feat: implement load collection from dotenv in webapp

src/webapp/app.py

@@ -246,7 +246,6 @@ class RagInterface:
                 outputs=result_components,
             )
 
-
         app.launch(ssr_mode=False, **kwargs)
 
 
@@ -276,10 +275,13 @@ def main():
     parser.add_argument("--share", action="store_true", help="Create public link")
     args = parser.parse_args()
 
-    collection = args.collection or os.getenv("CHROMA_COLLECTION_NAME")
+    # Load collection from dotenv if not specified
+    collection = os.getenv("CHROMA_COLLECTION_NAME") or args.collection
 
     # Initialize store
-    store = ChromaSlideStore(collection_name=collection)
+    store = ChromaSlideStore(
+        collection_name=collection
+    )  # pyright: ignore[reportArgumentType]
 
     # Run app
     run_app(store, server_name=args.host, server_port=args.port, share=args.share)