live mission details in footer implemented

app/test/domain/mission_stats_test.dart

@@ -34,4 +34,80 @@ void main() {
       expect(stats.durationSec, closeTo(leg1 / 20 + leg2 / 10, 0.1));
     });
   });
+
+  group('computeFlyMissionStatus', () {
+    final waypoints = [_wp(0, 0), _wp(0, 0.01), _wp(0, 0.02)];
+
+    test('kein aktiver Wegpunkt (null) ergibt null', () {
+      expect(
+        computeFlyMissionStatus(waypoints: waypoints, activeWaypointIndex: null),
+        isNull,
+      );
+    });
+
+    test('activeWaypointIndex ausserhalb der Liste ergibt null', () {
+      expect(
+        computeFlyMissionStatus(waypoints: waypoints, activeWaypointIndex: 3),
+        isNull,
+      );
+      expect(
+        computeFlyMissionStatus(waypoints: waypoints, activeWaypointIndex: -1),
+        isNull,
+      );
+    });
+
+    test('activeWaypointNumber ist 1-basiert (Index 1 -> Nummer 2)', () {
+      final status = computeFlyMissionStatus(
+        waypoints: waypoints,
+        activeWaypointIndex: 1,
+      );
+      expect(status!.activeWaypointNumber, 2);
+      expect(status.waypointCount, 3);
+    });
+
+    test('ohne Position (kein Fix) bleiben Distanz/ETA null', () {
+      final status = computeFlyMissionStatus(
+        waypoints: waypoints,
+        activeWaypointIndex: 1,
+      );
+      expect(status!.distanceToActiveWaypointM, isNull);
+      expect(status.etaToActiveWaypointSec, isNull);
+    });
+
+    test('mit Position wird die Distanz zum aktiven Wegpunkt berechnet', () {
+      final status = computeFlyMissionStatus(
+        waypoints: waypoints,
+        activeWaypointIndex: 1,
+        currentLat: 0,
+        currentLon: 0,
+      );
+      // Wegpunkt 1 (Index 1) liegt bei (0, 0.01) - rund 1112.6 m vom
+      // Ursprung entfernt.
+      expect(status!.distanceToActiveWaypointM, closeTo(1112.6, 1));
+      // Ohne Geschwindigkeit keine ETA.
+      expect(status.etaToActiveWaypointSec, isNull);
+    });
+
+    test('mit Position und Geschwindigkeit wird die ETA berechnet', () {
+      final status = computeFlyMissionStatus(
+        waypoints: waypoints,
+        activeWaypointIndex: 1,
+        currentLat: 0,
+        currentLon: 0,
+        currentSpeedMs: 10,
+      );
+      expect(status!.etaToActiveWaypointSec, closeTo(1112.6 / 10, 0.1));
+    });
+
+    test('unter 0.5 m/s wird keine (irrefuehrende) ETA berechnet', () {
+      final status = computeFlyMissionStatus(
+        waypoints: waypoints,
+        activeWaypointIndex: 1,
+        currentLat: 0,
+        currentLon: 0,
+        currentSpeedMs: 0.1,
+      );
+      expect(status!.etaToActiveWaypointSec, isNull);
+    });
+  });
 }