Cancel pending structure pastes when island is deleted

Pending structures in the active build queue continued to be pasted
after a box was reset or deleted. Drain itemsToBuild on IslandDeleteEvent
to match the existing cleanup of the pending map and persistent DB queue.
Bump version to 3.4.0.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: tastybento

pom.xml

@@ -63,7 +63,7 @@
         <!-- Do not change unless you want different name for local builds. -->
         <build.number>-LOCAL</build.number>
         <!-- This allows to change between versions. -->
-        <build.version>3.3.0</build.version>
+        <build.version>3.4.0</build.version>
 
         <sonar.projectKey>BentoBoxWorld_Boxed</sonar.projectKey>
         <sonar.organization>bentobox-world</sonar.organization>

src/main/java/world/bentobox/boxed/listeners/NewAreaListener.java

@@ -361,6 +361,9 @@ public void onIslandDeleted(IslandDeleteEvent event) {
         // Remove from in-memory cache
         islandStructureCache.remove(deletedIslandId);
 
+        // Remove from active build queue so we don't paste into a deleted island
+        itemsToBuild.removeIf(record -> event.getIsland().inIslandSpace(record.location()));
+
         // Remove from in-memory pending structures
         for (List<StructureRecord> records : pending.values()) {
             records.removeIf(record -> event.getIsland().inIslandSpace(record.location()));