fix(camera): keep a deferred recovery check through long holds

A Director hold longer than the settle check's five-minute bound used
to expire the deferred check, so a run that ended on a stars-only shot
after a long hold stayed there until the next move. While a flight or a
playing scene defers the check, its bound no longer counts down; the
flight or scene bounds the deferral itself.

Also correct the trackball note in CURRENT-STATE: Cesium's tilt tests
the screen centre, so any tilt (drag or touch) with the centre on the
stars between 1,000 and 7,500 km now tilts about the planet's edge or
does nothing, wherever it starts. Rotation drags that start on the
planet are unchanged.

src/app/application.test.mjs

@@ -765,6 +765,8 @@ test('a check a scene or flight defers runs once it ends', () => {
     // A hold on a stars-only shot: quiet, with or without Cesium's moveEnd.
     for (let i = 0; i < 4; i += 1) timers.tick();
     if (viaMoveEnd) camera.moveEnd.raiseEvent();
+    // Longer than the settle check's five-minute bound.
+    for (let i = 0; i < 1500; i += 1) timers.tick();
     assert.equal(globeOutOfFrame(camera), true, 'left alone while it plays');
     assert.equal(timers.pending(), 1, 'still watching');
     playing = false;