feat(ticket): split overview/class detail queries and add loading skeletons

src/app/(modules)/ticket/[ticketId]/components/TicketOverviewSkeleton.tsx

@@ -0,0 +1,41 @@
+import { Card, CardContent, CardHeader } from '@/components/ui/card';
+import { Skeleton } from '@/components/ui/skeleton';
+
+function OverviewSkeletonField() {
+  return (
+    <div className="space-y-2">
+      <Skeleton className="h-3 w-24" />
+      <Skeleton className="h-4 w-32" />
+    </div>
+  );
+}
+
+export function TicketOverviewHeaderSkeleton() {
+  return (
+    <div className="flex flex-col gap-4 sm:flex-row sm:items-start sm:justify-between">
+      <div className="min-w-0 space-y-2">
+        <Skeleton className="h-8 w-40" />
+        <Skeleton className="h-3 w-36 max-w-full" />
+      </div>
+
+      <div className="flex shrink-0 items-center gap-2">
+        <Skeleton className="h-8 w-28" />
+      </div>
+    </div>
+  );
+}
+
+export function TicketOverviewCardSkeleton() {
+  return (
+    <Card aria-label="Loading ticket overview">
+      <CardHeader>
+        <Skeleton className="h-4 w-20" />
+      </CardHeader>
+      <CardContent className="grid grid-cols-2 gap-x-4 gap-y-6 md:grid-cols-4">
+        {Array.from({ length: 4 }).map((_, index) => (
+          <OverviewSkeletonField key={index} />
+        ))}
+      </CardContent>
+    </Card>
+  );
+}