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

src/app/(modules)/layout.tsx

@@ -16,7 +16,7 @@ const ModulesLayout = ({
       <SidebarProvider>
         <AppSidebar />
         <main className="flex flex-1 flex-col w-full h-screen overflow-hidden">
-          <div className="flex-1 overflow-auto">
+          <div className="flex-1 overflow-auto [scrollbar-gutter:stable]">
             <div className="max-w-380 mx-auto w-full flex flex-col min-h-full">
               <div className="flex gap-3 items-center sticky top-0 bg-background z-50 py-3 px-6 border-b border-border">
                 <SidebarTrigger />