fix: Display generated X-ray images in visualization panel

Updated visualization detection to include generated X-ray images alongside
grounding and segmentation outputs. Now all three visualization types are
properly displayed in the UI.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app.py

@@ -261,9 +261,9 @@ def chat(message, history, mode, uploaded_image_path=None):
     # Extract text response
     assistant_message = response["messages"][-1].content
 
-    # Check for visualization images (grounding or segmentation)
+    # Check for visualization images (grounding, segmentation, or generated)
     viz_image = None
-    viz_files = glob.glob("temp/grounding_*.png") + glob.glob("temp/segmentation_*.png")
+    viz_files = glob.glob("temp/grounding_*.png") + glob.glob("temp/segmentation_*.png") + glob.glob("temp/generated_xray_*.png")
     if viz_files:
         # Get the most recent visualization
         viz_files.sort(key=os.path.getmtime, reverse=True)
@@ -278,6 +278,8 @@ def chat(message, history, mode, uploaded_image_path=None):
                     assistant_message = "I've segmented the requested anatomical structures. The visualization is shown on the right."
                 elif "grounding" in latest_viz:
                     assistant_message = "I've highlighted the requested regions. The visualization is shown on the right."
+                elif "generated_xray" in latest_viz:
+                    assistant_message = "I've generated the requested chest X-ray image. The visualization is shown on the right."
     else:
         # No visualization generated - show the uploaded image as reference
         if current_upload: