feat(ui): unify content shell layout

components/dashboard-sidebar.tsx

@@ -40,8 +40,8 @@ export function DashboardSidebar() {
   const links = currentRole === "owner" ? ownerLinks : playerLinks
 
   return (
-    <aside className="w-56 shrink-0 border-r bg-muted/30">
-      <div className="flex h-14 items-center gap-2 border-b px-4 font-semibold">
+    <aside className="w-56 shrink-0 border-r border-border/60 bg-background/80">
+      <div className="flex h-14 items-center gap-2 border-b border-border/60 px-4 font-semibold">
         <Gamepad2 className="h-4 w-4" />
         管理后台
       </div>
@@ -52,8 +52,13 @@ export function DashboardSidebar() {
           return (
             <Button
               key={link.href}
-              variant={isActive ? "secondary" : "ghost"}
-              className={cn("w-full justify-start", !isActive && "text-muted-foreground")}
+              variant="ghost"
+              className={cn(
+                "h-10 w-full justify-start rounded-md border-l-2 transition-colors",
+                isActive
+                  ? "border-primary bg-primary/5 text-foreground font-medium"
+                  : "border-transparent text-muted-foreground hover:bg-accent/50 hover:text-foreground",
+              )}
               asChild
             >
               <Link href={link.href}>