refactor(shadow): introduce shadow-card utility and extend tailwind-merge

app/(dashboard)/dashboard/shop/templates/page.tsx

@@ -141,7 +141,7 @@ function ShopTemplatesEditor({
         </div>
       </div>
 
-      <Card className="hover:shadow-[var(--shadow-card)]">
+      <Card className="hover:shadow-card-hover">
         <CardHeader>
           <CardTitle className="text-base">页面组件</CardTitle>
         </CardHeader>
@@ -184,7 +184,7 @@ function ShopTemplatesEditor({
         </CardContent>
       </Card>
 
-      <Card className="hover:shadow-[var(--shadow-card)]">
+      <Card className="hover:shadow-card-hover">
         <CardHeader>
           <CardTitle className="text-base">提示</CardTitle>
         </CardHeader>