docs: add documentation to controls

namespace GarrigueGamesLauncher.Controls;

/// <summary>

/// A navigation control providing "Back" and "Forward" arrow buttons.

/// It exposes commands and state indicators for enabling or disabling navigation.

/// </summary>

public class BackForwardArrows : ContentControl

{

    public static readonly StyledProperty<ICommand?> GoBackCommandProperty =

namespace GarrigueGamesLauncher.Controls;

/// <summary>

/// A dropdown control that displays a list of genre tag checkbox items.

/// Provides a toggle button to show/hide the dropdown and exposes a command

/// that is executed whenever any checkbox item changes state.

/// </summary>

public partial class CheckboxDropdown : ContentControl

{

    private Popup? _popup;

namespace GarrigueGamesLauncher.Controls;

/// <summary>

/// A simple grid control for displaying a collection of images in a grid format.

/// Used on game pages.

/// </summary>

public class GalleryGrid : ContentControl

{

    public static readonly StyledProperty<ICollection<IImage>> ImagesSourceProperty =

namespace GarrigueGamesLauncher.Controls;

/// <summary>

/// A grid control for displaying a collection of game cards on the Library and Discover pages.

/// Each game card is represented as a <see cref="GameCardViewModel"/> containing additional logic.

/// </summary>

public class GameGrid : ContentControl

{

    public static readonly StyledProperty<ObservableCollection<GameCardViewModel>> GamesSourceProperty =

namespace GarrigueGamesLauncher.Controls;

/// <summary>

/// A simple control for displaying a single hero image with a gradient transition

/// into the rest of the page content

/// </summary>

public class HeroImage : ContentControl

{

    public static readonly StyledProperty<IImage> ImageProperty =