Enhance music island robustness with comprehensive error handling and validation

[Copilot]

Overview

This PR significantly improves the robustness and reliability of the Dynamic Island music display system by implementing comprehensive error handling, input validation, and recovery mechanisms. The music island now gracefully handles edge cases, provides better debugging capabilities, and includes extensive troubleshooting documentation.

Key Improvements

🛡️ Robust Error Handling

The music island system now includes comprehensive error handling throughout:

• JSON Validation: The handler now safely processes malformed or incomplete JSON data from music applications, falling back to sensible defaults when data is missing or corrupted
• Graceful Degradation: When artwork fails to load or SketchyBar commands fail, the system continues to display available information rather than crashing
• Process Safety: All dynamic-island-sketchybar calls now include error handling to prevent script failures

🎯 Smart Text Processing

Enhanced text handling for song titles and artist names:

# Before: Hard character truncation
"This is a very long song title" → "This is a very long so..."

# After: Word-boundary aware truncation  
"This is a very long song title" → "This is a very long..."

• Respects word boundaries when truncating text
• Sanitizes non-printable characters
• Handles unicode characters properly
• Prevents display issues with special characters

⚙️ Configuration Validation

The system now validates all configuration parameters and applies intelligent defaults:

# Invalid config values are automatically detected and corrected:
P_DYNAMIC_ISLAND_MUSIC_INFO_EXPAND_HEIGHT="invalid" → defaults to 100
P_DYNAMIC_ISLAND_MONITOR_HORIZONTAL_RESOLUTION="" → defaults to 1512

🔧 Enhanced Cava Visualizer Management

Improved audio visualizer reliability:

• Process Lifecycle: Proper cleanup prevents zombie cava processes
• Retry Logic: Exponential backoff for failed audio connections
• Audio Input Validation: Checks for Background Music availability before starting
• Resource Management: Prevents accumulation of failed processes

🐛 Debug Mode & Troubleshooting

Added comprehensive debugging support:

# Enable debug mode in userconfig.sh
P_DYNAMIC_ISLAND_MUSIC_DEBUG=1

# View detailed logs
tail -f /var/log/system.log | grep MUSIC_DEBUG

• Optional debug logging for troubleshooting issues
• Detailed troubleshooting guide (MUSIC_TROUBLESHOOTING.md)
• Common error explanations and solutions
• Manual testing procedures

Edge Cases Handled

The system now properly handles numerous edge cases that could previously cause failures:

• Empty or malformed JSON from music applications
• Missing song metadata (title, artist, or state)
• Artwork loading failures
• SketchyBar communication errors
• Invalid configuration values
• Audio input device unavailability
• Process cleanup on unexpected termination

Testing

Comprehensive testing validates all improvements:

• ✅ JSON validation with various malformed inputs
• ✅ Text truncation edge cases including unicode
• ✅ Configuration validation with invalid values
• ✅ Error injection testing for graceful failure handling
• ✅ Process management and cleanup verification

Backward Compatibility

All changes are fully backward compatible. Existing configurations will continue to work, with the system automatically applying sensible defaults for any missing or invalid values.

Documentation

Added comprehensive troubleshooting documentation (MUSIC_TROUBLESHOOTING.md) covering:

• Quick fixes for common issues
• Debug mode setup and usage
• Performance optimization tips
• Advanced troubleshooting procedures
• Error message explanations

This ensures users can easily diagnose and resolve music island issues independently.

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