优化sidebar和mainlayout布局

src/layouts/MainLayout.tsx

@@ -77,10 +77,10 @@ export const MainLayout = () => {
   }, []);
 
   return (
-    <div className='min-h-screen bg-gray-50 text-gray-900 grid grid-cols-[240px_1fr]'>
+    <div className='h-screen bg-gray-50 text-gray-900 grid grid-cols-[240px_1fr] overflow-hidden'>
       <Sidebar active={activeSection} onNavigate={handleNavigate} onQuickAction={setQuickAction} />
 
-      <div className='flex flex-col min-h-screen'>
+      <div className='flex flex-col h-screen overflow-hidden'>
         <TopBar
           search={search}
           onSearch={setSearch}