fix: tolerate invalid member dates in views

tests/test_housekeeper.py

@@ -1,3 +1,4 @@
+import json
 from datetime import date
 
 from ccma.domain.models import ContributionData
@@ -91,3 +92,20 @@ def test_housekeeper_reports_day_month_and_year_anniversaries(tmp_path) -> None:
         "Anniversary2 Member hat heute 1-jähriges Mitgliedsjubiläum",
         "Anniversary3 Member hat in 1 Tag 10-jähriges Mitgliedsjubiläum",
     }
+
+
+def test_housekeeper_reports_invalid_member_dates(tmp_path) -> None:
+    repository = MemberRepository(tmp_path)
+    repository.initialize()
+    member = repository.create_member(first_name="Broken", last_name="Date")
+    member_path = repository.members_root / member.member_id / "member.json"
+    raw = json.loads(member_path.read_text(encoding="utf-8"))
+    raw["person"]["birth_date"] = "31/12/2000"
+    member_path.write_text(json.dumps(raw), encoding="utf-8")
+
+    findings = Housekeeper(repository).run(today=date(2026, 6, 21))
+    invalid = [finding for finding in findings if finding.code == "invalid_member_dates"]
+
+    assert len(invalid) == 1
+    assert invalid[0].member_id == member.member_id
+    assert "Geburtsdatum" in invalid[0].detail