Add support for shared client themes in messages

Introduces the SharedClientTheme class and BaseTheme enum to represent and deserialize shared client theme data in Discord messages. Updates DiscordMessage to include a SharedClientTheme property for accessing theme information.

Author: Lulalaby

DisCatSharp/Entities/Message/DiscordMessage.cs

@@ -493,6 +493,12 @@ public bool HasPoll
 	[JsonProperty("soundboard_sounds", NullValueHandling = NullValueHandling.Ignore)]
 	public List<DiscordSoundboardSound>? SoundboardSounds { get; internal set; }
 
+	/// <summary>
+	///    Gets the shared client theme in this message, if applicable.
+	/// </summary>
+	[JsonProperty("shared_client_theme")]
+	public SharedClientTheme? SharedClientTheme { get; set; }
+
 	/// <summary>
 	///     Checks whether this <see cref="DiscordMessage" /> is equal to another <see cref="DiscordMessage" />.
 	/// </summary>

DisCatSharp/Entities/Message/SharedClientTheme.cs

@@ -0,0 +1,37 @@
+using System.Collections.Generic;
+
+using DisCatSharp.Enums;
+
+using Newtonsoft.Json;
+
+namespace DisCatSharp.Entities;
+
+/// <summary>
+///     Represents the shared client theme for a message.
+/// </summary>
+public class SharedClientTheme
+{
+	/// <summary>
+	///     Gets or sets the colors for the theme.
+	/// </summary>
+	[JsonProperty("colors")]
+	public List<string> Colors { get; set; } = [];
+
+	/// <summary>
+	///     Gets or sets the gradient angle (direction in degrees).
+	/// </summary>
+	[JsonProperty("gradient_angle")]
+	public int GradientAngle { get; set; }
+
+	/// <summary>
+	///     Gets or sets the color intensity percentage (base mix). <c>0</c> is no mix, <c>100</c> is full mix.
+	/// </summary>
+	[JsonProperty("base_mix")]
+	public int BaseMix { get; set; }
+
+	/// <summary>
+	///     Gets or sets the appearance.
+	/// </summary>
+	[JsonProperty("base_theme")]
+	public BaseTheme BaseTheme { get; set; }
+}

DisCatSharp/Enums/Message/BaseTheme.cs

@@ -0,0 +1,17 @@
+namespace DisCatSharp.Enums;
+
+/// <summary>
+///    Represents the base theme of a shared client theme.
+/// </summary>
+public enum BaseTheme
+{
+	/// <summary>
+	///     Dark theme.
+	/// </summary>
+	Dark = 1,
+
+	/// <summary>
+	///    Light theme.
+	/// </summary>
+	Light = 2
+}