Hold a voice orbit, pan or rotate until its fly-to lands

"Fly to Paris and orbit it" reaches the app as two sibling tool calls,
which OpenAI runs at once. With a place that needs a lookup, the orbit
started over the old view and the late flight then replaced it; with a
known place, pan and rotate cancelled the flight already in the air.

Orbit, pan and rotate now wait for a pending voice flight the same way
tilt does: up to 30 s, and not run (saying so) if the flight is
cancelled, finds nothing or times out. Stop and rotate_globe do not
wait. Orbit keeps its own arming for flights the voice runner does not
track.

src/cameraVerbs.js

@@ -1747,9 +1747,11 @@ export function moveCamera(args = {}, runNavigation = null) {
     }
     if (motion === 'orbit') {
       if (_viewer.scene.tweens.length > 0) {
-        // A camera flight is in progress ("fly to X and orbit it") — ALWAYS arm
-        // and capture at the destination; a target existing right now is
-        // meaningless (the globe is always under the crosshair).
+        // A camera flight is in progress — ALWAYS arm and capture at the
+        // destination; a target existing right now is meaningless (the globe
+        // is always under the crosshair). The voice runner already holds an
+        // orbit until its own fly-to lands; this covers any other
+        // flight.
         setActiveMotion({
           kind: 'orbit',
           direction: direction || 'right',