Fix WMO wall collision, normal mapping, POM backfill, and M2/WMO rendering performance

- Fix MOPY flag check (0x08 not 0x01) for proper wall collision detection
- Cap MAX_PUSH to PLAYER_RADIUS to prevent gradual clip-through
- Fix WMO doodad quaternion component ordering (X/Y swap)
- Linear normal map strength blend in shader for smooth slider control
- Enable shadow sampling for interior WMO groups (covered outdoor areas)
- Backfill deferred normal/height maps after streaming with descriptor rebind
- M2: prepareRender only iterates animated instances, bone dirty flag
- M2: remove worker thread VMA allocation, skip unready bone instances
- WMO: persistent visibility vectors, sequential culling
- Add FSR EASU/RCAS shaders

include/core/application.hpp

@@ -236,6 +236,11 @@ private:
     std::optional<PendingWorldEntry> pendingWorldEntry_;  // Deferred world entry during loading
     float taxiLandingClampTimer_ = 0.0f;
     float worldEntryMovementGraceTimer_ = 0.0f;
+
+    // Hearth teleport: freeze player until terrain loads at destination
+    bool hearthTeleportPending_ = false;
+    glm::vec3 hearthTeleportPos_{0.0f};  // render coords
+    float hearthTeleportTimer_ = 0.0f;   // timeout safety
     float facingSendCooldown_ = 0.0f;        // Rate-limits MSG_MOVE_SET_FACING
     float lastSentCanonicalYaw_ = 1000.0f;   // Sentinel — triggers first send
     float taxiStreamCooldown_ = 0.0f;