fix(documents): WCAG text-size and API error pattern fixes

- DashboardResumeStrip: text-[10px] → text-xs on collaborator initials (WCAG 1.4.4)
- documents/+page.server.ts: use !result.response.ok per CLAUDE.md; keep narrow try/catch for network-level failures only

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

frontend/src/lib/components/DashboardResumeStrip.svelte

@@ -97,7 +97,7 @@ function safeColor(color: string): string {
 				</div>
 				{#each resumeDoc.collaborators.slice(0, 3) as collab (collab.initials + collab.color)}
 					<span
-						class="-ml-1 inline-flex h-6 w-6 items-center justify-center rounded-full font-sans text-[10px] font-bold text-white ring-2 ring-white"
+						class="-ml-1 inline-flex h-6 w-6 items-center justify-center rounded-full font-sans text-xs font-bold text-white ring-2 ring-white"
 						style="background:{safeColor(collab.color)}">{collab.initials}</span
 					>
 				{/each}

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

@@ -1,5 +1,6 @@
 import { redirect } from '@sveltejs/kit';
 import { createApiClient } from '$lib/api.server';
+import { getErrorMessage } from '$lib/errors';
 import type { components } from '$lib/generated/api';
 
 type DocumentSearchItem = components['schemas']['DocumentSearchItem'];
@@ -29,8 +30,9 @@ export async function load({ url, fetch }) {
 
 	const api = createApiClient(fetch);
 
+	let result;
 	try {
-		const result = await api.GET('/api/documents/search', {
+		result = await api.GET('/api/documents/search', {
 			params: {
 				query: {
 					q: q || undefined,
@@ -46,32 +48,7 @@ export async function load({ url, fetch }) {
 				}
 			}
 		});
-
-		if (result.response.status === 401) {
-			throw redirect(302, '/login');
-		}
-
-		const items: DocumentSearchItem[] = (result.data?.items ?? []) as DocumentSearchItem[];
-		const total: number = result.data?.total ?? 0;
-
-		return {
-			items,
-			total,
-			q,
-			from,
-			to,
-			senderId,
-			receiverId,
-			tags,
-			sort,
-			dir,
-			tagQ,
-			tagOp,
-			error: null as string | null
-		};
-	} catch (e) {
-		if ((e as { status?: number }).status) throw e;
-		console.error('Error loading documents:', e);
+	} catch {
 		return {
 			items: [] as DocumentSearchItem[],
 			total: 0,
@@ -88,4 +65,29 @@ export async function load({ url, fetch }) {
 			error: 'Daten konnten nicht geladen werden.' as string | null
 		};
 	}
+
+	if (result.response.status === 401) {
+		throw redirect(302, '/login');
+	}
+
+	const errorMessage: string | null = !result.response.ok
+		? (getErrorMessage((result.error as unknown as { code?: string })?.code) ??
+			'Daten konnten nicht geladen werden.')
+		: null;
+
+	return {
+		items: (result.data?.items ?? []) as DocumentSearchItem[],
+		total: result.data?.total ?? 0,
+		q,
+		from,
+		to,
+		senderId,
+		receiverId,
+		tags,
+		sort,
+		dir,
+		tagQ,
+		tagOp,
+		error: errorMessage
+	};
 }