Update app.py

app.py

@@ -143,7 +143,7 @@ def main():
 
     st.sidebar.markdown("---")
     st.sidebar.write("Groq API key (optional - recommended to use env var)")
-    hardcoded_key = st.sidebar.text_input("Paste GROQ key here (will be used if env var not set)", value="")
+    hardcoded_key = st.sidebar.text_input("Paste GROQ key here (will be used if env var not set)", type="password", value="")
 
     with st.spinner("Loading embedding model..."):
         embed_model = load_embedding_model()