Add book GUI and Ponder preview foundation

README.md

@@ -12,11 +12,13 @@ been ported yet.
 
 ## Linking Book
 
-Craft a Linking Book from a vanilla book and an ender pearl. Sneak-right-click
-the unbound book to record the current location, then right-click it to return
-there. The destination is stored on the item and survives inventory and world
-saves. Travel only succeeds if the target dimension is loaded and a solid,
-collision-free landing position can be found nearby.
+Craft a Linking Book from a vanilla book and an ender pearl, then use it in the
+air. An unbound book opens a screen where it can be named and bound to the
+current location. A bound book opens its destination screen and travels only
+when the Link button is pressed. The destination is stored on the item and
+survives inventory and world saves. Travel only succeeds if the target
+dimension is loaded and a solid, collision-free landing position can be found
+nearby.
 
 Right-click an empty vanilla lectern with a Rivencraft book to convert it into
 a Book Stand and place the book on it. Use a Linking Book on the stand by
@@ -24,11 +26,16 @@ 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.
 
+Version 0.1.4 establishes a Ponder-backed destination-preview boundary and an
+animated loading view. Transmitting a destination snapshot and rendering its
+actual blocks as the rotating scene is the next preview iteration.
+
 ## Requirements
 
 - A Java 21 JDK
 - Minecraft 1.21.1
 - NeoForge 21.1.251 or newer in the 21.1 line
+- Ponder 1.0.82 for Minecraft 1.21.1 (client)
 
 ## Build and run