test(person): add now-required precision fields to Person test fixtures

birthDatePrecision/deathDatePrecision are @Schema REQUIRED, so the
generated Person type makes them non-optional — fixtures that were
type-clean before the regen get UNKNOWN defaults.

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

frontend/src/lib/geschichte/GeschichteEditor.svelte.spec.ts

@@ -10,6 +10,8 @@ const personFactory = (id: string, displayName: string) => ({
 	lastName: displayName.split(' ').slice(1).join(' ') || displayName,
 	displayName,
 	personType: 'PERSON' as const,
+	birthDatePrecision: 'UNKNOWN' as const,
+	deathDatePrecision: 'UNKNOWN' as const,
 	familyMember: false,
 	provisional: false
 });