chore: migrate to nitromodule

[hyochan]

Overview

This PR migrates react-native-audio-recorder-player from the traditional React Native bridge architecture to the modern Nitro Modules framework, providing significant performance improvements and better type safety.

Key Changes

🚀 Performance Improvements

• Up to 15x faster native module calls using JSI (JavaScript Interface)
• Direct communication between JS and native code without bridge serialization
• Reduced update interval from 500ms to 25ms for smoother UI updates
• Optimized metering calculations with square root normalization

🏗️ Architecture Migration

• Migrated from React Native bridge to Nitro Modules
• Implemented TypeScript-first approach with full type safety
• Direct Swift and Kotlin support without Objective-C/Java wrappers
• Modern async/await pattern support with suspending functions

📱 Platform-Specific Improvements

Android

• Fixed metering calculation to return normalized values (0-1) instead of dB
• Added random noise (0.05-0.1) when amplitude is 0 to show meter activity
• Fixed recording/playback time synchronization issues
• Improved error handling with file existence checks
• Fixed playback issues with proper MediaPlayer lifecycle management

iOS

• Maintained existing functionality with Nitro wrapper
• Consistent dB metering values for compatibility

🎨 Example App Enhancements

• Fixed playback gauge overflow issue
• Aligned recording and playback gauge widths
• Improved UI responsiveness with 25ms update intervals
• Platform-specific metering normalization
• Fixed Android permission handling for modern API levels

Technical Details

New Files

• src/nitro/specs/AudioRecorderPlayer.nitro.ts - TypeScript interface definition
• src/nitro/AudioRecorderPlayerNitro.ts - JavaScript wrapper
• ios/HybridAudioRecorderPlayer.swift - iOS Nitro implementation
• android/src/main/java/com/audiorecorderplayer/nitro/HybridAudioRecorderPlayer.kt - Android Nitro implementation
• nitro.json - Nitro configuration

Removed Files

• Legacy bridge files (RNAudioRecorderPlayer.m/h/swift, RNAudioRecorderPlayerModule.kt)
• Deprecated implementation files

Dependencies

• Added react-native-nitro-modules for core Nitro functionality
• Added nitro-codegen for code generation

Breaking Changes

None - Full backward compatibility maintained through wrapper exports.

Testing

• ✅ Recording functionality on iOS/Android
• ✅ Playback functionality on iOS/Android
• ✅ Metering visualization
• ✅ Pause/Resume operations
• ✅ File path handling
• ✅ Permission management
• ✅ Example app functionality

Migration Guide

No changes required for existing users. The module exports remain the same:

import AudioRecorderPlayer from 'react-native-audio-recorder-player';
// Works exactly as before