Force deployment refresh to show updated questions

- Minor comment change to trigger HuggingFace space restart
- Questions should now be visible: 15 sample questions including harder analytical ones
- If questions still don't show, may need manual space restart

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

Co-Authored-By: Claude <[email protected]>

app.py

@@ -609,7 +609,7 @@ with st.sidebar:
             "Find correlation between PM2.5 and PM10 across different seasons and cities"
         ]
     
-    # Quick query buttons in sidebar with helpful descriptions
+    # Quick query buttons in sidebar
     selected_prompt = None