Implement State Management with Riverpod

[pbalduino]

Description

Add proper state management to separate audio logic from UI

Priority

🟡 Low

Category

Architecture

Details

• Integrate Riverpod for state management
• Separate audio processing logic from UI components
• Create providers for tuning state, audio state, and settings
• Improve testability by isolating business logic
• Ensure proper disposal of resources

Files Affected

• pubspec.yaml
• lib/main.dart
• lib/providers/ (new directory)
• lib/services/ (new directory)
• lib/screens/tuner_screen.dart

Acceptance Criteria

• Riverpod is properly integrated
• Audio logic is separated from UI
• State management is testable
• Resource disposal is handled correctly
• Code is more maintainable and organized