style(cards): normalize card list layout and padding across pages

app/(order)/chat/page.tsx

@@ -16,15 +16,15 @@ export default function ChatListPage() {
     <div className="container mx-auto max-w-2xl px-4 py-8 space-y-6">
       <h1 className="text-2xl font-bold">消息</h1>
 
-      <div className="space-y-4">
+      <div className="flex flex-col gap-3">
         {sessions.map((session) => {
           const other =
             session.participants.find((participant) => participant.id !== userId) ??
             session.participants[0]
           return (
-            <Link key={session.id} href={`/chat/${session.id}`}>
-              <Card>
-                <CardContent className="flex items-center gap-3 py-3">
+            <Link key={session.id} href={`/chat/${session.id}`} className="block">
+              <Card className="p-0 hover:bg-muted/50 transition-colors">
+                <CardContent className="flex items-center gap-3 p-4">
                   <Avatar className="h-10 w-10">
                     <AvatarImage src={other.avatar} />
                     <AvatarFallback>{other.name[0]}</AvatarFallback>