CCTV opens on the camera nearest the viewer, not the first in the catalog

Turning CCTV on picked the first catalog record, so at King's Cross it
showed a Sydney camera. enable() now picks the camera nearest the viewer.
Until someone chooses a camera, each settled move re-picks the nearest,
so a share link whose flight lands after CCTV turned on still opens
nearby.

src/layers/cctv/selection.js

@@ -83,6 +83,7 @@ export function createSelection({
     }
     layerState._activeCameraId = cameraId;
     layerState._autoHopSuspended = false;
+    layerState._openingCameraProvisional = false;
     // A real activation creates projection work — wake the self-stopping loop.
     parts.projection.startProjectionLoop();
     if (previousActiveRecord && previousActiveRecord !== record) {
@@ -169,6 +170,7 @@ export function createSelection({
     if (!record) return false;
     layerState._activeCameraId = null;
     layerState._autoHopSuspended = true;
+    layerState._openingCameraProvisional = false;
     record.activationDone = false;
     parts.geometry.clearProbeClampOnDeactivation(record, (previous) => {
       parts.geometry.applyFrustumGeometry(