fix(frontend): remove duplicate History link from NavBar

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

frontend/src/components/NavBar.tsx

@@ -53,18 +53,6 @@ export const NavBar: React.FC = () => {
         >
           History
         </NavLink>
-        <NavLink
-          to="/history"
-          className={({ isActive }) =>
-            `text-sm font-medium transition-colors ${
-              isActive
-                ? 'text-gray-900 border-b-2 border-gray-900'
-                : 'text-gray-500 hover:text-gray-700 border-b-2 border-transparent'
-            }`
-          }
-        >
-          History
-        </NavLink>
       </div>
     </nav>
   )