feat(#145): switch dashboard to show last-activity documents

Replace recent-by-creation fetch with GET /api/documents/recent-activity
(sorted by updatedAt) in the dashboard. Update DashboardRecentDocuments
component to use doc.updatedAt, update i18n heading to "Zuletzt aktiv" /
"Recent Activity" / "Actividad reciente", and regenerate API types.

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

frontend/messages/de.json

@@ -318,7 +318,7 @@
 	"dashboard_notification_replied": "hat geantwortet",
 	"dashboard_needs_metadata_heading": "Metadaten fehlen",
 	"dashboard_needs_metadata_show_all": "Alle anzeigen",
-	"dashboard_recent_heading": "Zuletzt hinzugefügt",
+	"dashboard_recent_heading": "Zuletzt aktiv",
 	"dashboard_resume_label": "Zuletzt geöffnet:",
 	"dashboard_resume_fallback": "Unbekanntes Dokument"
 }

frontend/messages/en.json

@@ -318,7 +318,7 @@
 	"dashboard_notification_replied": "replied",
 	"dashboard_needs_metadata_heading": "Missing Metadata",
 	"dashboard_needs_metadata_show_all": "Show all",
-	"dashboard_recent_heading": "Recently Added",
+	"dashboard_recent_heading": "Recent Activity",
 	"dashboard_resume_label": "Last opened:",
 	"dashboard_resume_fallback": "Unknown document"
 }

frontend/messages/es.json

@@ -318,7 +318,7 @@
 	"dashboard_notification_replied": "respondió",
 	"dashboard_needs_metadata_heading": "Metadatos incompletos",
 	"dashboard_needs_metadata_show_all": "Ver todos",
-	"dashboard_recent_heading": "Añadidos recientemente",
+	"dashboard_recent_heading": "Actividad reciente",
 	"dashboard_resume_label": "Último abierto:",
 	"dashboard_resume_fallback": "Documento desconocido"
 }

frontend/src/lib/components/DashboardRecentDocuments.svelte

@@ -5,7 +5,7 @@ import { getLocale } from '$lib/paraglide/runtime.js';
 type Document = {
 	id: string;
 	title: string;
-	createdAt?: string;
+	updatedAt?: string;
 	sender?: { id: string; firstName: string; lastName: string };
 };
 
@@ -37,12 +37,12 @@ function formatDate(dateStr: string): string {
 				>
 					{doc.title}
 				</a>
-				{#if doc.createdAt}
+				{#if doc.updatedAt}
 					<span
 						data-testid="doc-date-{doc.id}"
 						class="ml-2 shrink-0 font-sans text-xs text-gray-400"
 					>
-						{formatDate(doc.createdAt)}
+						{formatDate(doc.updatedAt)}
 					</span>
 				{/if}
 			</div>

frontend/src/lib/components/DashboardRecentDocuments.svelte.spec.ts

@@ -9,12 +9,12 @@ afterEach(cleanup);
 type Document = {
 	id: string;
 	title: string;
-	createdAt?: string;
+	updatedAt?: string;
 	sender?: { id: string; firstName: string; lastName: string };
 };
 
-function makeDoc(id: string, title: string, createdAt?: string): Document {
+function makeDoc(id: string, title: string, updatedAt?: string): Document {
-	return { id, title, createdAt };
+	return { id, title, updatedAt };
 }
 
 describe('DashboardRecentDocuments', () => {

frontend/src/lib/generated/api.ts

@@ -628,6 +628,22 @@ export interface paths {
         patch?: never;
         trace?: never;
     };
+    "/api/documents/recent-activity": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        get: operations["getRecentActivity"];
+        put?: never;
+        post?: never;
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
     "/api/documents/incomplete": {
         parameters: {
             query?: never;
@@ -2328,6 +2344,28 @@ export interface operations {
             };
         };
     };
+    getRecentActivity: {
+        parameters: {
+            query?: {
+                size?: number;
+            };
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description OK */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "*/*": components["schemas"]["Document"][];
+                };
+            };
+        };
+    };
     getIncomplete: {
         parameters: {
             query?: {

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

@@ -60,7 +60,7 @@ export async function load({ url, fetch }) {
 			const [mentionsResult, incompleteResult, recentResult] = await Promise.allSettled([
 				api.GET('/api/notifications', { params: { query: { size: 5 } } }),
 				api.GET('/api/documents/incomplete', { params: { query: { size: 5 } } }),
-				api.GET('/api/documents/search', { params: { query: {} } })
+				api.GET('/api/documents/recent-activity', { params: { query: { size: 5 } } })
 			]);
 
 			if (mentionsResult.status === 'fulfilled' && mentionsResult.value.response.ok) {
@@ -70,7 +70,7 @@ export async function load({ url, fetch }) {
 				incompleteDocs = incompleteResult.value.data ?? [];
 			}
 			if (recentResult.status === 'fulfilled' && recentResult.value.response.ok) {
-				recentDocs = (recentResult.value.data ?? []).slice(0, 5);
+				recentDocs = recentResult.value.data ?? [];
 			}
 		}