refactor: standardize card styles and improve layout across dashboard components

web/components/site-header.tsx

@@ -3,13 +3,10 @@
 import { useEffect, useRef } from "react"
 import { usePathname } from "next/navigation"
 
-import { LocaleSwitcher } from "@/components/locale-switcher"
 import { RealtimeConnectionStatus } from "@/components/realtime-connection-status"
 import { useI18n } from "@/i18n/provider"
 import { getPageTitleKey } from "@/lib/navigation"
 import { useAgentConversationsStore } from "@/lib/stores/agent-conversations"
-import { PaletteToggle } from "@/components/palette-toggle"
-import { ThemeToggle } from "@/components/theme-toggle"
 import {
   Breadcrumb,
   BreadcrumbItem,
@@ -77,11 +74,6 @@ export function SiteHeader() {
             </Breadcrumb>
           </div>
         </div>
-        <div className="flex items-center justify-end gap-2">
-          <LocaleSwitcher />
-          <PaletteToggle />
-          <ThemeToggle />
-        </div>
       </div>
     </header>
   )