feat: latency indicator, BG queue status, and ToT improvements

- Add latency indicator below minimap (color-coded: green/yellow/orange/red)
  using the lastLatency value measured via CMSG_PING/SMSG_PONG
- Add BG queue status indicator below minimap when in WAIT_QUEUE
  (abbreviated name: AV/WSG/AB/EotS etc.)
- Target-of-Target frame: add level display and click-to-target support
- Expose getLatencyMs() accessor on GameHandler

include/game/game_handler.hpp

@@ -356,6 +356,9 @@ public:
     void declineBattlefield(uint32_t queueSlot = 0xFFFFFFFF);
     const std::array<BgQueueSlot, 3>& getBgQueues() const { return bgQueues_; }
 
+    // Network latency (milliseconds, updated each PONG response)
+    uint32_t getLatencyMs() const { return lastLatency; }
+
     // Logout commands
     void requestLogout();
     void cancelLogout();