Update app.py

app.py

@@ -32,6 +32,7 @@ with st.sidebar:
             key="api_key_input"
         )
 
+        # Validate API Key immediately when button is clicked
         if st.button("Validate API Key"):
             if not api_key_input:
                 st.warning("Please enter an API key.")
@@ -41,14 +42,12 @@ with st.sidebar:
                     client = genai.Client(api_key=api_key_input)
 
                     # Attempt to list models (authentication test)
-                    models = []
                     try:
                         models = [
                             m.name for m in client.models.list()
                             if "gemini" in m.name.lower()
                         ]
                     except Exception:
-                        # Listing models may fail even if key is valid
                         models = []
 
                     # Persist validated state
@@ -72,12 +71,14 @@ with st.sidebar:
     else:
         st.success("🔒 API Key validated (hidden)")
 
+        # Model selector is now immediately visible
         st.selectbox(
             "Available Models",
             st.session_state.models,
             key="selected_model"
         )
 
+        # Allow changing API key
         if st.button("🔄 Change API Key"):
             for k in defaults:
                 st.session_state[k] = defaults[k]