update gradio to 5.42.0 and fix export conversation functionality

- updated gradio requirement from 5.39.0 to 5.42.0 in both requirements.txt and deployment packages
- fixed export conversation not working on first click by passing chatbot state directly
- fixed clear button to properly reset chat history store
- removed tts integration guide file and all tts-related references

.gitignore

@@ -59,4 +59,5 @@ test_complete_system.py
 test_grounding.py
 
 # Markdown files
-tts_integration_guide.md
+tts_integration_guide.md
+stem_adventure_games_conversation_20250813_215243.md

app.py

@@ -9,6 +9,8 @@ import zipfile
 import io
 import os
 import requests
+import re
+import tempfile
 from datetime import datetime
 from dotenv import load_dotenv
 from pathlib import Path
@@ -647,11 +649,27 @@ class SpaceGenerator:
                 clear_btn.click(lambda: ([], ""), outputs=[preview_chatbot, msg])
                 
                 # Export handler
-                def prepare_export():
-                    return None  # Simplified for preview
+                def prepare_export(chat_history):
+                    if not chat_history:
+                        return None
+                    
+                    # Export conversation
+                    content = export_conversation_to_markdown(chat_history)
+                    
+                    # Create filename
+                    space_name_safe = re.sub(r'[^a-zA-Z0-9]+', '_', config.get('name', 'AI_Assistant')).lower()
+                    timestamp = datetime.now().strftime('%Y%m%d_%H%M%S')
+                    filename = f"{space_name_safe}_conversation_{timestamp}.md"
+                    
+                    # Save to temp file
+                    temp_path = Path(tempfile.gettempdir()) / filename
+                    temp_path.write_text(content, encoding='utf-8')
+                    
+                    return str(temp_path)
                 
                 export_btn.click(
                     prepare_export,
+                    inputs=[preview_chatbot],
                     outputs=[export_btn]
                 )
     
@@ -925,7 +943,7 @@ class SpaceGenerator:
             template = get_template()
             app_content = template.format(**config)
             
-            requirements_content = """gradio>=5.39.0
+            requirements_content = """gradio>=5.42.0
 requests>=2.32.3
 beautifulsoup4>=4.12.3
 python-dotenv>=1.0.0
@@ -1043,7 +1061,7 @@ emoji: {emoji}
 colorFrom: blue
 colorTo: green
 sdk: gradio
-sdk_version: 5.39.0
+sdk_version: 5.42.0
 app_file: app.py
 pinned: false
 license: mit

space_template.py

@@ -596,11 +596,11 @@ def create_interface():
                         )
                     
                     # Export handler
-                    def prepare_export():
-                        if not chat_history_store:
+                    def prepare_export(chat_history):
+                        if not chat_history:
                             return None
                         
-                        content = export_conversation_to_markdown(chat_history_store)
+                        content = export_conversation_to_markdown(chat_history)
                         
                         # Create filename
                         space_name_safe = re.sub(r'[^a-zA-Z0-9]+', '_', SPACE_NAME).lower()
@@ -615,6 +615,7 @@ def create_interface():
                     
                     export_btn.click(
                         prepare_export,
+                        inputs=[chatbot],
                         outputs=[export_btn]
                     )
                     
@@ -654,7 +655,13 @@ def create_interface():
                     # Wire up the interface
                     msg.submit(respond, [msg, chatbot, uploaded_files, access_granted], [chatbot, msg, access_granted])
                     submit_btn.click(respond, [msg, chatbot, uploaded_files, access_granted], [chatbot, msg, access_granted])
-                    clear_btn.click(lambda: ([], ""), outputs=[chatbot, msg])
+                    
+                    def clear_chat():
+                        global chat_history_store
+                        chat_history_store = []
+                        return [], ""
+                    
+                    clear_btn.click(clear_chat, outputs=[chatbot, msg])
                     
                     # File upload accordion
                     if ENABLE_FILE_UPLOAD: