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/blog/article_page.html

@@ -152,13 +152,6 @@
   </div>
   {% endif %}
 
-  {% if comment_form and comment_form.errors %}
-  <div aria-label="Comment form errors" class="mb-6 p-4 bg-red-50 dark:bg-red-900/20 border border-red-200 dark:border-red-800 font-mono text-sm text-red-600 dark:text-red-400">
-    {{ comment_form.non_field_errors }}
-    {% for field in comment_form %}{{ field.errors }}{% endfor %}
-  </div>
-  {% endif %}
-
   {% include "comments/_comment_form.html" %}
 </section>
 {% endif %}