Feuilles de poste : ajouter le référent en en-tête

Nom + téléphone du référent du poste (Position.lead_account_id), juste
sous le sous-titre (jour/lieu) — « Référent : à désigner » si aucun.
Même source que le référent affiché à l'écran bénévole
(volunteers.py:get_volunteer_planning).

Vérifié : pytest (287 passés, dont les nouveaux tests avec/sans
référent), ruff, alembic check — tous verts (pas de changement
frontend, la feuille reste un simple téléchargement de PDF).

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

backend/app/api/position_sheets.py

@@ -10,6 +10,7 @@ import uuid
 from collections import defaultdict
 
 from fastapi import APIRouter, Depends, HTTPException, Response
+from sqlalchemy.orm import aliased
 from sqlmodel import Session, select
 
 from app.api.deps import get_edition
@@ -77,12 +78,27 @@ def generate_position_sheets(
             continue
         shifts_by_position_day[(shift.position_id, shift.starts_at.date())].append(shift)
 
+    Referent = aliased(Volunteer)
+    referent_rows = session.exec(
+        select(Position.id, Referent)
+        .join(Account, Account.id == Position.lead_account_id, isouter=True)
+        .join(Referent, Referent.id == Account.volunteer_id, isouter=True)
+        .where(Position.id.in_(position_ids))
+    ).all()
+    referent_by_position: dict[uuid.UUID, Volunteer] = {
+        pid: referent for pid, referent in referent_rows if referent is not None
+    }
+
     positions_by_id = {p.id: p for p in positions}
-    sheets = [
-        PositionDaySheet(
+
+    def _sheet(position_id: uuid.UUID, date: dt.date, day_shifts: list[Shift]) -> PositionDaySheet:
+        referent = referent_by_position.get(position_id)
+        return PositionDaySheet(
             position_name=positions_by_id[position_id].name,
             position_location=positions_by_id[position_id].location,
             date=date,
+            referent_name=f"{referent.first_name} {referent.last_name}" if referent else None,
+            referent_phone=referent.phone if referent else None,
             shifts=tuple(
                 SheetShift(
                     starts_at=s.starts_at,
@@ -97,6 +113,9 @@ def generate_position_sheets(
                 for s in sorted(day_shifts, key=lambda s: s.starts_at)
             ),
         )
+
+    sheets = [
+        _sheet(position_id, date, day_shifts)
         for (position_id, date), day_shifts in sorted(
             shifts_by_position_day.items(),
             key=lambda item: (positions_by_id[item[0][0]].name, item[0][1]),

backend/app/sheets/pdf.py

@@ -64,6 +64,10 @@ class PositionDaySheet:
     position_location: str | None
     date: dt.date
     shifts: tuple[SheetShift, ...]
+    # None si le poste n'a pas (encore) de référent désigné
+    # (`Position.lead_account_id`).
+    referent_name: str | None = None
+    referent_phone: str | None = None
 
 
 def _styles() -> dict[str, ParagraphStyle]:
@@ -74,7 +78,11 @@ def _styles() -> dict[str, ParagraphStyle]:
         ),
         "subtitle": ParagraphStyle(
             "SheetSubtitle", parent=base["Normal"],
-            fontSize=12, textColor=colors.grey, spaceAfter=16,
+            fontSize=12, textColor=colors.grey, spaceAfter=4,
+        ),
+        "referent": ParagraphStyle(
+            "SheetReferent", parent=base["Normal"],
+            fontSize=11.5, fontName="Helvetica-Bold", spaceAfter=16,
         ),
         "shiftHeader": ParagraphStyle(
             "ShiftHeader", parent=base["Heading3"], fontSize=13, spaceBefore=12, spaceAfter=4
@@ -125,6 +133,14 @@ def generate_position_sheets_pdf(sheets: list[PositionDaySheet]) -> bytes:
             subtitle += f" — {sheet.position_location}"
         story.append(Paragraph(subtitle, styles["subtitle"]))
 
+        if sheet.referent_name:
+            referent_line = f"Référent : {sheet.referent_name}"
+            if sheet.referent_phone:
+                referent_line += f" — {sheet.referent_phone}"
+            story.append(Paragraph(referent_line, styles["referent"]))
+        else:
+            story.append(Paragraph("Référent : à désigner", styles["referent"]))
+
         if not sheet.shifts:
             story.append(Paragraph("Aucun créneau ce jour-là.", styles["normal"]))
             continue