fix: nav/footer wireframe, honeypot CSP, explore topics, comment E2E coverage

- Replace nav inline newsletter form with Subscribe CTA link per wireframe
- Remove newsletter form from footer; add Connect section with social/RSS links
- Fix honeypot inputs using hidden attribute (inline style blocked by CSP)
- Add available_tags to HomePage.get_context for Explore Topics section
- Add data-comment-form attribute to main comment form for reliable locating
- Seed approved comment in E2E content for reply flow testing
- Expand test_comments.py: moderation message, not-immediately-visible,
  missing fields, reply form visible, reply submission
- Make COMMENT_RATE_LIMIT_PER_MINUTE configurable; set 100 in dev to prevent
  E2E test exhaustion; update rate limit unit test with override_settings
- Update newsletter/home E2E tests to reflect nav form removal
- Update unit test to assert no nav/footer newsletter forms

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

templates/blog/article_page.html

@@ -178,8 +178,7 @@
         </div>
         <textarea name="body" required placeholder="Write a reply..." rows="2"
           class="w-full bg-transparent border border-zinc-300 dark:border-zinc-700 px-3 py-2 font-mono text-sm focus:outline-none focus:border-brand-pink transition-colors mb-3 resize-none"></textarea>
-        <input type="text" name="honeypot" style="display:none" />
-        <button type="submit" class="px-4 py-2 bg-zinc-200 dark:bg-zinc-800 font-display font-bold text-sm hover:bg-brand-pink hover:text-white transition-colors">Reply</button>
+        <input type="text" name="honeypot" hidden />        <button type="submit" class="px-4 py-2 bg-zinc-200 dark:bg-zinc-800 font-display font-bold text-sm hover:bg-brand-pink hover:text-white transition-colors">Reply</button>
       </form>
     </article>
     {% endfor %}
@@ -197,7 +196,7 @@
 
   <div class="bg-brand-surfaceLight dark:bg-brand-surfaceDark border border-zinc-200 dark:border-zinc-800 p-6">
     <h3 class="font-display font-bold text-xl mb-6">Post a Comment</h3>
-    <form method="post" action="{% url 'comment_post' %}" class="space-y-4">
+    <form method="post" action="{% url 'comment_post' %}" data-comment-form class="space-y-4">
       {% csrf_token %}
       <input type="hidden" name="article_id" value="{{ page.id }}" />
       <div class="grid grid-cols-1 md:grid-cols-2 gap-4">
@@ -217,7 +216,7 @@
         <textarea name="body" required rows="5"
           class="w-full bg-transparent border border-zinc-300 dark:border-zinc-700 px-4 py-2 font-mono text-sm focus:outline-none focus:border-brand-pink transition-colors resize-none">{% if comment_form %}{{ comment_form.body.value|default:'' }}{% endif %}</textarea>
       </div>
-      <input type="text" name="honeypot" style="display:none" />
+      <input type="text" name="honeypot" hidden />
       <button type="submit" class="px-6 py-3 bg-brand-dark text-brand-light dark:bg-brand-light dark:text-brand-dark font-display font-bold hover:-translate-y-1 hover:shadow-solid-dark dark:hover:shadow-solid-light transition-all">Post comment</button>
     </form>
   </div>