Move email previews onto the Club identity page; add PDF previews

Three top-level tabs (Identity/Email/PDF) replace the standalone
Settings > Email previews page and the small mock that used to live
inside the Identity tab's own Email sub-tab. Email and PDF now show
every real branded email/generated PDF this club can send, rendered
with sample data via a shared _document_preview_card.html partial
(email cards keep the HTML/plain-text toggle; PDF cards -- the
underlying HTML WeasyPrint would turn into a PDF, shown directly
rather than round-tripping through WeasyPrint -- don't need one).

Added a password-reset email preview (previously missing from the
audit -- it's allauth's own send path, not one of this app's, so it
didn't show up in the earlier grep for EmailMultiAlternatives/.send()
calls). Dropped parent-claim-approved: not directly used right now.

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

management/urls.py

@@ -135,8 +135,8 @@ urlpatterns = [
     path("forms/<uuid:pk>/submissions/", views.SubmissionListView.as_view(), name="submission_list"),
     # Settings (admin only)
     path("settings/", views.ClubSettingsView.as_view(), name="club_settings"),
-    path("settings/email-previews/", views.EmailPreviewListView.as_view(), name="email_preview_list"),
     path("settings/email-previews/<str:key>/render/", views.EmailPreviewRenderView.as_view(), name="email_preview_render"),
+    path("settings/pdf-previews/<str:key>/render/", views.PDFPreviewRenderView.as_view(), name="pdf_preview_render"),
     path("settings/onboarding-requirements/", views.OnboardingRequirementListView.as_view(), name="onboarding_requirement_list"),
     path("settings/onboarding-requirements/new/", views.OnboardingRequirementCreateView.as_view(), name="onboarding_requirement_create"),
     path("settings/onboarding-requirements/<uuid:pk>/edit/", views.OnboardingRequirementUpdateView.as_view(), name="onboarding_requirement_update"),