Make the workspace optional when building a chat launcher

app/MindWork AI Studio/Dialogs/DirectChatLauncherSettingsDialog.razor

@@ -32,8 +32,7 @@
                                                 @bind-ProfileId="@this.profileId"
                                                 @bind-ChatTemplateId="@this.chatTemplateId"
                                                 @bind-DataSourceIds="@this.dataSourceIds"
-                                                @bind-ToolIds="@this.toolIds"
-                                                ValidateWorkspaceName="@this.ValidateWorkspaceName"/>
+                                                @bind-ToolIds="@this.toolIds"/>
                     </MudPaper>
                 </MudForm>
 

app/MindWork AI Studio/Dialogs/DirectChatLauncherSettingsDialog.razor.cs

@@ -152,7 +152,9 @@ public partial class DirectChatLauncherSettingsDialog : MSGComponentBase
 
         //
         // An empty selection means "use the chat defaults" and is left out of the plugin, whereas
-        // the empty GUID explicitly selects no profile or no chat template:
+        // the empty GUID explicitly selects no profile or no chat template. Clearing the workspace
+        // name is a change of its own: the tile then opens a disappearing chat, and the writer
+        // switches the launch behavior accordingly.
         //
         return new(
             this.workspaceName.Trim(),
@@ -248,8 +250,6 @@ public partial class DirectChatLauncherSettingsDialog : MSGComponentBase
 
     private string? ValidateDescription(string value) => string.IsNullOrWhiteSpace(value) ? T("Please provide a description for this tile.") : null;
 
-    private string? ValidateWorkspaceName(string value) => string.IsNullOrWhiteSpace(value) ? T("Please select or enter a workspace name for this tile.") : null;
-
     private void Cancel() => this.MudDialog.Cancel();
 
     private static Guid? ParseOptionalGuid(string value) => Guid.TryParse(value, out var parsed) ? parsed : null;