feat(playground): add submission tab to problem layout

src/app/(app)/playground/@problem/layout.tsx

@@ -1,15 +1,17 @@
-import { FileTextIcon, FlaskConicalIcon } from "lucide-react";
 import { ScrollArea, ScrollBar } from "@/components/ui/scroll-area";
 import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
+import { CircleCheckBigIcon, FileTextIcon, FlaskConicalIcon } from "lucide-react";
 
 interface ProblemLayoutProps {
   description: React.ReactNode;
   solution: React.ReactNode;
+  submission: React.ReactNode;
 }
 
 export default function ProblemLayout({
   description,
   solution,
+  submission,
 }: ProblemLayoutProps) {
   return (
     <Tabs defaultValue="description" className="h-full flex flex-col">
@@ -37,15 +39,29 @@ export default function ProblemLayout({
             />
             Solution
           </TabsTrigger>
+          <TabsTrigger
+            value="submission"
+            className="data-[state=active]:bg-primary data-[state=active]:text-primary-foreground rounded-full data-[state=active]:shadow-none"
+          >
+            <CircleCheckBigIcon
+              className="-ms-0.5 me-1.5 opacity-60"
+              size={16}
+              aria-hidden="true"
+            />
+            Submission
+          </TabsTrigger>
         </TabsList>
         <ScrollBar orientation="horizontal" />
       </ScrollArea>
-      <TabsContent value="description" className="flex-1 mt-0">
+      <TabsContent value="description" className="h-full mt-0">
         {description}
       </TabsContent>
-      <TabsContent value="solution" className="flex-1 mt-0">
+      <TabsContent value="solution" className="h-full mt-0">
         {solution}
       </TabsContent>
+      <TabsContent value="submission" className="flex-1 mt-0">
+        {submission}
+      </TabsContent>
     </Tabs>
   );
 }