feat(auth): wiki/activity access flags, SESSION_DOMAIN, wiki nav link

site/src/layouts/Base.astro

@@ -9,7 +9,8 @@ interface Props {
   public?: boolean;
 }
 const { title = 'BincioActivity', description = 'Your personal activity stats', public: isPublicPage = false } = Astro.props;
-const editUrl = import.meta.env.PUBLIC_EDIT_URL ?? '';
+const editUrl   = import.meta.env.PUBLIC_EDIT_URL  ?? '';
+const wikiUrl   = import.meta.env.PUBLIC_WIKI_URL  ?? '';
 // Edit UI is enabled when PUBLIC_EDIT_URL is set (single-user bincio-edit mode)
 // OR when PUBLIC_EDIT_ENABLED=true (multi-user VPS mode — API proxied at /api/).
 const editEnabled = editUrl !== '' || import.meta.env.PUBLIC_EDIT_ENABLED === 'true';
@@ -217,6 +218,10 @@ try {
             <a href={`${baseUrl}convert/`} class="text-sm text-zinc-400 hover:text-white transition-colors shrink-0">Convert</a>
           )}
           <a id="nav-about" href={`${baseUrl}about/`} class="text-sm text-zinc-400 hover:text-white transition-colors shrink-0">About</a>
+          {wikiUrl && (
+            <a id="nav-wiki" href={wikiUrl} style="display:none"
+              class="text-sm text-zinc-400 hover:text-white transition-colors shrink-0">Wiki</a>
+          )}
         </div>
       )}
 
@@ -561,6 +566,12 @@ try {
             }
           } catch (_) {}
 
+          // Wiki link: show only for users who have wiki access
+          if (user.wiki_access) {
+            const wikiEl = document.getElementById('nav-wiki');
+            if (wikiEl) wikiEl.style.display = '';
+          }
+
           // Admin: show admin link and poll for active jobs
           if (user.is_admin) {
             const adminLink = document.getElementById('nav-admin');