fix: resolve review round 2, E2E failures, and mypy error

Review blocker A — form error swap and false success:
- Change HTMX contract so forms target their own container (outerHTML)
  instead of appending to #comments-list
- Use OOB swaps to append approved comments to the correct target
- Add success/error message display inside form templates
- Remove hx-on::after-request handlers (no longer needed)

Review blocker B — reply rendering shape:
- Create _reply.html partial with compact reply markup
- Approved replies via HTMX now use compact template + OOB swap
  into parent's .replies-container
- Reply form errors render inside reply form container

E2E test fixes:
- Update 4 failing tests to wait for inline HTMX messages instead
  of redirect-based URL assertions
- Add aria-label='Comment form errors' to form error display
- Rename test_reply_submission_redirects to
  test_reply_submission_shows_moderation_message

Mypy internal error workaround:
- Add mypy override for apps.comments.views (django-stubs triggers
  internal error on ORM annotate() chain with mypy 1.11.2)

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

templates/comments/_reply_form.html

@@ -1,20 +1,30 @@
 {% load static %}
-<form method="post" action="{% url 'comment_post' %}" class="mt-4 pt-4 border-t border-zinc-100 dark:border-zinc-800"
-  hx-post="{% url 'comment_post' %}" hx-target="#comments-list" hx-swap="beforeend" hx-on::after-request="if(event.detail.successful) this.reset()">
-  {% csrf_token %}
-  <input type="hidden" name="article_id" value="{{ page.id }}" />
-  <input type="hidden" name="parent_id" value="{{ comment.id }}" />
-  <div class="flex gap-3 mb-3">
-    <input type="text" name="author_name" required placeholder="Your name"
-      class="flex-1 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 focus:shadow-neon-pink transition-colors" />
-    <input type="email" name="author_email" required placeholder="your@email.com"
-      class="flex-1 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 focus:shadow-neon-pink transition-colors" />
-  </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 focus:shadow-neon-pink transition-colors mb-3 resize-none"></textarea>
-  <input type="text" name="honeypot" hidden />
-  {% if turnstile_site_key %}
-  <div class="cf-turnstile mb-3" data-sitekey="{{ turnstile_site_key }}" data-theme="auto" data-size="compact"></div>
+<div id="reply-form-container-{{ comment.id }}" class="mt-4 pt-4 border-t border-zinc-100 dark:border-zinc-800">
+  {% if reply_success_message %}
+  <div class="mb-3 p-2 font-mono text-sm bg-brand-cyan/10 text-brand-cyan border border-brand-cyan/20">{{ reply_success_message }}</div>
   {% endif %}
-  <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>
+  {% if reply_form_errors %}
+  <div aria-label="Comment form errors" class="mb-3 p-2 font-mono text-sm bg-red-50 dark:bg-red-900/20 text-red-600 dark:text-red-400 border border-red-200 dark:border-red-800">
+    {% for field, errors in reply_form_errors.items %}{% for error in errors %}<p>{{ error }}</p>{% endfor %}{% endfor %}
+  </div>
+  {% endif %}
+  <form method="post" action="{% url 'comment_post' %}"
+    hx-post="{% url 'comment_post' %}" hx-target="#reply-form-container-{{ comment.id }}" hx-swap="outerHTML">
+    {% csrf_token %}
+    <input type="hidden" name="article_id" value="{{ page.id }}" />
+    <input type="hidden" name="parent_id" value="{{ comment.id }}" />
+    <div class="flex gap-3 mb-3">
+      <input type="text" name="author_name" required placeholder="Your name"
+        class="flex-1 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 focus:shadow-neon-pink transition-colors" />
+      <input type="email" name="author_email" required placeholder="your@email.com"
+        class="flex-1 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 focus:shadow-neon-pink transition-colors" />
+    </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 focus:shadow-neon-pink transition-colors mb-3 resize-none"></textarea>
+    <input type="text" name="honeypot" hidden />
+    {% if turnstile_site_key %}
+    <div class="cf-turnstile mb-3" data-sitekey="{{ turnstile_site_key }}" data-theme="auto" data-size="compact"></div>
+    {% endif %}
+    <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>
+</div>