Refactor instance loading: extract initializeRenderers, fix deferred state transition

- Extract initializeRenderers() from loadTestTerrain() so WMO-only maps
  (dungeons/raids) initialize renderers directly without a dummy ADT path
- Defer setState(IN_GAME) until after processing any pending deferred world
  entry, preventing brief IN_GAME flicker on the wrong map
- Remove verbose area trigger debug logging (every-second position spam)

include/rendering/renderer.hpp

@@ -71,6 +71,12 @@ public:
      */
     bool loadTestTerrain(pipeline::AssetManager* assetManager, const std::string& adtPath);
 
+    /**
+     * Initialize all sub-renderers (WMO, M2, Character, terrain, water, minimap, etc.)
+     * without loading any ADT tile.  Used by WMO-only maps (dungeons/raids/BGs).
+     */
+    bool initializeRenderers(pipeline::AssetManager* assetManager, const std::string& mapName);
+
     /**
      * Enable/disable terrain rendering
      */