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>

e2e/test_comments.py

@@ -23,12 +23,12 @@ def _submit_comment(page: Page, *, name: str = "E2E Tester", email: str = "e2e@e
 
 @pytest.mark.e2e
 def test_valid_comment_shows_moderation_message(page: Page, base_url: str) -> None:
-    """Successful comment submission must show the awaiting-moderation banner."""
+    """Successful comment submission must show the awaiting-moderation message."""
     _go_to_article(page, base_url)
     _submit_comment(page, body="This is a test comment from Playwright.")
 
-    page.wait_for_url(lambda url: "commented=1" in url, timeout=10_000)
-    expect(page.get_by_text("Your comment is awaiting moderation")).to_be_visible()
+    # HTMX swaps the form container inline — wait for the moderation message
+    expect(page.get_by_text("awaiting moderation")).to_be_visible(timeout=10_000)
 
 
 @pytest.mark.e2e
@@ -38,7 +38,8 @@ def test_valid_comment_not_immediately_visible(page: Page, base_url: str) -> Non
     unique_body = "Unique unmoderated comment body xq7z"
     _submit_comment(page, body=unique_body)
 
-    page.wait_for_url(lambda url: "commented=1" in url, timeout=10_000)
+    # Wait for HTMX response to settle
+    expect(page.get_by_text("awaiting moderation")).to_be_visible(timeout=10_000)
     expect(page.get_by_text(unique_body)).not_to_be_visible()
 
 
@@ -48,7 +49,7 @@ def test_empty_body_shows_form_errors(page: Page, base_url: str) -> None:
     _submit_comment(page, body="   ")  # whitespace-only body
     page.wait_for_load_state("networkidle")
 
-    expect(page.locator('[aria-label="Comment form errors"]')).to_be_visible()
+    expect(page.locator('[aria-label="Comment form errors"]')).to_be_visible(timeout=10_000)
     assert "commented=1" not in page.url
 
 
@@ -78,8 +79,8 @@ def test_reply_form_visible_on_approved_comment(page: Page, base_url: str) -> No
 
 
 @pytest.mark.e2e
-def test_reply_submission_redirects(page: Page, base_url: str) -> None:
-    """Submitting a reply to an approved comment should redirect with commented=1."""
+def test_reply_submission_shows_moderation_message(page: Page, base_url: str) -> None:
+    """Submitting a reply to an approved comment should show moderation message."""
     _go_to_article(page, base_url)
 
     # The reply form is always visible below the approved seeded comment
@@ -89,8 +90,8 @@ def test_reply_submission_redirects(page: Page, base_url: str) -> None:
     reply_form.locator('textarea[name="body"]').fill("This is a test reply.")
     reply_form.get_by_role("button", name="Reply").click()
 
-    page.wait_for_url(lambda url: "commented=1" in url, timeout=10_000)
-    expect(page.get_by_text("Your comment is awaiting moderation")).to_be_visible()
+    # HTMX swaps the reply form container inline
+    expect(page.get_by_text("awaiting moderation")).to_be_visible(timeout=10_000)
 
 
 @pytest.mark.e2e