minor interface updates

app.py

@@ -298,7 +298,7 @@ with gr.Blocks() as demo:
             example_button = gr.Button("Use Example Abstract (https://arxiv.org/abs/2510.18061)")
             
             btn = gr.Button("Submit", variant="primary")
-            gr.Markdown("Note: Hover your mouse over the node/edge for more details.")
+            gr.Markdown("Note: Click a node to highlight it and its connections; other nodes/edges are dimmed.")
             
         with gr.Column(scale=1.2):
             output_html = gr.HTML(label="Knowledge Graph Visualization")