Upload app.py

src/app.py

@@ -589,6 +589,8 @@ def pyvis_from_kg(nodes_df, edges_df, height="780px"):
 st.title("CitationHub")
 st.caption("Explore influential papers (top 5% cited), their citation networks, and knowledge graphs.")
 
+_loading_placeholder = st.empty()
+
 with st.sidebar:
     st.subheader("Data source")
     if HF_REPO_ID:
@@ -598,9 +600,12 @@ with st.sidebar:
         data_dir_val = st.text_input("Parquet directory", str(DEFAULT_DATA_DIR))
 
     try:
+        _loading_placeholder.info("⏳ Loading CitationHub data… this may take a moment on first visit.")
         seed, events, citing, filters, overview = load_data(data_dir_val)
+        _loading_placeholder.empty()
         st.success("Data loaded")
     except Exception as e:
+        _loading_placeholder.empty()
         st.error(str(e)); st.stop()
 
     st.subheader("Search seed papers")