- Added provider ^6.1.2 and shared_preferences ^2.3.4 to pubspec.yaml
- Removed singleton pattern from GpsDataManager (deleted _instance and instance getter)
- Changed GpsDataManager._internal() to public GpsDataManager() constructor
- Extended ChangeNotifier to enable reactive state updates
- Added _isDisposed guard field to prevent disposed notifications
- Updated _updateData() to call notifyListeners() after stream emission
- Added _isDisposed guards to _onGpsError() and _handleStaleDataTimeout()
- Updated dispose() to set _isDisposed, call super.dispose() last, removed _isInitialized reset
Mikkeli Matlock
f458b62eea