feat(layout): add terminal layout with Tabs and ScrollArea for testcase display

src/app/(app)/problems/[id]/@terminal/layout.tsx

@@ -0,0 +1,30 @@
+import { SquareCheckIcon } from "lucide-react";
+import { ScrollArea, ScrollBar } from "@/components/ui/scroll-area";
+import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
+
+interface TerminalLayoutProps {
+  testcase: React.ReactNode;
+}
+
+export default function TerminalLayout({ testcase }: TerminalLayoutProps) {
+  return (
+    <Tabs defaultValue="testcase" className="h-full flex flex-col">
+      <ScrollArea className="h-9 flex-none bg-muted">
+        <TabsList>
+          <TabsTrigger value="testcase">
+            <SquareCheckIcon
+              className="-ms-0.5 me-1.5 opacity-60"
+              size={16}
+              aria-hidden="true"
+            />
+            Testcase
+          </TabsTrigger>
+        </TabsList>
+        <ScrollBar orientation="horizontal" />
+      </ScrollArea>
+      <TabsContent value="testcase" className="h-full mt-0">
+        {testcase}
+      </TabsContent>
+    </Tabs>
+  );
+}