Update subtitle to emphasize research-grade accuracy

app.py

@@ -671,7 +671,7 @@ with col_logo:
     st.image("logo.png", width=100)
 with col_title:
     st.title("CatLLM - Research Data Classifier")
-    st.markdown("Assign categories to survey responses, PDFs, and images using LLMs.")
+    st.markdown("Research-grade categorization of survey responses, PDFs, and images using LLMs.")
 
 # About section
 with st.expander("About This App"):