New theme service that supports window backdrop.

Wino.Core.Domain/Enums/WindowBackdropType.cs

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+namespace Wino.Core.Domain.Enums;
+
+public enum WindowBackdropType
+{
+    None,
+    Mica,
+    MicaAlt,
+    DesktopAcrylic,
+    AcrylicBase,
+    AcrylicThin
+}

Wino.Core.Domain/Interfaces/INewThemeService.cs

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+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Models.Personalization;
+
+namespace Wino.Core.Domain.Interfaces;
+
+public interface INewThemeService : IInitializeAsync
+{
+    event EventHandler<ApplicationElementTheme> ElementThemeChanged;
+    event EventHandler<string> AccentColorChanged;
+    event EventHandler<WindowBackdropType> BackdropChanged;
+
+    Task<List<AppThemeBase>> GetAvailableThemesAsync();
+    Task<CustomThemeMetadata> CreateNewCustomThemeAsync(string themeName, string accentColor, byte[] wallpaperData);
+    Task<List<CustomThemeMetadata>> GetCurrentCustomThemesAsync();
+    List<string> GetAvailableAccountColors();
+    Task ApplyCustomThemeAsync(bool isInitializing);
+
+    // Window Backdrop Management
+    WindowBackdropType CurrentBackdropType { get; set; }
+    void ApplyBackdrop(WindowBackdropType backdropType);
+
+    // Settings
+    ApplicationElementTheme RootTheme { get; set; }
+    Guid? CurrentApplicationThemeId { get; set; }
+    string AccentColor { get; set; }
+    string GetSystemAccentColorHex();
+    bool IsCustomTheme { get; }
+
+    // Improved accent color management
+    Task SetAccentColorAsync(string hexColor, bool preserveTheme = true);
+
+    // Backdrop management
+    List<BackdropTypeWrapper> GetAvailableBackdropTypes();
+}

Wino.Core.Domain/Models/Personalization/BackdropTypeWrapper.cs

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+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain.Models.Personalization;
+
+public class BackdropTypeWrapper
+{
+    public WindowBackdropType BackdropType { get; set; }
+    public string DisplayName { get; set; }
+
+    public BackdropTypeWrapper(WindowBackdropType backdropType, string displayName)
+    {
+        BackdropType = backdropType;
+        DisplayName = displayName;
+    }
+
+    public override string ToString()
+    {
+        return DisplayName;
+    }
+}