feat: add prev/next article navigation with shell prompt style

Add top and bottom navigation between sequential articles with hacker aesthetic:
- Top nav: [visitor@danix.xyz articles]$ cd
- Bottom nav: [visitor@danix.xyz articles]$ ls ../
- Missing link shows dimmed placeholder (beginning/end)
- Only renders on articles, not static pages
- New partial: article-nav.html
- Styling: monospace prompt in accent color, hover links with transition

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/themes/danix-xyz-hacker/layouts/_default/single.html b/themes/danix-xyz-hacker/layouts/_default/single.html
index 0d3c6fa..62e4a64 100644
--- a/themes/danix-xyz-hacker/layouts/_default/single.html
+++ b/themes/danix-xyz-hacker/layouts/_default/single.html
@@ -3,6 +3,11 @@
   <div class="grid md:grid-cols-3 gap-8 max-w-7xl mx-auto content-grid">
     <!-- Article section -->
     <div class="md:col-span-2">
+      <!-- Top article navigation (articles only) -->
+      {{ if eq .Section "articles" }}
+      {{ partial "article-nav.html" (dict "page" . "variant" "top") }}
+      {{ end }}
+
       <!-- Breadcrumb -->
       {{ partial "breadcrumb.html" . }}
 
@@ -35,6 +40,11 @@
         </div>
       </div>
       {{ end }}
+
+      <!-- Bottom article navigation (articles only) -->
+      {{ if eq .Section "articles" }}
+      {{ partial "article-nav.html" (dict "page" . "variant" "bottom") }}
+      {{ end }}
     </div>
 
     <!-- Sidebar -->