fix: only show fishing message for player's own bobber, not others'

SMSG_GAMEOBJECT_CUSTOM_ANIM with animId=0 on a fishing node (type 17)
was triggering "A fish is on your line!" for ALL fishing bobbers in
range, including other players'. Now checks OBJECT_FIELD_CREATED_BY
(fields 6-7) matches the local player GUID before showing the message.

src/game/game_handler.cpp

@@ -2195,6 +2195,11 @@ void GameHandler::registerOpcodeHandlers() {
             auto goEnt = entityManager.getEntity(guid);
             if (goEnt && goEnt->getType() == ObjectType::GAMEOBJECT) {
                 auto go = std::static_pointer_cast<GameObject>(goEnt);
+                // Only show fishing message if the bobber belongs to us
+                // OBJECT_FIELD_CREATED_BY is a uint64 at field indices 6-7
+                uint64_t createdBy = static_cast<uint64_t>(go->getField(6))
+                                   | (static_cast<uint64_t>(go->getField(7)) << 32);
+                if (createdBy == playerGuid) {
                     auto* info = getCachedGameObjectInfo(go->getEntry());
                     if (info && info->type == 17) {
                         addUIError("A fish is on your line!");
@@ -2203,6 +2208,7 @@ void GameHandler::registerOpcodeHandlers() {
                     }
                 }
             }
+        }
     };
 
     // Item refund / socket gems / item time