fix hf token variable name

app/app.py

@@ -63,8 +63,7 @@ VECTOR_STORE_DIR = ROOT / "data" / "processed"
 @st.cache_resource
 def load_vector_store_cached():
 
-    hf_token = st.secrets["HF_TOKEN"]
-    login(token=hf_token, add_to_git_credential=False)
+    login(token=HF_TOKEN, add_to_git_credential=False)
     VECTOR_STORE_DIR.mkdir(parents=True, exist_ok=True)
 
     # Skip download if already cached on disk
@@ -73,7 +72,7 @@ def load_vector_store_cached():
             repo_id="rishadaz/amazon_retriever-storage",
             repo_type="dataset",
             local_dir=str(VECTOR_STORE_DIR),
-            token=hf_token,
+            token=HF_TOKEN,
         ))
     else:
         snapshot_path = VECTOR_STORE_DIR