fix(reader-dashboard): recentDocs items were always undefined for READ_ALL users

The server mapped DocumentSearchResult items as { document: Document }[]
but the API returns flat DocumentListItem[] — so i.document was always
undefined, crashing the reader homepage with a 500.

Fix the type + mapping in +page.server.ts, add createdAt/updatedAt to
DocumentListItem (needed by ReaderRecentDocs for relative-time display),
and update the component to accept DocumentListItem instead of Document.

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

frontend/src/lib/generated/api.ts

@@ -2407,6 +2407,10 @@ export interface components {
             completionPercentage: number;
             contributors: components["schemas"]["ActivityActorDTO"][];
             matchData: components["schemas"]["SearchMatchData"];
+            /** Format: date-time */
+            createdAt: string;
+            /** Format: date-time */
+            updatedAt: string;
         };
         DocumentSearchResult: {
             items: components["schemas"]["DocumentListItem"][];