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>

apps/core/management/commands/seed_e2e_content.py

@@ -6,6 +6,7 @@ from wagtail.models import Page, Site
 
 from apps.authors.models import Author
 from apps.blog.models import AboutPage, ArticleIndexPage, ArticlePage, HomePage, TagMetadata
+from apps.comments.models import Comment
 from apps.legal.models import LegalIndexPage, LegalPage
 
 
@@ -51,7 +52,17 @@ class Command(BaseCommand):
             article_index.add_child(instance=article)
             article.save_revision().publish()
 
-        # Tagged article — used by tag-filter E2E tests
+        # Seed one approved top-level comment on the primary article for reply E2E tests
+        if not Comment.objects.filter(article=article, author_name="E2E Approved Commenter").exists():
+            Comment.objects.create(
+                article=article,
+                author_name="E2E Approved Commenter",
+                author_email="approved@example.com",
+                body="This is a seeded approved comment for reply testing.",
+                is_approved=True,
+            )
+
+
         tag, _ = Tag.objects.get_or_create(name="AI Tools", slug="ai-tools")
         TagMetadata.objects.get_or_create(tag=tag, defaults={"colour": "cyan"})
         tagged_article = ArticlePage.objects.child_of(article_index).filter(slug="e2e-tagged-article").first()