Fix Gradio compatibility: Downgrade to 4.43.0, simplify interface, fix Hugging Face Spaces deployment

app.py

@@ -291,14 +291,14 @@ with gr.Blocks(css=css, title="Research Draft Generator") as demo:
     session = gr.State({})
 
     # Wire actions
-    # Left preview shows outline initially; right preview mirrors it. After approval, both show draft (right replaces outline visually)
-    def mirror_left_to_right(md):
-        return gr.update(visible=md["visible"], value=md["value"]) if isinstance(md, dict) else md
-
     def toggle_feedback_controls(state):
-        enabled = bool(state and state.get("thread_id"))
-        upd = gr.update(interactive=enabled)
-        return upd, upd, upd, upd
+        try:
+            enabled = bool(state and state.get("thread_id"))
+            upd = gr.update(interactive=enabled)
+            return upd, upd, upd, upd
+        except:
+            # Fallback if state is corrupted
+            return gr.update(interactive=False), gr.update(interactive=False), gr.update(interactive=False), gr.update(interactive=False)
 
     start_btn.click(run_workflow, inputs=[topic], outputs=[info, session, right_preview, pdf_file, right_header]).then(
         toggle_feedback_controls, inputs=[session], outputs=[feedback, approve, revise, reject]
@@ -314,6 +314,10 @@ with gr.Blocks(css=css, title="Research Draft Generator") as demo:
     )
 
 
-if __name__ == "__main__":
-    port = int(os.getenv("PORT", 7860))
-    demo.queue().launch(server_name="0.0.0.0", server_port=port)
+# Launch the app for Hugging Face Spaces
+port = int(os.getenv("PORT", 7860))
+demo.launch(
+    server_name="0.0.0.0",
+    server_port=port,
+    show_error=True
+)

requirements.txt

@@ -1,4 +1,4 @@
-gradio==5.43.1
+gradio==4.43.0
 transformers
 torch
 numpy