Keep world sharp behind linking books

docs/PORTING.md

@@ -89,6 +89,10 @@ legacy interface. The destination preview occupies the left page, the book name
 and destination details occupy the right page, and the preview itself is the
 link action; the separate Link and Done buttons have been removed.
 
+Version 0.1.7 suppresses Minecraft's default full-screen menu blur for the
+Linking Book screen. The open-book texture supplies the GUI background while
+the world remains sharp behind it.
+
 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