Handle gossip POI, combat clearing, dismount, spell log miss, and loot notifications

- SMSG_GOSSIP_POI: parse map POI markers (x/y/icon/name) from quest NPCs, render as
  cyan diamonds on the minimap with hover tooltips for quest navigation
- SMSG_ATTACKSWING_DEADTARGET: clear auto-attack when target dies mid-swing
- SMSG_CANCEL_COMBAT: server-side combat reset (clears autoAttacking + target)
- SMSG_BREAK_TARGET / SMSG_CLEAR_TARGET: server-side targeting clears
- SMSG_DISMOUNT: server-forced dismount triggers mountCallback(0)
- SMSG_MOUNTRESULT / SMSG_DISMOUNTRESULT: mount feedback in system chat
- SMSG_LOOT_ALL_PASSED: "Everyone passed on [Item]" system message, clears loot roll
- SMSG_LOOT_ITEM_NOTIFY / SMSG_LOOT_SLOT_CHANGED: consumed
- SMSG_SPELLLOGMISS: decode miss/dodge/parry/block from spell casts into combat text
- SMSG_ENVIRONMENTALDAMAGELOG: environmental damage (drowning/lava/fall) in combat text
- GossipPoi struct + gossipPois_ vector in GameHandler with public getters/clearers

include/game/game_handler.hpp

@@ -825,6 +825,17 @@ public:
     bool isQuestDetailsOpen() const { return questDetailsOpen; }
     const QuestDetailsData& getQuestDetails() const { return currentQuestDetails; }
 
+    // Gossip / quest map POI markers (SMSG_GOSSIP_POI)
+    struct GossipPoi {
+        float    x     = 0.0f;   // WoW canonical X (north)
+        float    y     = 0.0f;   // WoW canonical Y (west)
+        uint32_t icon  = 0;      // POI icon type
+        uint32_t data  = 0;
+        std::string name;
+    };
+    const std::vector<GossipPoi>& getGossipPois() const { return gossipPois_; }
+    void clearGossipPois() { gossipPois_.clear(); }
+
     // Quest turn-in
     bool isQuestRequestItemsOpen() const { return questRequestItemsOpen_; }
     const QuestRequestItemsData& getQuestRequestItems() const { return currentQuestRequestItems_; }
@@ -1778,6 +1789,7 @@ private:
     // Gossip
     bool gossipWindowOpen = false;
     GossipMessageData currentGossip;
+    std::vector<GossipPoi> gossipPois_;
 
     void performGameObjectInteractionNow(uint64_t guid);