Fix post-hearthstone asset gaps and add quest tracker interactivity

Hearthstone post-teleport fix:
- Expand same-map hearthstone precache from 5x5 to 9x9 tiles so workers
  have more tiles parsed before the player arrives at the bind point
- After same-map teleport arrival, enqueue the full load-radius tile grid
  (17x17 = 289 tiles) at the new position so background workers immediately
  start loading all WMOs/M2s visible from the new location

Quest tracker improvements:
- Clicking a quest in the tracker now opens the Quest Log (L)
- Remove NoInputs flag so the tracker window receives mouse events
- Show only tracked quests in tracker; fall back to all quests if none tracked
- Add Track/Untrack button in Quest Log details panel
- Abandoning a quest automatically untracks it
- Track state stored in GameHandler::trackedQuestIds_ (per-session)

include/game/game_handler.hpp

@@ -966,6 +966,12 @@ public:
     const std::vector<QuestLogEntry>& getQuestLog() const { return questLog_; }
     void abandonQuest(uint32_t questId);
     bool requestQuestQuery(uint32_t questId, bool force = false);
+    bool isQuestTracked(uint32_t questId) const { return trackedQuestIds_.count(questId) > 0; }
+    void setQuestTracked(uint32_t questId, bool tracked) {
+        if (tracked) trackedQuestIds_.insert(questId);
+        else trackedQuestIds_.erase(questId);
+    }
+    const std::unordered_set<uint32_t>& getTrackedQuestIds() const { return trackedQuestIds_; }
     bool isQuestQueryPending(uint32_t questId) const {
         return pendingQuestQueryIds_.count(questId) > 0;
     }
@@ -1981,6 +1987,7 @@ private:
     // Quest log
     std::vector<QuestLogEntry> questLog_;
     std::unordered_set<uint32_t> pendingQuestQueryIds_;
+    std::unordered_set<uint32_t> trackedQuestIds_;
     bool pendingLoginQuestResync_ = false;
     float pendingLoginQuestResyncTimeout_ = 0.0f;