Feuilles de poste : ajouter la photo des bénévoles affectés

Vignette carrée (14 mm, proportions préservées) à côté du nom de chaque
bénévole affecté, à côté de son téléphone — case vide si le bénévole n'a
pas de photo. Complète l'affichage déjà en place sur l'écran référent et
l'écran bénévole (étape 22).

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

backend/tests/test_position_sheets_api.py

@@ -1,8 +1,16 @@
 """Feuilles de poste (PDF) — API."""
 
+import base64
+
 from app.models import Assignment, Role
 from tests.factories import dt_at, make_position, make_shift, make_volunteer
 
+# PNG 1×1 valide (transparent), le plus petit possible.
+_PNG = base64.b64decode(
+    "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY"
+    "42YAAAAASUVORK5CYII="
+)
+
 
 def _url(edition):
     return f"/editions/{edition.id}/position-sheets/generate"
@@ -70,6 +78,29 @@ def test_generates_a_pdf_with_a_referent(client, edition, session, make_account)
     assert resp.content.startswith(b"%PDF")
 
 
+def test_includes_a_volunteer_photo_when_present(client, edition, session):
+    position = make_position(session, edition, name="Bar central")
+    shift = make_shift(
+        session, edition, position, start=dt_at(9, 19), end=dt_at(9, 22),
+        min_staff=1, ideal_staff=2,
+    )
+    with_photo = make_volunteer(session, edition, first_name="Alex", last_name="Martin")
+    with_photo.photo = _PNG
+    with_photo.photo_content_type = "image/png"
+    without_photo = make_volunteer(session, edition, first_name="Sam", last_name="Nuit")
+    session.add_all(
+        [
+            Assignment(edition_id=edition.id, volunteer_id=with_photo.id, shift_id=shift.id),
+            Assignment(edition_id=edition.id, volunteer_id=without_photo.id, shift_id=shift.id),
+        ]
+    )
+    session.commit()
+
+    resp = client.post(_url(edition), json={})
+    assert resp.status_code == 200
+    assert resp.content.startswith(b"%PDF")
+
+
 def test_position_ids_filter_scopes_the_sheets(client, edition, session):
     bar = make_position(session, edition, name="Bar central")
     welcome = make_position(session, edition, name="Accueil")