Handle generic types in proto message name generation

Generic types like Translation<T> now produce qualified message names
(e.g. TranslationOfFaqTranslationQueryItem) to avoid duplicate message
definitions in generated .proto files.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Svrnty.CQRS.Grpc.Generators/ProtoTypeMapper.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using Microsoft.CodeAnalysis;
 
 namespace Svrnty.CQRS.Grpc.Generators;
@@ -151,13 +152,27 @@ internal static class ProtoFileTypeMapper
         // Complex types (classes/records) become message types
         if (typeSymbol.TypeKind == TypeKind.Class || typeSymbol.TypeKind == TypeKind.Struct)
         {
-            return typeName; // Reference the message type by name
+            return GetProtoMessageName(typeSymbol); // Reference the message type by name (handles generics)
         }
 
         // Fallback
         return "string"; // Default to string for unknown types
     }
 
+    /// <summary>
+    /// Gets the proto message name for a type, handling generic types by qualifying
+    /// with type arguments. e.g. Translation&lt;FaqTranslationQueryItem&gt; becomes TranslationOfFaqTranslationQueryItem.
+    /// </summary>
+    public static string GetProtoMessageName(ITypeSymbol typeSymbol)
+    {
+        if (typeSymbol is INamedTypeSymbol namedType && namedType.IsGenericType && namedType.TypeArguments.Length > 0)
+        {
+            var typeArgs = string.Join("And", namedType.TypeArguments.Select(t => GetProtoMessageName(t)));
+            return $"{namedType.Name}Of{typeArgs}";
+        }
+        return typeSymbol.Name;
+    }
+
     /// <summary>
     /// Converts C# PascalCase property name to proto snake_case field name.
     /// Uses simple conversion: add underscore before each uppercase letter (except first).