fix: delegate gossip/quest detail getters to QuestHandler (NPC dialog broken)

4 more stale getters from PR #23 split:
- isGossipWindowOpen() — QuestHandler owns gossipWindowOpen_
- getCurrentGossip() — QuestHandler owns currentGossip_
- isQuestDetailsOpen() — QuestHandler owns questDetailsOpen_
- getQuestDetails() — QuestHandler owns currentQuestDetails_

Also fix GameHandler::update() distance-close checks to use delegating
getters instead of stale member variables for vendor/gossip/taxi/trainer.

Map state (currentMapId_, worldStateZoneId_, exploredZones_) confirmed
NOT stale — domain handlers write via owner_. reference to GameHandler's
members. Those getters are correct as-is.

include/game/game_handler.hpp

@@ -1446,21 +1446,10 @@ public:
     // Quest-starting items: right-click triggers quest offer dialog via questgiver protocol
     void offerQuestFromItem(uint64_t itemGuid, uint32_t questId);
     uint64_t getBagItemGuid(int bagIndex, int slotIndex) const;
-    bool isGossipWindowOpen() const { return gossipWindowOpen; }
-    const GossipMessageData& getCurrentGossip() const { return currentGossip; }
-    bool isQuestDetailsOpen() {
-        // Check if delayed opening timer has expired
-        if (questDetailsOpen) return true;
-        if (questDetailsOpenTime != std::chrono::steady_clock::time_point{}) {
-            if (std::chrono::steady_clock::now() >= questDetailsOpenTime) {
-                questDetailsOpen = true;
-                questDetailsOpenTime = std::chrono::steady_clock::time_point{};
-                return true;
-            }
-        }
-        return false;
-    }
-    const QuestDetailsData& getQuestDetails() const { return currentQuestDetails; }
+    bool isGossipWindowOpen() const;
+    const GossipMessageData& getCurrentGossip() const;
+    bool isQuestDetailsOpen();
+    const QuestDetailsData& getQuestDetails() const;
 
     // Gossip POI (aliased from handler_types.hpp)
     using GossipPoi = game::GossipPoi;

src/game/game_handler.cpp

@@ -1467,10 +1467,10 @@ void GameHandler::update(float deltaTime) {
                 LOG_INFO(label, " closed: walked too far from NPC");
             }
         };
-        closeIfTooFar(vendorWindowOpen, currentVendorItems.vendorGuid, [this]{ closeVendor(); }, "Vendor");
-        closeIfTooFar(gossipWindowOpen, currentGossip.npcGuid, [this]{ closeGossip(); }, "Gossip");
-        closeIfTooFar(taxiWindowOpen_, taxiNpcGuid_, [this]{ closeTaxi(); }, "Taxi window");
-        closeIfTooFar(trainerWindowOpen_, currentTrainerList_.trainerGuid, [this]{ closeTrainer(); }, "Trainer");
+        closeIfTooFar(isVendorWindowOpen(), getVendorItems().vendorGuid, [this]{ closeVendor(); }, "Vendor");
+        closeIfTooFar(isGossipWindowOpen(), getCurrentGossip().npcGuid, [this]{ closeGossip(); }, "Gossip");
+        closeIfTooFar(isTaxiWindowOpen(), taxiNpcGuid_, [this]{ closeTaxi(); }, "Taxi window");
+        closeIfTooFar(isTrainerWindowOpen(), getTrainerSpells().trainerGuid, [this]{ closeTrainer(); }, "Trainer");
 
         updateEntityInterpolation(deltaTime);
 
@@ -9973,6 +9973,22 @@ void GameHandler::cancelPetUnlearn() {
 
 // ---- QuestHandler delegating getters ----
 
+bool GameHandler::isGossipWindowOpen() const {
+    return questHandler_ ? questHandler_->isGossipWindowOpen() : gossipWindowOpen;
+}
+const GossipMessageData& GameHandler::getCurrentGossip() const {
+    if (questHandler_) return questHandler_->getCurrentGossip();
+    return currentGossip;
+}
+bool GameHandler::isQuestDetailsOpen() {
+    if (questHandler_) return questHandler_->isQuestDetailsOpen();
+    return questDetailsOpen;
+}
+const QuestDetailsData& GameHandler::getQuestDetails() const {
+    if (questHandler_) return questHandler_->getQuestDetails();
+    return currentQuestDetails;
+}
+
 const std::vector<GossipPoi>& GameHandler::getGossipPois() const {
     if (questHandler_) return questHandler_->getGossipPois();
     static const std::vector<GossipPoi> empty;