refactor(dashboard): extract settled<T>() helper; fix page.svelte.spec.ts types

Collapses 5x duplicated null-check pattern in the reader fetch branch into
a single typed helper — addresses @Felix review blocker.

Also adds isReader/incompleteDocs/incompleteTotal to page.svelte.spec.ts
baseData so it satisfies the discriminated PageData union introduced by this PR.

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

frontend/src/routes/+page.server.ts

@@ -13,6 +13,12 @@ type PersonSummaryDTO = components['schemas']['PersonSummaryDTO'];
 type Document = components['schemas']['Document'];
 type Geschichte = components['schemas']['Geschichte'];
 
+function settled<T>(res: PromiseSettledResult<unknown> | undefined): T | null {
+	if (res?.status !== 'fulfilled') return null;
+	const v = res.value as { response: Response; data: unknown };
+	return v.response.ok ? ((v.data as T) ?? null) : null;
+}
+
 export async function load({ fetch, parent }) {
 	const { canWrite, canAnnotate, canBlogWrite } = await parent();
 	const isReader = !canWrite && !canAnnotate;
@@ -43,45 +49,12 @@ export async function load({ fetch, parent }) {
 			const [statsRes, topPersonsRes, recentDocsRes, recentStoriesRes, draftsRes] =
 				await Promise.allSettled(readerFetches);
 
-			let readerStats: StatsDTO | null = null;
-			let topPersons: PersonSummaryDTO[] = [];
-			let recentDocs: Document[] = [];
-			let recentStories: Geschichte[] = [];
-			let drafts: Geschichte[] = [];
-
-			if (
-				statsRes?.status === 'fulfilled' &&
-				(statsRes.value as { response: Response }).response.ok
-			) {
-				readerStats = ((statsRes.value as { data: unknown }).data as StatsDTO) ?? null;
-			}
-			if (
-				topPersonsRes?.status === 'fulfilled' &&
-				(topPersonsRes.value as { response: Response }).response.ok
-			) {
-				topPersons = ((topPersonsRes.value as { data: unknown }).data as PersonSummaryDTO[]) ?? [];
-			}
-			if (
-				recentDocsRes?.status === 'fulfilled' &&
-				(recentDocsRes.value as { response: Response }).response.ok
-			) {
-				const searchResult = (recentDocsRes.value as { data: unknown }).data as {
-					items: { document: Document }[];
-				} | null;
-				recentDocs = searchResult?.items.map((i) => i.document) ?? [];
-			}
-			if (
-				recentStoriesRes?.status === 'fulfilled' &&
-				(recentStoriesRes.value as { response: Response }).response.ok
-			) {
-				recentStories = ((recentStoriesRes.value as { data: unknown }).data as Geschichte[]) ?? [];
-			}
-			if (
-				draftsRes?.status === 'fulfilled' &&
-				(draftsRes.value as { response: Response }).response.ok
-			) {
-				drafts = ((draftsRes.value as { data: unknown }).data as Geschichte[]) ?? [];
-			}
+			const readerStats = settled<StatsDTO>(statsRes);
+			const topPersons = settled<PersonSummaryDTO[]>(topPersonsRes) ?? [];
+			const searchData = settled<{ items: { document: Document }[] }>(recentDocsRes);
+			const recentDocs = searchData?.items.map((i) => i.document) ?? [];
+			const recentStories = settled<Geschichte[]>(recentStoriesRes) ?? [];
+			const drafts = settled<Geschichte[]>(draftsRes) ?? [];
 
 			return {
 				isReader: true as const,

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

@@ -20,6 +20,7 @@ const baseData = {
 		enabled: true,
 		createdAt: '2024-01-01T00:00:00Z'
 	} as User,
+	isReader: false as const,
 	canWrite: true,
 	canAnnotate: false,
 	canBlogWrite: false,
@@ -31,6 +32,8 @@ const baseData = {
 	transcriptionDocs: [],
 	readyDocs: [],
 	weeklyStats: null,
+	incompleteDocs: [],
+	incompleteTotal: 0,
 	error: null
 };