behind a renderer interface and uses an isolated
 Ponder level. The first iteration supplies the animated loading boundary; the
 next iteration will add server-authoritative snapshot transport and populate