feat: update knowhub frontend

knowhub/frontend/src/layouts/MainLayout.tsx

@@ -1,5 +1,4 @@
 import { useEffect, useRef } from 'react';
-import { Navbar } from '../components/layout/Navbar';
 import type { TabId } from '../components/layout/Navbar';
 
 interface MainLayoutProps {
@@ -85,8 +84,7 @@ export function MainLayout({ activeTab, onTabChange, children }: MainLayoutProps
 
   return (
     <div className="min-h-screen bg-slate-50 flex flex-col overflow-x-hidden" style={{ overscrollBehaviorX: 'none' }}>
-      <Navbar activeTab={activeTab} onTabChange={onTabChange} />
-      <main className="w-full overflow-hidden relative" style={{ height: 'calc(100vh - 60px)' }}>
+      <main className="w-full overflow-hidden relative h-screen">
         <div
           className="flex h-full will-change-transform"
           style={{