Convert yaw/pitch in sync_entity_position handler (#3896)

The 1.21.3+ sync_entity_position packet replaced separate look/move
packets but the new handler set entity.yaw/pitch directly from packet
fields, skipping the notchian → radians conversion the older handlers
in this file apply via fromNotchianYaw/fromNotchianYawByte.

Tracked entities (other players, mobs) ended up with raw protocol
values in their public yaw/pitch fields, so consumers like
prismarine-viewer interpreting them as radians produced wildly wrong
rotations on every move event. The bug was masked when entities also
emitted entity_look packets (which set yaw correctly via the byte
helper), so it was visible mainly during y-only motion (jumping)
where no look packet fires.

Co-authored-by: domdomegg <domdomegg+anthropic@gmail.com>

Author: domdomegg

lib/plugins/entities.js

@@ -349,8 +349,8 @@ function inject (bot) {
     const entity = fetchEntity(packet.entityId)
     entity.position.set(packet.x, packet.y, packet.z)
     entity.velocity.set(packet.dx, packet.dy, packet.dz)
-    entity.yaw = packet.yaw
-    entity.pitch = packet.pitch
+    entity.yaw = conv.fromNotchianYaw(packet.yaw)
+    entity.pitch = conv.fromNotchianPitch(packet.pitch)
     bot.emit('entityMoved', entity)
   })