feat: align comments redesign with new partials structure

- Re-applied redesign to new partial templates (_comment.html, _reply.html, etc.)
- Preserved HTMX and reactions functionality from v2 update
- Improved spacing and typography across all comment components
- Verified all E2E tests pass with new structure

templates/comments/_comment.html

@@ -1,26 +1,42 @@
-<article id="comment-{{ comment.id }}" class="bg-brand-surfaceLight dark:bg-brand-surfaceDark border border-zinc-200 dark:border-zinc-800 p-6 hover:shadow-solid-dark dark:hover:shadow-solid-light transition-all duration-300">
-  <div class="flex items-center gap-3 mb-3">
-    <div class="w-10 h-10 bg-gradient-to-tr from-brand-cyan to-brand-pink shrink-0 shadow-neon-cyan"></div>
-    <div>
-      <div class="font-display font-bold text-sm hover:text-brand-cyan transition-colors">{{ comment.author_name }}</div>
-      <div class="font-mono text-xs text-zinc-500">{{ comment.created_at|date:"M j, Y" }}</div>
-    </div>
-  </div>
-  <p class="text-zinc-700 dark:text-zinc-300 text-sm leading-relaxed">{{ comment.body }}</p>
-  {% include "comments/_reactions.html" with comment=comment counts=comment.reaction_counts user_reacted=comment.user_reacted %}
-  <div class="replies-container">
-  {% for reply in comment.replies.all %}
-  <article id="comment-{{ reply.id }}" class="mt-6 ml-8 bg-zinc-50 dark:bg-zinc-900 border border-zinc-200 dark:border-zinc-800 border-l-2 border-l-brand-cyan p-4">
-    <div class="flex items-center gap-3 mb-2">
-      <div class="w-7 h-7 bg-gradient-to-tr from-brand-pink to-brand-cyan shrink-0"></div>
-      <div>
-        <div class="font-display font-bold text-sm">{{ reply.author_name }}</div>
-        <div class="font-mono text-xs text-zinc-500">{{ reply.created_at|date:"M j, Y" }}</div>
+<div class="group">
+  <!-- Top-level Comment -->
+  <article id="comment-{{ comment.id }}" class="relative bg-brand-surfaceLight dark:bg-brand-surfaceDark border border-zinc-200 dark:border-zinc-800 p-6 sm:p-8 hover:border-brand-pink/30 transition-colors">
+    <div class="flex items-start gap-4 mb-4">
+      <div class="w-10 h-10 bg-gradient-to-tr from-brand-cyan to-brand-pink shrink-0 rounded-sm shadow-solid-dark/10 dark:shadow-solid-light/5"></div>
+      <div class="flex-1 min-w-0">
+        <div class="flex flex-wrap items-baseline gap-x-3 gap-y-1">
+          <span class="font-display font-bold text-base text-zinc-900 dark:text-zinc-100">{{ comment.author_name }}</span>
+          <time datetime="{{ comment.created_at|date:'c' }}" class="font-mono text-xs text-zinc-500 uppercase tracking-wider">{{ comment.created_at|date:"M j, Y" }}</time>
+        </div>
+        <div class="mt-3 prose prose-sm dark:prose-invert max-w-none text-zinc-700 dark:text-zinc-300 leading-relaxed">
+          {{ comment.body|linebreaks }}
+        </div>
       </div>
     </div>
-    <p class="text-zinc-700 dark:text-zinc-300 text-sm leading-relaxed">{{ reply.body }}</p>
+
+    <div class="flex items-center justify-between mt-6">
+      {% include "comments/_reactions.html" with comment=comment counts=comment.reaction_counts user_reacted=comment.user_reacted %}
+      
+      <details class="group/details">
+        <summary class="list-none cursor-pointer flex items-center gap-2 font-mono text-xs font-bold uppercase tracking-widest text-zinc-500 hover:text-brand-pink transition-colors [&::-webkit-details-marker]:hidden">
+          <svg class="w-4 h-4 transition-transform group-open/details:-translate-y-0.5 group-open/details:translate-x-0.5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3 10h10a8 8 0 018 8v2M3 10l6 6m-6-6l6-6" />
+          </svg>
+          <span class="group-open/details:hidden">Reply</span>
+          <span class="hidden group-open/details:inline text-brand-pink">Cancel Reply</span>
+        </summary>
+
+        <div class="mt-8 pt-8 border-t border-zinc-100 dark:border-zinc-800 animate-in fade-in slide-in-from-top-2 duration-300">
+          {% include "comments/_reply_form.html" with page=page comment=comment %}
+        </div>
+      </details>
+    </div>
   </article>
-  {% endfor %}
+
+  <!-- Nested Replies -->
+  <div class="replies-container relative ml-6 sm:ml-12 mt-4 space-y-4 pl-6 sm:pl-8 border-l-2 border-zinc-100 dark:border-zinc-800">
+    {% for reply in comment.replies.all %}
+      {% include "comments/_reply.html" with reply=reply %}
+    {% endfor %}
   </div>
-  {% include "comments/_reply_form.html" with page=page comment=comment %}
-</article>
+</div>