feat: prioritize Bluetooth sensor data over GPS

- Restructured sensor logic to give absolute priority to Bluetooth sensors, largely ignoring GPS data for distance and speed calculations.
- Implemented downstream UI expansions, custom recording layouts, and new settings to reflect and control the new sensor-first flow.
- Added MediaNotificationListenerService and integrated media playback tracking within statistics.
- Modified VoiceAnnouncementUtils to harmonize announcements with the updated architecture.
- Added 'About This Fork' section to the README.

Note: These modifications were co-created with Antigravity AI.

src/main/java/de/dennisguse/opentracks/data/statistics/TrackStatisticsUpdater.java

@@ -143,7 +143,6 @@ public class TrackStatisticsUpdater {
         }
 
         {
-            // Update total distance
             Distance movingDistance = null;
             if (trackPoint.sensorDistance() != null) {
                 movingDistance = trackPoint.sensorDistance();
@@ -153,16 +152,7 @@ public class TrackStatisticsUpdater {
                 // GPS-based distance/speed
                 movingDistance = trackPoint.distanceToPrevious(lastTrackPoint);
             }
-            if (movingDistance != null) {
-                currentSegment.addTotalDistance(movingDistance);
-            }
-
-            if (!isIdle
-                    && !trackPoint.isSegmentManualStart()
-                    && lastTrackPoint != null) {
-                currentSegment.addMovingTime(trackPoint, lastTrackPoint);
-            }
-
+            boolean isIdleTransition = false;
             if (trackPoint.isIdleTriggered()) {
                 isIdle = true;
             } else if (isIdle) {
@@ -170,6 +160,26 @@ public class TrackStatisticsUpdater {
                 if (movingDistance != null
                         && movingDistance.greaterOrEqualThan(PreferencesUtils.getRecordingDistanceInterval())) {
                     isIdle = false;
+                    isIdleTransition = true;
+                }
+            }
+
+            if (movingDistance != null && !isIdle) {
+                currentSegment.addTotalDistance(movingDistance);
+            }
+
+            if (!isIdle
+                    && !trackPoint.isSegmentManualStart()
+                    && lastTrackPoint != null) {
+                if (isIdleTransition) {
+                    if (trackPoint.position().hasSpeed() && trackPoint.position().speed().toMPS() > 0) {
+                        double timeSeconds = movingDistance.toM() / trackPoint.position().speed().toMPS();
+                        currentSegment.addMovingTime(Duration.ofMillis((long)(timeSeconds * 1000)));
+                    } else {
+                        currentSegment.addMovingTime(Duration.ofMillis((long)(movingDistance.toM() * 1000)));
+                    }
+                } else {
+                    currentSegment.addMovingTime(trackPoint, lastTrackPoint);
                 }
             }