Update member UI and related app changes

tests/test_housekeeper.py

@@ -113,3 +113,28 @@ def test_housekeeper_reports_invalid_member_dates(tmp_path) -> None:
     assert len(invalid) == 1
     assert invalid[0].member_id == member.member_id
     assert "Geburtsdatum" in invalid[0].detail
+
+
+def test_housekeeper_can_treat_selected_member_fields_as_optional(tmp_path) -> None:
+    repository = MemberRepository(tmp_path)
+    repository.initialize()
+    member = repository.create_member(first_name="Optional", last_name="Fields")
+    member.status = "active"
+    repository.save_member(member)
+    settings = HousekeeperSettings.from_values(
+        birthday_days_before=0,
+        birthday_days_after=0,
+        anniversary_days_before=0,
+        anniversary_days_after=0,
+        anniversary_intervals="1Y",
+        optional_member_fields=("nickname", "email", "phone", "birth_date"),
+    )
+
+    findings = Housekeeper(repository, settings).run(today=date(2026, 6, 21))
+
+    codes = {finding.code for finding in findings}
+    assert "missing_birth_date" not in codes
+    assert "missing_member_field:nickname" not in codes
+    assert "missing_member_field:email" not in codes
+    assert "missing_member_field:phone" not in codes
+    assert "missing_member_field:street" in codes