feat: draw generated covers where a book has none

frontend/src/routes/(root)/settings/libraries/[libraryId]/duplicates/+page.svelte

@@ -10,6 +10,7 @@
 	import { Badge } from '$lib/components/ui/badge/index.js';
 	import { Button } from '$lib/components/ui/button/index.js';
 	import BookImage from '$lib/components/view/book-image.svelte';
+	import GeneratedCover from '$lib/components/view/generated-cover.svelte';
 	import { dismissDuplicateBooks } from '$lib/api/book.remote';
 	import MergeBooks from '$lib/components/forms/merge-books/merge-books.svelte';
 	import type { Book, DuplicateBookGroup } from '$lib/schema';
@@ -134,6 +135,17 @@
 									>
 										{#if book.cover_image}
 											<BookImage src="/api/{book.cover_image}" class="h-full w-full object-cover" />
+										{:else}
+											<!-- A blank swatch here is worse than anywhere else: this screen
+											     is a side-by-side comparison, and two of them are impossible
+											     to tell apart. The candidate carries author names rather than
+											     records, which is all the cover draws. -->
+											<GeneratedCover
+												book={{
+													title: book.title,
+													authors: book.authors.map((name) => ({ name }))
+												}}
+											/>
 										{/if}
 									</span>