Fixed and improved the system prompt of chats started from assistants (#1172)

app/MindWork AI Studio/Assistants/BatchProcessing/AssistantBatchProcessing.razor.cs

@@ -56,6 +56,9 @@ public partial class AssistantBatchProcessing : AssistantBaseCore<SettingsDialog
 
     protected override string Description => T("Process all documents and media files of a folder in one batch run: documents are converted to Markdown, while audio and video files are transcribed automatically, before their content is sent to the AI along with your instructions. You choose whether each answer is stored as its own Markdown file or whether all answers are collected in one CSV results table. A log records what happened to every file, so a run which was interrupted or produced errors can be continued later. A single failing file never stops the entire run.");
 
+    // The results of this assistant go into files, so no chat continues its conversations:
+    protected override ChatSystemPromptChoice ChatSystemPrompt => ChatSystemPromptChoice.AI_STUDIO_DEFAULT;
+
     protected override string SystemPrompt => this.BuildSystemPrompt();
 
     protected override string SubmitText => T("Start batch processing");