Fix transport sync and stabilize WMO/tunnel grounding

include/rendering/camera_controller.hpp

@@ -165,6 +165,7 @@ private:
 
     // Cached isInsideWMO result (throttled to avoid per-frame cost)
     bool cachedInsideWMO = false;
+    bool cachedInsideInteriorWMO = false;
     int insideWMOCheckCounter = 0;
     glm::vec3 lastInsideWMOCheckPos = glm::vec3(0.0f);
 

include/rendering/m2_renderer.hpp

@@ -430,6 +430,7 @@ private:
     // Animation update buffers (avoid per-frame allocation)
     std::vector<size_t> boneWorkIndices_;        // Reused each frame
     std::vector<std::future<void>> animFutures_; // Reused each frame
+    bool spatialIndexDirty_ = false;
 
     // Smoke particle system
     std::vector<SmokeParticle> smokeParticles;