feat: add ApkCard component

app/download/ApkCard.tsx

@@ -0,0 +1,51 @@
+// app/download/ApkCard.tsx
+import { formatFileSize, formatDateTime } from '@/lib/fs-utils';
+
+interface ApkCardProps {
+  name: string;
+  commit: string | null;
+  size: number;
+  modifiedAt: string;
+  downloadUrl: string;
+  highlightCommit?: string;
+}
+
+export default function ApkCard({ name, commit, size, modifiedAt, downloadUrl, highlightCommit }: ApkCardProps) {
+  // 高亮显示 commit id
+  const displayName = commit && highlightCommit
+    ? name.replace(new RegExp(commit, 'gi'), (match) => `<mark class="bg-yellow-200">${match}</mark>`)
+    : name;
+
+  return (
+    <div className="bg-white border border-gray-200 rounded-lg p-4 hover:shadow-md transition-shadow">
+      <h3
+        className="text-lg font-semibold text-gray-800 mb-2 break-all"
+        dangerouslySetInnerHTML={{ __html: displayName }}
+      />
+
+      <div className="space-y-1 text-sm text-gray-600 mb-4">
+        <div className="flex justify-between">
+          <span>文件大小:</span>
+          <span className="font-medium">{formatFileSize(size)}</span>
+        </div>
+        <div className="flex justify-between">
+          <span>修改时间:</span>
+          <span className="font-medium">{formatDateTime(new Date(modifiedAt))}</span>
+        </div>
+        {commit && (
+          <div className="flex justify-between">
+            <span>Commit:</span>
+            <span className="font-medium font-mono">{commit}</span>
+          </div>
+        )}
+      </div>
+
+      <a
+        href={downloadUrl}
+        className="block w-full text-center bg-green-600 text-white py-2 px-4 rounded-md hover:bg-green-700 transition-colors"
+      >
+        下载 APK
+      </a>
+    </div>
+  );
+}