feat: charge terrain with acceleration and compact desktop sign staging

src/scene/world/sign.ts

@@ -606,7 +606,7 @@ export function createSign(
       // A wide-screen sign is a real roadside object: fixed lateral offset,
       // fixed mast height, constant size, and travel only along the road axis.
       // Camera movement changes its projection, never its world-space anchor.
-      const desiredPhysical = roadsideSignMetrics(height);
+      const desiredPhysical = roadsideSignMetrics(height, snapshot.targetId);
       for (const key of ['x', 'y', 'scale', 'dwellZ'] as const) {
         physical[key] += (desiredPhysical[key] - physical[key]) * mix;
       }