feat: Convert application from Gradio to Streamlit

ui.py

@@ -8,21 +8,24 @@ from ui_hybrid_matching import categorize_products_with_voyage_reranking
 from ui_expanded_matching import categorize_products_with_openai_reranking
 # Removed unused import: from ui_formatters import format_results_html
 
-# Initialize session state keys if they don't exist
-if 'ingredient_input' not in st.session_state:
-    st.session_state.ingredient_input = ""
-if 'category_input' not in st.session_state:
-    st.session_state.category_input = ""
-if 'voyage_input' not in st.session_state:
-    st.session_state.voyage_input = ""
-if 'openai_input' not in st.session_state:
-    st.session_state.openai_input = ""
-if 'compare_input' not in st.session_state:
-    st.session_state.compare_input = ""
+# Session state initialization moved into render_ui()
 
 
 def render_ui():
     """Render the Streamlit interface"""
+
+    # Initialize session state keys if they don't exist at the start of rendering
+    if 'ingredient_input' not in st.session_state:
+        st.session_state.ingredient_input = ""
+    if 'category_input' not in st.session_state:
+        st.session_state.category_input = ""
+    if 'voyage_input' not in st.session_state:
+        st.session_state.voyage_input = ""
+    if 'openai_input' not in st.session_state:
+        st.session_state.openai_input = ""
+    if 'compare_input' not in st.session_state:
+        st.session_state.compare_input = ""
+
     # Page config is now set in app.py
     st.title("Product Categorization Tool")
     st.markdown("Analyze products by matching to ingredients or categories using AI embeddings.")