Fix undefined variables and Gradio 6.0 compatibility

app.py

@@ -603,7 +603,7 @@ function triggerRouteSwap(idx) {
 """
 
 # ── Gradio layout ─────────────────────────────────────────────────────────────
-with gr.Blocks(css=CSS, head=HEAD, theme=gr.themes.Base(), fill_height=True) as demo:
+with gr.Blocks(fill_height=True) as demo:
 
     # ── Shared state ──────────────────────────────────────────────────────────
     papers_state        = gr.State([])
@@ -726,7 +726,7 @@ with gr.Blocks(css=CSS, head=HEAD, theme=gr.themes.Base(), fill_height=True) as
                     parse_panel    = gr.HTML('<div class="panel" style="padding:18px"><p>No parsed document yet.</p></div>')
                     ingest_summary = gr.Markdown("### Graph ingest status\n\nAwaiting paper selection.")
                     ingest_payload = gr.JSON(label="Graph ingest payload", value={"status": "empty", "nodes": [], "edges": []})
-                    graph_html = render_graph_canvas_html({"status": "ok", "nodes": graph_nodes, "edges": graph_edges},title="Some title",height=780,)
+                    graph_html = render_graph_canvas_html({"status": "ok", "nodes": NODES, "edges": EDGES},title="Some title",height=780,)
     # ── Event wiring ──────────────────────────────────────────────────────────
     example_btn.click(fn=load_example, outputs=query)
 
@@ -767,4 +767,4 @@ with gr.Blocks(css=CSS, head=HEAD, theme=gr.themes.Base(), fill_height=True) as
     )
 
 if __name__ == "__main__":
-    demo.launch()
+    demo.launch(css=CSS, head=HEAD, theme=gr.themes.Base())