fix(ui): explicit navigation releases flights when an engine leaves out military awareness

On Navara the military-awareness module has no controls, so its
releaseCameraOwnership was skipped silently and a city pill, voice
fly_to_location or reset ended the follow but kept the aircraft selected.
The trackers it would release are released directly instead, as on
Cesium (selection and follow both cleared).

src/ui/cameraOrientationControls.test.mjs

@@ -811,3 +811,36 @@ test("north-up and tilt inside an engine's own follow keep following (Navara)",
   handle.stop();
   engine.destroy();
 });
+
+test('a navigation releases the flights follow when military awareness has no controls (Navara)', () => {
+  const stopped = [];
+  const navigation = new NavigationController({
+    viewer: null,
+    engine: createFakeEngine(),
+    tracking: {
+      flightsLayer: {
+        stopTracking: ({ origin }) => stopped.push(`flights:${origin}`),
+      },
+      militaryFlightsLayer: {
+        stopTracking: ({ origin }) => stopped.push(`military:${origin}`),
+      },
+      satellitesLayer: {},
+      aisLiveVesselsLayer: { clearSelection: () => stopped.push('vessels') },
+      // A layer this engine leaves out: its module, without the controls.
+      militaryAwarenessLayer: {},
+      rocketLaunchesLayer: {},
+    },
+    isCockpitActive: () => false,
+    cancelOrientation() {},
+    clearLocation() {},
+    cancelShareSelection() {},
+    interruptCameraMotion() {},
+    stopOrbit() {},
+    showToast() {},
+  });
+  assert.equal(
+    navigation._releaseFollowCamera({ preserveVesselSelection: false }),
+    false,
+  );
+  assert.deepEqual(stopped, ['flights:tool', 'military:tool', 'vessels']);
+});

src/ui/locationNavigation.js

@@ -327,6 +327,10 @@ export class LocationNavigation {
     this._stopOrbit();
     this.cockpitView?.exit({ restoreTracking: false });
     try {
+      // A layer an engine leaves out (military awareness on Navara) has no
+      // controls: release the trackers it would release, below.
+      if (typeof militaryAwarenessLayer?.releaseCameraOwnership !== 'function')
+        throw new Error('no military awareness controls');
       militaryAwarenessLayer.releaseCameraOwnership?.({ origin: 'tool' });
     } catch {
       // Keep reset available if Context has not initialized completely.

src/ui/navigationController.js

@@ -145,6 +145,10 @@ export class NavigationController {
     } = this.tracking;
     let contactSelected = false;
     try {
+      // A layer an engine leaves out (military awareness on Navara) has no
+      // controls: release the trackers it would release, below.
+      if (typeof militaryAwarenessLayer?.releaseCameraOwnership !== 'function')
+        throw new Error('no military awareness controls');
       contactSelected = Boolean(
         militaryAwarenessLayer.releaseCameraOwnership?.({
           preserveVesselSelection,