Add families list, member kind filter, sidebar counters, pagination

New Families list page (parents/children columns, edit goes to the
detail view). Members list gets a member/guardian/both filter so
guardians aren't just invisible. Sidebar now shows live counts for
pending parent claims and games missing a referee, always numeric.
Member, event, team, group, news and family lists are paginated with
a shared pager partial that preserves the query string.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

rosterchief/settings.py

@@ -200,6 +200,7 @@ TEMPLATES = [
                 "management.context_processors.active_nav_section",
                 "management.context_processors.news_permissions",
                 "management.context_processors.feature_sections",
+                "management.context_processors.sidebar_counters",
             ],
         },
     },