update(Journal): 期刊封面改为宽高固定，y轴居中，溢出隐藏

src/components/Journal/JournalCard.tsx

@@ -31,17 +31,17 @@ export default function JournalCard({
 }) {
   return (
     /* banner container */
-    <div className={`relative w-712px h-fit rounded-6px overflow-hidden bg-[url(${image})] group ${className}`}>
+    <div className={`relative w-712px h-420px rounded-6px overflow-hidden bg-[url(${image})] group ${className}`}>
       {/* 左上方 角标 */}
       <VolNo className="absolute top-16px left-16px" text={journalNo} />
       {/* banner */}
       <Image
-        width={0}
-        height={0}
+        width={712}
+        height={420}
         src={image}
         unoptimized
         alt={`Vol${journalNo}`}
-        className={`w-100% h-auto ${scale && 'group-hover:transform-scale-103 transition-transform-300'}`}
+        className={`absolute top-50% left-0 transform-translate-y-[-50%] w-full h-auto object-cover object-c ${scale && 'group-hover:transform-scale-103 transition-transform-300'}`}
       />
       {/* 标题 */}
       {!!title && (