feat(mpris): Add comprehensive customization options for MPRIS widget

[bernardopg]

Overview

This PR adds 8 new JSON configuration options to fully customize the MPRIS widget, enabling layouts from ultra-compact (3 buttons only) to complete with all controls.

New Configuration Options

• show-title (boolean): Control title/player name visibility
• show-subtitle (boolean): Control artist-album subtitle visibility
• show-background (boolean): Control blurred background album art
• show-shuffle (boolean): Control shuffle button visibility
• show-repeat (boolean): Control repeat button visibility
• show-favorite (boolean): Control favorite button (placeholder for future implementation)
• button-size (integer): Custom button size in pixels
• compact-mode (boolean): Optimized compact layout (placeholder for future implementation)

Modified Files

Core Implementation

• src/controlCenter/widgets/mpris/mpris.vala: Extended Config struct with 8 new fields and JSON parsing logic
• src/controlCenter/widgets/mpris/mpris_player.vala: Updated methods to respect new configuration flags
• src/configSchema.json: Added 8 new properties with proper validation and defaults

Documentation

• MPRIS-CUSTOMIZATION.md: Complete feature documentation with examples
• TESTING-GUIDE.md: Testing guide with multiple configuration presets
• mpris-config-example.json: Configuration template file
• test-mpris-configs.sh: Interactive testing script with 4 presets

Configuration Examples

Ultra-Compact Mode

{
  "widget-config": {
    "mpris": {
      "show-album-art": "never",
      "show-title": false,
      "show-subtitle": false,
      "show-shuffle": false,
      "show-repeat": false
    }
  }
}

Minimalist Mode

{
  "widget-config": {
    "mpris": {
      "show-album-art": "when-available",
      "show-title": true,
      "show-subtitle": false,
      "show-shuffle": false,
      "show-repeat": false
    }
  }
}

Complete Mode

{
  "widget-config": {
    "mpris": {
      "show-album-art": "always",
      "show-title": true,
      "show-subtitle": true,
      "show-background": true,
      "show-shuffle": true,
      "show-repeat": true
    }
  }
}

Testing

Users can test different configurations using the included script:

cd ~/git-clones/SwayNotificationCenter
./test-mpris-configs.sh

Backward Compatibility

All changes maintain full backward compatibility. Existing configurations will continue to work with default values applied for new options.

Related Issues

This addresses the need for more flexible MPRIS widget customization, allowing users to optimize their notification center layout based on available screen space and personal preferences.