Fix Gradio API schema bug by replacing gr.File with gr.DownloadButton

- Replace gr.File with gr.DownloadButton to avoid API schema generation bug
- Restructure download logic to work with DownloadButton

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/settings.local.json

@@ -5,7 +5,8 @@
       "Bash(git add:*)",
       "Bash(git remote add:*)",
       "Bash(git push:*)",
-      "Bash(git branch:*)"
+      "Bash(git branch:*)",
+      "Bash(git commit -m \"$\\(cat <<''EOF''\nFix Gradio compatibility for HuggingFace Spaces\n\n- Upgrade gradio to >=5.0.0 to fix API schema bug\n- Add server_name and server_port to demo.launch\\(\\)\n\nCo-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>\nEOF\n\\)\")"
     ]
   }
 }

app.py

@@ -243,19 +243,13 @@ def run_evaluation(text: str, progress=gr.Progress()):
         # Wrap HTML for iframe display
         wrapped_html = wrap_html_in_iframe(html)
 
-        # Save HTML for download
-        temp_file = tempfile.NamedTemporaryFile(
-            mode='w',
-            suffix='.html',
-            delete=False,
-            encoding='utf-8'
-        )
-        temp_file.write(html)
-        temp_file.close()
+        # Store HTML for download
+        global _last_html_content
+        _last_html_content = html
 
         progress(1.0, desc="Done!")
 
-        return wrapped_html, temp_file.name
+        return wrapped_html
 
     except torch.cuda.OutOfMemoryError:
         if torch.cuda.is_available():
@@ -275,7 +269,11 @@ def run_evaluation(text: str, progress=gr.Progress()):
 
 def clear_inputs():
     """Clear all inputs and outputs."""
-    return "", None, None
+    return "", None
+
+
+# Global variable to store the last generated HTML for download
+_last_html_content = None
 
 
 # Build Gradio UI
@@ -322,7 +320,7 @@ with gr.Blocks(
     with gr.Row():
         with gr.Column():
             output_html = gr.HTML(label="Visualization")
-            download_file = gr.File(label="Download HTML", visible=True)
+            download_btn = gr.DownloadButton("📥 Download HTML", visible=True)
 
     # Event handlers
     news_btn.click(fn=lambda: EXAMPLE_NEWS, outputs=[text_input])
@@ -331,13 +329,29 @@ with gr.Blocks(
 
     clear_btn.click(
         fn=clear_inputs,
-        outputs=[text_input, output_html, download_file]
+        outputs=[text_input, output_html]
     )
 
+    def run_and_prepare_download(text, progress=gr.Progress()):
+        """Run evaluation and prepare download file."""
+        wrapped_html = run_evaluation(text, progress)
+
+        # Save HTML for download
+        temp_file = tempfile.NamedTemporaryFile(
+            mode='w',
+            suffix='.html',
+            delete=False,
+            encoding='utf-8'
+        )
+        temp_file.write(_last_html_content)
+        temp_file.close()
+
+        return wrapped_html, temp_file.name
+
     run_btn.click(
-        fn=run_evaluation,
+        fn=run_and_prepare_download,
         inputs=[text_input],
-        outputs=[output_html, download_file]
+        outputs=[output_html, download_btn]
     )
 
     gr.Markdown("""