[FEAT] - Port application to macOS (Initial Setup)

[dylanlangston]

Is your feature request related to a problem? Please describe.

Currently, AvaloniaXKCD does not have native macOS support configured. Users on macOS cannot build or run the application natively, limiting the app's accessibility and cross-platform reach.

Describe the solution you'd like

Enable AvaloniaXKCD to build and run natively on macOS using Avalonia's platform-specific tooling and configuration. This involves:

• Using the existing Desktop project (e.g., AvaloniaXKCD.Desktop) following the official Avalonia UI guide for macOS development
• Verifying that the existing AvaloniaXKCD.Generators project builds correctly and generates source files for the macOS target
• Implementing necessary deployment steps for macOS
• Testing on a macOS environment (physical device or VM)
• Validating application launch, window scaling, and rendering fidelity
• Testing keyboard/mouse interactions and comic navigation

References:

• Avalonia macOS Development Guide
• Avalonia macOS Deployment Guide

Describe alternatives you've considered

• Using a Windows VM or Wine compatibility layer, but native support provides better performance and user experience.
• Web-only WASM deployment, but prefer native applications for better OS integration.

Additional context

Acceptance Criteria:

• The app builds and runs on macOS without runtime errors
• All UI components render correctly
• Window controls and interactions work as expected
• Documentation exists explaining how to build and run on macOS

This is an excellent first issue for contributors to familiarize themselves with Avalonia's cross-platform build process.