fix: add transition-colors to Directory heading per review feedback

Agent-Logs-Url: https://github.com/NextCommunity/NextCommunity.github.io/sessions/1d382a16-63f3-4334-8aed-690b06dd8f72

Co-authored-by: jbampton <418747+jbampton@users.noreply.github.com>

Author: Copilot

src/_includes/header-details.njk

@@ -8,7 +8,7 @@
     {% else %}
       <a href="/" class="group/back flex items-center gap-3">
         <span class="text-2xl md:text-4xl text-accent transition-transform group-hover/back:-translate-x-2">←</span>
-        <h1 class="text-3xl md:text-5xl font-black tracking-tighter text-accent uppercase italic leading-none">
+        <h1 class="text-3xl md:text-5xl font-black tracking-tighter text-accent uppercase italic leading-none transition-colors">
           Directory
         </h1>
       </a>