fix(authors): persist dismissal of metadata enrichment completed notifications

Include completion timestamp in enrichment status payloads and track card dismissal in useMetadataCardDismissal to prevent finished notifications from reappearing across page navigations.

Closes #895

packages/types/src/author.ts

@@ -55,6 +55,7 @@ export type AuthorEnrichmentStatus = {
   processing: number;
   rateLimited: number;
   failed: number;
+  latestFailureAt: string | null;
   done: number;
   total: number;
 };

packages/types/src/book-metadata-fetch.ts

@@ -49,6 +49,7 @@ export interface BookMetadataFetchStatus {
   queued: number;
   processing: number;
   failed: number;
+  latestFailureAt: string | null;
   paused: boolean;
 }