fix: the camera looks at the ramped city, not at a point in the air above it

The relief ramp scales the ground group to 5.78/15 when you are in a
city, so Twin Peaks is not 4 km tall at FiDi. Camera targets lived in
world space and were still written from baked 15x groundAt, so the
look-at hung 2.6x above downtown and every tower read as a needle.

chapterPose, the aircraft, and seek now use the scaled surface.
When the ramp moves, camera and look-at Y scale with it from sea
level so height-above-surface stays authored.

src/main.ts

@@ -2753,11 +2753,11 @@ function publishCameraHook(record: MountedBoard): void {
       const world = record.handle.world;
       const scene = record.handle.stageScene;
       const [x, z] = world.project(at.lat, at.lng);
-      const ground = world.groundAt(at.lat, at.lng);
+      const ground = record.handle.groundWorldY(at.lat, at.lng);
       const standoff = (at.standoffM ?? 20_000) / world.metresPerUnit;
       const lift =
         ((at.heightM ?? (at.standoffM ?? 20_000) * 0.6) / world.metresPerUnit) *
-        world.city.verticalExaggeration;
+        world.city.verticalExaggeration * record.handle.reliefScale();
       const azimuth = at.azimuth ?? 0.6;
       scene.controls.target.set(x, ground, z);
       scene.camera.position.set(