Fix camera snapping to floors above player in WMO buildings

Removed +3.0f offset from camera WMO floor query. The offset combined
with the +2.0f allowAbove in getFloorHeight was detecting floors 5 units
above camera, causing snaps to upper stories. Camera now queries at its
actual Z position to only detect reachable floors.

src/rendering/camera_controller.cpp

@@ -665,7 +665,7 @@ void CameraController::update(float deltaTime) {
                     camWmoH = cachedCamWmoFloor;
                 } else {
                     camWmoH = wmoRenderer->getFloorHeight(
-                        smoothedCamPos.x, smoothedCamPos.y, smoothedCamPos.z + 3.0f);
+                        smoothedCamPos.x, smoothedCamPos.y, smoothedCamPos.z);
                     cachedCamWmoFloor = camWmoH;
                     hasCachedCamFloor = true;
                     lastCamFloorQueryPos = smoothedCamPos;