Update app.py

app.py

@@ -3,19 +3,16 @@
 import streamlit as st
 import os
 from pathlib import Path
+from typing import List, Dict, Optional
+from datetime import datetime
+from threading import Lock
+
+# Components imports
 from components.chat import display_chat_interface
-from utils.database import (
-    create_connection,
-    create_tables,
-    handle_document_upload,
-    verify_vector_store
-)
-from utils.collections import (
-    create_collection_tables,
-    get_collections,
-    get_collection_documents,
-    create_collection,
-    add_document_to_collection
+from components.document_preview import enhanced_document_preview
+from components.collection_manager import (
+    display_enhanced_collections,
+    display_collection_content
 )
 import time
 from threading import Lock