Fix: Make example questions clickable and populate input field

- Fixed example question buttons to properly populate the text input field
- Improved session state management for question input
- Clear input field after successful answer generation
- Reduced flickering by removing unnecessary reruns

app.py

@@ -394,15 +394,18 @@ def main():
         st.header("💬 Ask Your Question")
         
         # Question input with better state management
-        default_question = ''
+        # Initialize question input key if it doesn't exist
+        if 'question_input' not in st.session_state:
+            st.session_state.question_input = ''
+            
+        # Handle selected question from examples
         if 'selected_question' in st.session_state:
-            default_question = st.session_state['selected_question']
-            # Clear after getting the value to prevent re-triggering
+            st.session_state.question_input = st.session_state['selected_question']
+            # Clear after setting to prevent re-triggering
             del st.session_state['selected_question']
             
         user_question = st.text_input(
             "Enter your question about Scikit-learn:",
-            value=default_question,
             placeholder="e.g., How do I perform cross-validation in scikit-learn?",
             key="question_input"
         )
@@ -428,7 +431,10 @@ def main():
                         'sources': sources
                     })
                     
-                    # Success message instead of rerun to prevent flickering
+                    # Clear the input field after successful submission
+                    st.session_state.question_input = ""
+                    
+                    # Success message
                     st.success("✅ Answer generated successfully! Check the chat history below.")
         
         # Display chat history