Copilot/replace maui with avaloniaui

[sassdawe]

This pull request migrates the desktop GUI from .NET MAUI to Avalonia UI, unifying cross-platform support and simplifying the build and packaging process. The changes update the project files, workflow, and documentation to reflect the new Avalonia-based implementation and remove all MAUI-specific code and assets.

Migration to Avalonia UI:

• Replaced the MAUI-based application with a new Avalonia UI implementation, adding App.axaml and App.axaml.cs as the new application entry points and removing all MAUI-specific files such as App.xaml, App.xaml.cs, AppShell.xaml, AppShell.xaml.cs, MainPage.xaml, and MainPage.xaml.cs. [1] [2] [3] [4] [5] [6] [7] [8]

• Updated the project file AtsScanner.Gui.csproj to target Avalonia UI, referencing Avalonia packages and removing all MAUI-specific references, properties, and assets. The target framework is now net10.0 for all platforms.

Build and Packaging Workflow Updates:

• Simplified the GitHub Actions workflow in .github/workflows/release.yml to build and package Avalonia apps for Windows, macOS (x64 and arm64), and Linux, removing MAUI workload steps and platform-specific target frameworks. [1] [2] [3] [4]

Documentation Updates:

• Updated the README.md to reflect the migration from MAUI to Avalonia UI, clarifying that the GUI now targets Windows, macOS, and Linux with the standard .NET SDK and no longer requires the MAUI workload.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	avalonia@​12.1.1
	avalonia.fonts.inter@​12.1.1
	avalonia.themes.fluent@​12.1.1
	avalonia.desktop@​12.1.1

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[Copilot]

Pull request overview

This PR migrates the desktop GUI (src/AtsScanner.Gui) from .NET MAUI to Avalonia UI to provide a single cross-platform desktop target (Windows/macOS/Linux) and simplify publishing/packaging.

Changes:

• Replaced MAUI app entry points/pages/resources with an Avalonia App.axaml + MainWindow.axaml implementation and updated the GUI ViewModels for Avalonia types (e.g., IBrush).
• Updated AtsScanner.Gui.csproj to a single net10.0 target with Avalonia package references, removing MAUI-specific configuration/assets.
• Simplified the release workflow to publish self-contained GUI builds for win-x64, osx-x64, osx-arm64, and linux-x64 without MAUI workload steps; updated README accordingly.

Reviewed changes

Copilot reviewed 32 out of 37 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/AtsScanner.Gui/ViewModels/ScanResultViewModel.cs	Switches score color output from MAUI Color to Avalonia IBrush for UI bindings.
src/AtsScanner.Gui/ViewModels/IssueDisplay.cs	Switches severity icon color output from MAUI Color to Avalonia IBrush.
src/AtsScanner.Gui/ViewModels/MainViewModel.cs	Removes MAUI file picker logic; adapts commands to Avalonia-friendly ICommand implementations.
src/AtsScanner.Gui/ViewModels/RelayCommand.cs	Adds a simple synchronous ICommand implementation for Avalonia.
src/AtsScanner.Gui/ViewModels/AsyncRelayCommand.cs	Adds an async ICommand implementation for scan execution.
src/AtsScanner.Gui/Resources/Styles/Styles.xaml	Removes MAUI style resources.
src/AtsScanner.Gui/Resources/Styles/Colors.xaml	Removes MAUI color resources.
src/AtsScanner.Gui/Resources/Splash/splash.svg	Removes MAUI splash asset.
src/AtsScanner.Gui/Resources/Raw/AboutAssets.txt	Removes MAUI raw-asset template file.
src/AtsScanner.Gui/Resources/AppIcon/appiconfg.svg	Removes MAUI icon foreground asset.
src/AtsScanner.Gui/Resources/AppIcon/appicon.svg	Removes MAUI icon asset.
src/AtsScanner.Gui/Properties/launchSettings.json	Renames the debug launch profile to a clearer GUI-specific name.
src/AtsScanner.Gui/Program.cs	Adds Avalonia app bootstrap (classic desktop lifetime, Inter font, trace logging).
src/AtsScanner.Gui/Platforms/Windows/Package.appxmanifest	Removes MAUI/WinUI packaging manifest.
src/AtsScanner.Gui/Platforms/Windows/App.xaml.cs	Removes MAUI WinUI host app entry point.
src/AtsScanner.Gui/Platforms/Windows/App.xaml	Removes MAUI WinUI XAML host.
src/AtsScanner.Gui/Platforms/Windows/app.manifest	Removes MAUI Windows manifest.
src/AtsScanner.Gui/Platforms/MacCatalyst/Program.cs	Removes MAUI MacCatalyst entry point.
src/AtsScanner.Gui/Platforms/MacCatalyst/Info.plist	Removes MAUI MacCatalyst plist.
src/AtsScanner.Gui/Platforms/MacCatalyst/Entitlements.plist	Removes MAUI MacCatalyst entitlements.
src/AtsScanner.Gui/Platforms/MacCatalyst/AppDelegate.cs	Removes MAUI MacCatalyst app delegate.
src/AtsScanner.Gui/MauiProgram.cs	Removes MAUI app builder/bootstrap code.
src/AtsScanner.Gui/MainWindow.axaml.cs	Adds Avalonia Window code-behind for file picking, result expansion toggle, and sponsor link.
src/AtsScanner.Gui/MainWindow.axaml	Adds Avalonia UI layout for file selection, platform selection, scanning, and results display.
src/AtsScanner.Gui/MainPage.xaml.cs	Removes MAUI page code-behind.
src/AtsScanner.Gui/MainPage.xaml	Removes MAUI page XAML.
src/AtsScanner.Gui/AtsScanner.Gui.csproj	Replaces MAUI multi-target configuration with Avalonia packages and a single net10.0 target.
src/AtsScanner.Gui/AppShell.xaml.cs	Removes MAUI Shell code-behind.
src/AtsScanner.Gui/AppShell.xaml	Removes MAUI Shell XAML.
src/AtsScanner.Gui/App.xaml.cs	Removes MAUI app class.
src/AtsScanner.Gui/App.xaml	Removes MAUI application XAML/resources.
src/AtsScanner.Gui/App.axaml.cs	Adds Avalonia Application initialization and desktop main window creation.
src/AtsScanner.Gui/App.axaml	Adds Avalonia application styling (Fluent theme).
README.md	Updates GUI documentation/commands to reflect Avalonia and standard .NET SDK usage.
.github/workflows/release.yml	Updates GUI build matrix to win-x64/osx-x64/osx-arm64/linux-x64, removes MAUI workload steps, and adjusts publish verification/packaging.