Align the prompt refinement action with the assistant button pattern

app/MindWork AI Studio/Assistants/PromptOptimizer/AssistantPromptOptimizer.razor.cs

@@ -104,10 +104,11 @@ public partial class AssistantPromptOptimizer : AssistantBaseCore<SettingsDialog
         new ButtonData
         {
             Text = T("Improve further"),
+            Tooltip = T("Moves the optimized prompt into the prompt field so you can optimize it again."),
             Icon = Icons.Material.Filled.Input,
             Color = Color.Default,
             AsyncAction = this.UseOptimizedPromptAsInput,
-            DisabledActionParam = () => string.IsNullOrWhiteSpace(this.optimizedPrompt),
+            DisabledActionParam = () => !this.CanImproveFurther,
         },
         new SendToButton
         {
@@ -253,6 +254,7 @@ public partial class AssistantPromptOptimizer : AssistantBaseCore<SettingsDialog
 
     private bool ShowUpdatedPromptGuidelinesIndicator => !this.useCustomPromptGuide && this.hasUpdatedDefaultRecommendations;
     private bool CanPreviewCustomPromptGuide => this.useCustomPromptGuide && this.customPromptGuideFiles.Count > 0;
+    private bool CanImproveFurther => !this.IsProcessing && !string.IsNullOrWhiteSpace(this.optimizedPrompt);
     private string CustomPromptGuideFileName => this.customPromptGuideFiles.Count switch
     {
         0 => T("No file selected"),
@@ -472,9 +474,18 @@ public partial class AssistantPromptOptimizer : AssistantBaseCore<SettingsDialog
         this.optimizedPrompt = string.Empty;
     }
 
+    /// <summary>
+    /// Moves the optimized prompt into the input field so the user can optimize it once more.
+    /// </summary>
+    /// <remarks>
+    /// The finished run is dropped along the way. Keeping it would append the next optimization to
+    /// the chat thread of the previous one, and the earlier proposal would stay on screen next to
+    /// the prompt it was already turned into. The recommendations and every selection stay as they
+    /// are, though: they are what the user works with while refining the prompt.
+    /// </remarks>
     private Task UseOptimizedPromptAsInput()
     {
-        if (string.IsNullOrWhiteSpace(this.optimizedPrompt))
+        if (!this.CanImproveFurther)
             return Task.CompletedTask;
 
         this.inputPrompt = this.optimizedPrompt;