Fix settings cog URL: /settings/ not /admin/

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

shared/sexp/helpers.py

@@ -35,7 +35,7 @@ def root_header_html(ctx: dict, *, oob: bool = False) -> str:
     """Build the root header row HTML."""
     rights = ctx.get("rights") or {}
     is_admin = rights.get("admin") if isinstance(rights, dict) else getattr(rights, "admin", False)
-    settings_url = call_url(ctx, "blog_url", "/admin/") if is_admin else ""
+    settings_url = call_url(ctx, "blog_url", "/settings/") if is_admin else ""
     return render(
         "header-row",
         cart_mini_html=ctx.get("cart_mini_html", ""),