update streamlit to have demand data validation

app.py

@@ -25,7 +25,7 @@ st.sidebar.markdown("---")
 # Navigation
 page = st.sidebar.selectbox(
     "Navigate to:",
-    ["⚙️ Settings", "📊 Optimization Results"],
+    ["⚙️ Settings", "📊 Optimization Results", "📋 Demand Validation"],
     index=0
 )
 
@@ -40,5 +40,37 @@ if page == "⚙️ Settings":
     render_config_page()
 
 elif page == "📊 Optimization Results":
-    st.title("📊 Optimization Results")
-    st.info("🚧 Optimization results page is under development. Please use the Settings page to configure your optimization parameters.")
+    # Import and render the optimization results page
+    from optimization_results import display_optimization_results
+    
+    # Check if we have results in session state
+    if 'optimization_results' in st.session_state and st.session_state.optimization_results:
+        display_optimization_results(st.session_state.optimization_results)
+    else:
+        st.title("📊 Optimization Results")
+        st.info("🔄 No optimization results available yet.")
+        st.markdown("Please run an optimization from the **⚙️ Settings** page first to see results here.")
+        
+        # Add helpful instructions
+        st.markdown("### 📋 How to Get Results:")
+        st.markdown("1. Go to **⚙️ Settings** page")
+        st.markdown("2. Configure your optimization parameters")
+        st.markdown("3. Click **🚀 Optimize Schedule**")
+        st.markdown("4. Return here to view detailed results and input data inspection")
+
+elif page == "📋 Demand Validation":
+    # Import and render the demand validation page
+    try:
+        from src.demand_validation import display_demand_validation
+        
+        st.title("📋 Demand Data Validation")
+        st.markdown("---")
+        
+        display_demand_validation()
+        
+    except ImportError as e:
+        st.error(f"❌ Error loading demand validation module: {str(e)}")
+        st.info("💡 Please ensure the demand validation module is properly installed.")
+    except Exception as e:
+        st.error(f"❌ Error in demand validation: {str(e)}")
+        st.info("💡 Please check the data files and configuration.")