fix: render parse table with st.table (HF proxy blanks st.dataframe)

The interactive st.dataframe grid produces data server-side (confirmed via
AppTest and the clean run log — no crash on Analyze) but its JS component
silently fails to paint behind HF Spaces' proxy, leaving the demo stuck on
the summary line. st.table is plain HTML and always renders.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

pages/1_parsing_demo.py

@@ -89,7 +89,11 @@ with tab1:
         df = analyze_text(text)
         sent_count = df["sent_id"].nunique()
         st.text(f"Analyzed {len(df)} tokens in {sent_count} sentences with {model_name} model.")
-        st.dataframe(df, width=1200, hide_index=True)
+        # Static HTML table (st.table) instead of the interactive st.dataframe:
+        # the dataframe's JS grid silently fails to paint behind HF Spaces'
+        # proxy (renders blank after the summary line), while a plain HTML
+        # table always renders. Index hidden for a clean CoNLL-U-style view.
+        st.table(df.style.hide(axis="index"))
 
         @st.cache_data
         def convert_df(df):