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>

3 files changed, 62 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 -->
diff --git a/themes/danix-xyz-hacker/layouts/articles/single.html b/themes/danix-xyz-hacker/layouts/articles/single.html
index 4e97fb3..e646639 100644
--- a/themes/danix-xyz-hacker/layouts/articles/single.html
+++ b/themes/danix-xyz-hacker/layouts/articles/single.html
@@ -5,6 +5,9 @@
   <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 -->
+      {{ partial "article-nav.html" (dict "page" . "variant" "top") }}
+
       <!-- Breadcrumb -->
       {{ partial "breadcrumb.html" . }}
 
@@ -35,6 +38,9 @@
         </div>
       </div>
       {{ end }}
+
+      <!-- Bottom article navigation -->
+      {{ partial "article-nav.html" (dict "page" . "variant" "bottom") }}
     </div>
 
     <!-- Sidebar -->
diff --git a/themes/danix-xyz-hacker/layouts/partials/article-nav.html b/themes/danix-xyz-hacker/layouts/partials/article-nav.html
new file mode 100644
index 0000000..d7f8ca3
--- /dev/null
+++ b/themes/danix-xyz-hacker/layouts/partials/article-nav.html
@@ -0,0 +1,46 @@
+{{ $page    := .page }}
+{{ $variant := .variant | default "bottom" }}
+{{ $prev := $page.PrevInSection }}
+{{ $next := $page.NextInSection }}
+
+{{/* Shell prompt command varies by position */}}
+{{ $cmd := "ls ../" }}
+{{ if eq $variant "top" }}
+  {{ $cmd = "cd" }}
+{{ end }}
+
+<nav class="article-nav {{ if eq $variant "bottom" }}mt-8{{ else }}mb-8{{ end }}"
+     aria-label="Article navigation">
+  <p class="article-nav-prompt" aria-hidden="true">
+    [visitor@danix.xyz articles]$ {{ $cmd }}
+  </p>
+  <div class="article-nav-links">
+    {{/* ---- Previous (left side) ---- */}}
+    {{ if $prev }}
+      <a href="{{ $prev.Permalink }}"
+         class="article-nav-link truncate max-w-[45%]"
+         rel="prev"
+         title="{{ $prev.Title }}">
+        ◄ {{ $prev.Title }}
+      </a>
+    {{ else }}
+      <span class="article-nav-placeholder" aria-label="Beginning of articles">
+        ◄ (beginning)
+      </span>
+    {{ end }}
+
+    {{/* ---- Next (right side) ---- */}}
+    {{ if $next }}
+      <a href="{{ $next.Permalink }}"
+         class="article-nav-link truncate max-w-[45%] text-right"
+         rel="next"
+         title="{{ $next.Title }}">
+        {{ $next.Title }} ►
+      </a>
+    {{ else }}
+      <span class="article-nav-placeholder text-right" aria-label="End of articles">
+        (end) ►
+      </span>
+    {{ end }}
+  </div>
+</nav>