feat(themes): optional chat channel colors in theme schema

HellionChat/Themes/Theme.cs

@@ -8,5 +8,6 @@ public sealed record Theme(
     ThemeColors Colors,
     ThemeLayout Layout,
     ThemeTypography Typography,
-    bool IsBuiltIn
+    bool IsBuiltIn,
+    ThemeChatColors? ChatColors = null
 );

HellionChat/Themes/ThemeChatColors.cs

@@ -0,0 +1,11 @@
+using HellionChat.Code;
+
+namespace HellionChat.Themes;
+
+// Optional pro Theme. Wenn ein Theme ChatColors mitliefert, kann der
+// User sie per Klick im Themes-Tab auf Configuration.ChatColours anwenden.
+// Ein Theme ohne ChatColors (z.B. chat2-classic) lässt die User-Channel-
+// Farben unverändert.
+public sealed record ThemeChatColors(
+    IReadOnlyDictionary<ChatType, uint> Channels
+);

HellionChat/Themes/ThemeJsonLoader.cs

@@ -32,10 +32,35 @@ internal static class ThemeJsonLoader
             var colors = ReadColors(root.GetProperty("colors"));
             var layout = ReadLayout(root.GetProperty("layout"));
 
-            return new Theme(slug, name, author, description, colors, layout, new ThemeTypography(), IsBuiltIn: false);
+            ThemeChatColors? chatColors = null;
+            if (root.TryGetProperty("chatChannels", out var ch) && ch.ValueKind == JsonValueKind.Object)
+                chatColors = ReadChatColors(ch);
+
+            return new Theme(slug, name, author, description, colors, layout, new ThemeTypography(), IsBuiltIn: false, ChatColors: chatColors);
         }
     }
 
+    private static ThemeChatColors ReadChatColors(JsonElement el)
+    {
+        var dict = new Dictionary<HellionChat.Code.ChatType, uint>();
+        foreach (var prop in el.EnumerateObject())
+        {
+            // Property-Name ist der ChatType-Name als String (z.B. "Say", "Tell"),
+            // Value ist Hex wie bei den Theme-Colors. Unbekannte Channel-Names
+            // werden still übersprungen — Forward-Compat falls SE neue Channels
+            // einführt.
+            if (!Enum.TryParse<HellionChat.Code.ChatType>(prop.Name, ignoreCase: true, out var channel))
+                continue;
+            if (prop.Value.ValueKind != JsonValueKind.String)
+                continue;
+            var hex = prop.Value.GetString();
+            if (string.IsNullOrWhiteSpace(hex))
+                continue;
+            dict[channel] = HellionChat.Util.ColourUtil.HexToRgba(hex);
+        }
+        return new ThemeChatColors(dict);
+    }
+
     public static Theme LoadFromFile(string path)
     {
         var json = File.ReadAllText(path);

HellionChat/Themes/ThemeJsonWriter.cs

@@ -52,6 +52,14 @@ internal static class ThemeJsonWriter
             writer.WriteNumber("frameBorderSize",   theme.Layout.FrameBorderSize);
             writer.WriteEndObject();
 
+            if (theme.ChatColors is { Channels.Count: > 0 } cc)
+            {
+                writer.WriteStartObject("chatChannels");
+                foreach (var kvp in cc.Channels)
+                    writer.WriteString(kvp.Key.ToString(), $"#{kvp.Value:X8}");
+                writer.WriteEndObject();
+            }
+
             writer.WriteEndObject();
         }