Show up to 3 news items on Home, with a link to a full "All news" page

Home's news card now shows up to 3 recent items (lead item with its photo
placeholder, the next two as compact rows) instead of just the latest
one, plus an "All news" link -- the design canvas's own M1 markup already
had that link, just unbuilt until now. Both also now filter by
visibility (internal or both, never external-only -- that's the public
website's own audience), which the teaser never actually enforced before.

New mobile:news_list page is the full archive: every published,
member-visible item for the club, newest first, not narrowed to any
particular team the way Home's own teaser is. Paginated at 20/page. The
bottom tab bar's News tab now links here instead of a dead #news anchor
on Home.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ECGMEwrc2k4D8VQuwjstj9

mobile/urls.py

@@ -14,6 +14,7 @@ urlpatterns = [
     path("", views.HomeView.as_view(), name="home"),
     path("calendar/", views.CalendarView.as_view(), name="calendar"),
     path("events/<uuid:pk>/", views.EventDetailView.as_view(), name="event_detail"),
+    path("news/", views.NewsListView.as_view(), name="news_list"),
     path("news/<slug:slug>/", views.NewsDetailView.as_view(), name="news_detail"),
     path("me/", views.MeView.as_view(), name="me"),
     path("me/<uuid:member_id>/edit/", views.EditProfileView.as_view(), name="edit_profile"),