Fix quest item loot parsing and quest item progress tracking

- add SMSG_QUESTUPDATE_ADD_ITEM logical opcode mapping (0x197)
- handle quest item progress updates in GameHandler
- parse quest-item section in SMSG_LOOT_RESPONSE (regular + quest items)
- add quest item progress storage in quest log entries
- show tracked kill/item progress in Quest Log UI

include/game/game_handler.hpp

@@ -702,6 +702,8 @@ public:
         bool complete = false;
         // Objective kill counts: objectiveIndex -> (current, required)
         std::unordered_map<uint32_t, std::pair<uint32_t, uint32_t>> killCounts;
+        // Quest item progress: itemId -> current count
+        std::unordered_map<uint32_t, uint32_t> itemCounts;
     };
     const std::vector<QuestLogEntry>& getQuestLog() const { return questLog_; }
     void abandonQuest(uint32_t questId);