clean up design

app.py

@@ -49,7 +49,9 @@ def postfilters_ok(md_text: str, require_has_table: bool | None, require_has_cod
     return True
 
 def format_for_markdown(text: str) -> str:
-    return text.replace("\n", "\n\n")
+    import re
+    # Replace '\n' not preceded by '|' with '\n\n'
+    return re.sub(r'(?<!\|)\n', '\n\n', text)
 
 def find_next_valid(docs_cache, reader_iter, start_idx: int, require_has_math: bool | None, require_has_infobox: bool | None, require_has_table: bool | None, require_has_code: bool | None):
     # Scan cache first (forward from start_idx)