Comprehensive application overhaul: Refactor architecture and add configurability (v0.4.0)

[Copilot]

Application Overhaul Assessment and Implementation - COMPLETED ✅

Summary

Successfully completed comprehensive overhaul of the Cycles CPU monitoring application (v0.3.4 → v0.4.0).

Completed Tasks

• Analyze current codebase structure and identify issues
• Review code comments and TODOs
• Build and verify current functionality
• Refactor code organization (split into multiple files)
• Add proper error handling and logging
• Implement configuration system for settings
• Add command-line flags for customization
• Improve code documentation
• Add unit tests for core functionality (7 tests passing)
• Update version number to 0.4.0
• Update README with new features
• Update AppImage workflow with new version
• Add CHANGELOG to track changes
• Run go fmt and go vet
• Add Help menu with About dialog
• Display system information
• Update vendor directory
• Create comprehensive documentation
• Fix CI build failures

Key Improvements

Code Organization:

• Refactored from single 325-line file to 8 modular files
• Clear separation of concerns
• Each module has single responsibility

New Features:

• ✅ Configuration system with 4 command-line flags
• ✅ Help menu with About dialog
• ✅ System information display
• ✅ Configurable grid layout, update interval, history size, core type

Quality Improvements:

• ✅ 7 unit tests (100% pass rate)
• ✅ Comprehensive error handling
• ✅ Proper logging throughout
• ✅ Zero linter warnings
• ✅ Formatted and vetted code
• ✅ CI builds fixed

Documentation:

• ✅ Enhanced README with setup instructions
• ✅ CHANGELOG.md tracking version history
• ✅ OVERHAUL_SUMMARY.md documenting all changes
• ✅ DEVELOPER_GUIDE.md for contributors
• ✅ Inline code documentation

CI Build Fix

Added explicit go mod download step to the AppImage workflow to ensure dependencies are properly downloaded before building. This resolves build failures in the CI environment.

All tests passing ✅ | Build successful ✅ | Documentation complete ✅ | CI fixed ✅

Original prompt

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This section details on the original issue you should resolve

<issue_title>Assess an overhaul of the application and what could be useful additions/enhancements/fixes</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #1

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[TylerCode]

Great work, approved

[TylerCode]

@copilot looks like some builds are failing.

[Copilot]

@copilot looks like some builds are failing.

Fixed in commit 7d8e8ba. Added explicit go mod download step to the AppImage workflow to ensure dependencies are downloaded before building.

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