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.

.idea/AndroidProjectSystem.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AndroidProjectSystem">
+    <option name="providerId" value="com.android.tools.idea.GradleProjectSystem" />
+  </component>
+</project>