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/pdf_previews.py

@@ -0,0 +1,87 @@
+"""Sample renders of every PDF this app can generate -- the PDF tab on the
+Club identity page (management/templates/management/club_settings.html).
+
+Both PDFs (management.pdf.event_referee_form_pdf, and
+club.services.invoicing.invoice_pdf) are themselves just WeasyPrint run over
+an HTML template -- see that HTML directly here rather than running
+WeasyPrint for a preview: it's the same document, without needing the native
+pango/cairo libraries installed just to look at it, and it's exactly what
+management.views.EmailPreviewRenderView's sibling PDFPreviewRenderView shows
+in an iframe. Same "hand-built sample context, no real DB rows" reasoning as
+email_previews.py.
+"""
+
+import datetime
+from collections.abc import Callable
+from dataclasses import dataclass
+from decimal import Decimal
+from types import SimpleNamespace
+
+from django.template.loader import render_to_string
+from django.utils import timezone
+from django.utils.translation import gettext_lazy as _
+
+from .pdf import referee_form_colors
+
+
+@dataclass(frozen=True)
+class PDFPreview:
+    key: str
+    label: str
+    description: str
+    template: str
+    build_context: Callable[..., dict]
+
+
+def _dues_invoice_pdf_context(club, request):
+    invoice = SimpleNamespace(
+        number="DUE-2026-00042",
+        amount=Decimal("45.00"),
+        due_date=timezone.now().date() + datetime.timedelta(days=14),
+        sent_at=timezone.now(),
+        is_paid=False,
+        sent_to_email="jamie.doe@example.com",
+        sent_to_guardian=False,
+    )
+    membership = SimpleNamespace(season="2026-2027")
+    return {"club": club, "invoice": invoice, "membership": membership, "member": "Jamie Doe"}
+
+
+def _referee_form_pdf_context(club, request):
+    referees = [
+        SimpleNamespace(display_name="Jamie Doe", fee=Decimal("35.00"), km=Decimal("12.0"), km_rate=Decimal("0.35"), total_payable=Decimal("39.20")),
+        SimpleNamespace(display_name="Alex Referee", fee=Decimal("35.00"), km=None, km_rate=None, total_payable=Decimal("35.00")),
+    ]
+    event = SimpleNamespace(
+        start=timezone.now() + datetime.timedelta(days=7),
+        teams=SimpleNamespace(all=lambda: [SimpleNamespace(short_name="U16")]),
+        opponent="Leuven",
+        external_game_id="",
+    )
+    home_location = SimpleNamespace(address="Sportlaan 1", zip_code="1000", city="Brussels")
+    grand_total = sum((referee.total_payable for referee in referees), Decimal("0"))
+    return {"club": club, "event": event, "referees": referees, "home_location": home_location, "grand_total": grand_total} | referee_form_colors(club)
+
+
+PDF_PREVIEWS = [
+    PDFPreview(
+        key="dues_invoice",
+        label=_("Membership invoice"),
+        description=_("The PDF attached to the membership invoice email, also downloadable from a member's invoice page."),
+        template="club/dues_invoice_pdf.html",
+        build_context=_dues_invoice_pdf_context,
+    ),
+    PDFPreview(
+        key="referee_form",
+        label=_("Referee payment form"),
+        description=_("Downloadable from a game's page, for the club-arranged referee(s) to sign."),
+        template="management/event_referee_form_pdf.html",
+        build_context=_referee_form_pdf_context,
+    ),
+]
+
+PDF_PREVIEWS_BY_KEY = {preview.key: preview for preview in PDF_PREVIEWS}
+
+
+def render_pdf_preview(preview: PDFPreview, *, club, request) -> str:
+    return render_to_string(preview.template, preview.build_context(club, request))