Add advanced sync logging for debugging host-client sync issues

- Add LogSync() helper method in Main.cs for consistent sync logging
- Log all packet send/receive events in PacketHandler and Packet classes
- Add detailed building placement logging in WorldPlace.cs (all properties, final state)
- Add building state update logging in BuildingStatePacket.cs
- Add building state send logging in BuildingStateManager.cs

All sync logs are prefixed with [SYNC] for easy filtering.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

StateManagement/BuildingState/BuildingStateManager.cs

@@ -26,7 +26,12 @@ namespace KCM.StateManagement.BuildingState
 
                 Building building = (Building)observer.state;
 
-                //Main.helper.Log("Should send building network update for: " + building.UniqueName);
+                Main.LogSync($"SENDING building state update for: {building.UniqueName} guid={building.guid}");
+                Main.LogSync($"  position={building.transform.position}");
+                if (building.transform.childCount > 0)
+                {
+                    Main.LogSync($"  rotation={building.transform.GetChild(0).rotation} (euler={building.transform.GetChild(0).rotation.eulerAngles})");
+                }
 
                 new BuildingStatePacket()
                 {