test(geschichten): add failing tests for draft fetch in page loader

RED: loader does not yet call parent() or fetch DRAFT stories.
Also extracts settled<T>() helper to $lib/shared/server/settled.ts
and seeds makeData/callLoad factories with drafts/parent defaults.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/routes/geschichten/page.svelte.spec.ts

@@ -26,6 +26,7 @@ function person(id: string, displayName: string) {
 function makeData(overrides: Partial<PageData> = {}): PageData {
 	return {
 		geschichten: [],
+		drafts: [],
 		personFilters: [],
 		documentFilter: null,
 		canBlogWrite: false,