Implement complete GPS speedometer functionality

Features implemented:
- Real-time GPS speed tracking with permission handling
- Customizable speed units (km/h, mph) with persistent settings
- Digital and analog speedometer display styles
- Dark/light theme support with system integration
- Optional metrics: coordinates, distance, trip time, GPS accuracy
- Trip reset functionality and error handling
- Modular architecture with Provider state management

Technical details:
- Added dependencies: geolocator, permission_handler, provider, shared_preferences
- Configured Android location permissions (FINE_LOCATION, COARSE_LOCATION)
- Portrait orientation lock for mobile-first experience
- Extensible settings system for future customization options
- Clean separation of concerns: providers, screens, widgets

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

pubspec.yaml

@@ -31,9 +31,19 @@ dependencies:
   flutter:
     sdk: flutter
 
-  # The following adds the Cupertino Icons font to your application.
-  # Use with the CupertinoIcons class for iOS style icons.
+  # UI Icons
   cupertino_icons: ^1.0.8
+  
+  # GPS and Location Services
+  geolocator: ^13.0.2
+  permission_handler: ^11.3.1
+  
+  # State Management and Settings
+  provider: ^6.1.2
+  shared_preferences: ^2.3.3
+  
+  # UI and Theming
+  flutter_material_color_picker: ^1.2.0
 
 dev_dependencies:
   flutter_test: