fix(detail): remove stale detail tab without submission

src/features/problems/detail/components/panel.tsx

@@ -12,7 +12,11 @@ interface DetailPanelProps {
 
 export const DetailPanel = ({ submissionId }: DetailPanelProps) => {
   if (!submissionId) {
-    return <DetailContentSkeleton />;
+    return (
+      <PanelLayout isScroll={false}>
+        <DetailContentSkeleton />
+      </PanelLayout>
+    );
   }
 
   return (

src/features/problems/detail/components/tab-sync.tsx

@@ -0,0 +1,25 @@
+"use client";
+
+import { useEffect } from "react";
+import { Actions } from "flexlayout-react";
+import { useProblemFlexLayoutStore } from "@/stores/flexlayout";
+
+interface DetailTabSyncProps {
+  submissionId: string | undefined;
+}
+
+export const DetailTabSync = ({ submissionId }: DetailTabSyncProps) => {
+  const { model } = useProblemFlexLayoutStore();
+
+  useEffect(() => {
+    if (!model || submissionId) return;
+
+    const detailTab = model.getNodeById("detail");
+    if (!detailTab) return;
+
+    model.doAction(Actions.selectTab("submission"));
+    model.doAction(Actions.deleteTab("detail"));
+  }, [model, submissionId]);
+
+  return null;
+};

src/features/problems/ui/views/problem-view.tsx

@@ -2,6 +2,7 @@ import { TestcasePanel } from "@/features/problems/testcase/panel";
 import { BotPanel } from "@/features/problems/bot/components/panel";
 import { CodePanel } from "@/features/problems/code/components/panel";
 import { DetailPanel } from "@/features/problems/detail/components/panel";
+import { DetailTabSync } from "@/features/problems/detail/components/tab-sync";
 import { SolutionPanel } from "@/features/problems/solution/components/panel";
 import { SubmissionPanel } from "@/features/problems/submission/components/panel";
 import { DescriptionPanel } from "@/features/problems/description/components/panel";
@@ -26,6 +27,7 @@ export const ProblemView = ({ problemId, submissionId }: ProblemViewProps) => {
 
   return (
     <div className="relative flex h-full w-full">
+      <DetailTabSync submissionId={submissionId} />
       <SubmissionRealtimeListener problemId={problemId} />
       <ProblemFlexLayout components={components} />
     </div>