Fix Gradio 6 compatibility: move head to launch(), disable SSR

- head= parameter moved from gr.Blocks() to launch() in Gradio 6.0;
keeping it in Blocks() raises a UserWarning and may break routing
- ssr_mode=False: SSR is experimental in Gradio 6 and causes
'Could not get API info' connection errors on HuggingFace Spaces

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app.py

@@ -323,7 +323,7 @@ def update_page_selector(file_path):
                         label=f"Select Page (1-{page_count})")
     return gr.update(visible=False)
 
-with gr.Blocks(title="DeepSeek-OCR-2", head=MATHJAX_HEAD) as demo:
+with gr.Blocks(title="DeepSeek-OCR-2") as demo:
     gr.Markdown("""
     # 🧮 DeepSeek-OCR-2 — Math Rendering Edition
     **Convert documents to markdown, extract text, parse figures, and locate specific content with bounding boxes.**
@@ -427,4 +427,9 @@ if __name__ == "__main__":
     # server_name="0.0.0.0" is needed locally (WSL2 → Windows access)
     # On HuggingFace Spaces, SPACE_ID is set and Gradio handles binding automatically
     local = not os.environ.get("SPACE_ID")
-    demo.queue(max_size=20).launch(theme=gr.themes.Soft(), server_name="0.0.0.0" if local else None)
+    demo.queue(max_size=20).launch(
+        theme=gr.themes.Soft(),
+        server_name="0.0.0.0" if local else None,
+        head=MATHJAX_HEAD,   # Gradio 6.0: head moved from Blocks() to launch()
+        ssr_mode=False,      # SSR is experimental in Gradio 6 and breaks HF Spaces routing
+    )