Add custom campaign roll composer

RpgRoller.Tests/Services/WorkspaceQueryServiceTests.cs

@@ -50,6 +50,7 @@ public sealed class WorkspaceQueryServiceTests
 
         Assert.Equal(401, exception.StatusCode);
         Assert.Equal("You must be logged in.", exception.Message);
+        Assert.Equal("unauthorized", exception.ErrorCode);
     }
 
     private static WorkspaceSessionTokenAccessor CreateSessionTokenAccessor(string sessionToken)
@@ -95,6 +96,7 @@ public sealed class WorkspaceQueryServiceTests
         public ServiceResult<bool> DeleteSkill(string sessionToken, Guid skillId) => throw new NotSupportedException();
         public ServiceResult<CharacterSheet> GetCharacterSheet(string sessionToken, Guid characterId) => throw new NotSupportedException();
         public ServiceResult<RollResult> RollSkill(string sessionToken, Guid skillId, string visibility) => throw new NotSupportedException();
+        public ServiceResult<RollResult> RollCustom(string sessionToken, Guid characterId, string expression, string visibility) => throw new NotSupportedException();
         public ServiceResult<IReadOnlyList<CampaignLogEntry>> GetCampaignLog(string sessionToken, Guid campaignId) => throw new NotSupportedException();
         public ServiceResult<CampaignLogPage> GetCampaignLogPage(string sessionToken, Guid campaignId, Guid? afterRollId = null, int? limit = null) => throw new NotSupportedException();
         public ServiceResult<CampaignRollDetail> GetRollDetail(string sessionToken, Guid rollId) => throw new NotSupportedException();