fix: resolve ruff lint errors (unused imports, import sorting)

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

apps/blog/tests/test_admin_experience.py

@@ -2,7 +2,7 @@ import pytest
 from django.test import override_settings
 from django.utils import timezone
 
-from apps.blog.models import ArticleIndexPage, ArticlePage, Category
+from apps.blog.models import ArticleIndexPage, ArticlePage
 from apps.blog.tests.factories import AuthorFactory
 
 

apps/blog/wagtail_hooks.py

@@ -1,5 +1,3 @@
-from django.utils.html import format_html
-
 import django_filters
 from wagtail import hooks
 from wagtail.admin.filters import WagtailFilterSet