fix: update preview chatbot to use gradio 5.x message format

app.py

@@ -91,11 +91,11 @@ class SpaceGenerator:
                 self.main_tabs = main_tabs  # Store reference for tab switching
                 
                 # Configuration Tab
-                with gr.Tab("📋 Configuration"):
+                with gr.Tab("Configuration"):
                     self._create_configuration_tab()
                 
                 # Preview Tab
-                with gr.Tab("👁️ Preview"):
+                with gr.Tab("Preview"):
                     self._create_preview_tab()
                 
                 # Documentation Tab
@@ -442,7 +442,7 @@ class SpaceGenerator:
                         label=config.get('name', 'AI Assistant'),
                         height=400,
                         show_copy_button=True,
-                        bubble_full_width=False
+                        type='messages'
                     )
                     
                     # Example buttons