{%- comment -%} static-design-system — nav.html Data-driven top navigation + mobile menu (chrome). Place inside a .shell. Links come from site.data.nav (a list of { title, url }). An RSS link is shown only if site.rss_url is set. The theme toggle and hamburger are always present; behavior is wired by /assets/ds.js (ds/theme-toggle.js). {%- endcomment -%}