Log page registry build errors instead of silently swallowing

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

shared/sx/helpers.py

@@ -758,8 +758,9 @@ def sx_page(ctx: dict, page_sx: str, *,
     try:
         from quart import current_app
         pages_sx = _build_pages_sx(current_app.name)
-    except Exception:
-        pass
+    except Exception as e:
+        import logging
+        logging.getLogger("sx").warning("Failed to build page registry: %s", e)
 
     return _SX_PAGE_TEMPLATE.format(
         title=_html_escape(title),