fix: /admin redirect loses port behind tunnel/proxy (absolute_redirect off, trailing slash in footer link)

deploy/nginx.conf

@@ -8,6 +8,10 @@ server {
   root /srv/releases/current;
   charset utf-8;
   error_page 404 /404.html;    # Astro emits 404.html at the site root
+  # Directory redirects (/admin -> /admin/) must stay relative: an absolute
+  # redirect is built from listen port 80 and loses the real port whenever the
+  # site is reached through a tunnel or a proxy on a non-default port.
+  absolute_redirect off;
 
   # Fingerprinted build assets (/_astro/<name>.<hash>.*) — immutable
   location /_astro/ {

src/layouts/Base.astro

@@ -169,7 +169,7 @@ const links = [
           <a>Site settings</a>
           {/* Internal tooling stays out of the main nav (NN/g: navigation reflects
               user tasks); the editor is a discreet utility link for the demo. */}
-          <a href="/admin">Content editor</a>
+          <a href="/admin/">Content editor</a>
         </nav>
         <div class="foot-note">
           {/* The real brand flash — path taken from the official logo SVG (BRAND D.4).