Fix book covers: show full images without cropping

Switch from fill+object-cover (crops to aspect ratio) to explicit
width/height so book covers display at their natural proportions.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cynthia-poetry/src/app/page.tsx

@@ -110,12 +110,13 @@ export default function HomePage() {
           <div className="grid md:grid-cols-2 gap-12">
             {books.map((book) => (
               <div key={book.title} className="flex flex-col items-center text-center">
-                <div className="w-48 md:w-56 aspect-[3/4] bg-stone-200 rounded-sm overflow-hidden relative mb-6">
+                <div className="w-48 md:w-56 mb-6">
                   <Image
                     src={book.coverImage}
                     alt={`${book.title} by ${book.author} — book cover`}
-                    fill
-                    className="object-cover"
+                    width={224}
+                    height={346}
+                    className="w-full h-auto rounded-sm shadow-md"
                     sizes="(max-width: 768px) 192px, 224px"
                   />
                 </div>