Remove next-intl localization infrastructure

Strips out the i18n layer (next-intl, message files, language switcher,
provider) to reduce complexity. Nav components now use plain English strings.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/layouts/role-nav.tsx

@@ -4,7 +4,6 @@ import { useState, useEffect } from 'react'
 import Link from 'next/link'
 import { usePathname } from 'next/navigation'
 import { signOut, useSession } from 'next-auth/react'
-import { useTranslations } from 'next-intl'
 import { cn } from '@/lib/utils'
 import { Button } from '@/components/ui/button'
 import { UserAvatar } from '@/components/shared/user-avatar'
@@ -22,7 +21,6 @@ import { LogOut, Menu, Moon, Settings, Sun, User, X } from 'lucide-react'
 import { useTheme } from 'next-themes'
 import { Logo } from '@/components/shared/logo'
 import { NotificationBell } from '@/components/shared/notification-bell'
-import { LanguageSwitcher } from '@/components/shared/language-switcher'
 
 export type NavItem = {
   name: string
@@ -51,8 +49,6 @@ function isNavItemActive(pathname: string, href: string, basePath: string): bool
 
 export function RoleNav({ navigation, roleName, user, basePath, statusBadge }: RoleNavProps) {
   const pathname = usePathname()
-  const tCommon = useTranslations('common')
-  const tAuth = useTranslations('auth')
   const [isMobileMenuOpen, setIsMobileMenuOpen] = useState(false)
   const { status: sessionStatus } = useSession()
   const isAuthenticated = sessionStatus === 'authenticated'
@@ -111,7 +107,6 @@ export function RoleNav({ navigation, roleName, user, basePath, statusBadge }: R
                 )}
               </Button>
             )}
-            <LanguageSwitcher />
             <NotificationBell />
             <DropdownMenu>
               <DropdownMenuTrigger asChild>
@@ -135,7 +130,7 @@ export function RoleNav({ navigation, roleName, user, basePath, statusBadge }: R
                 <DropdownMenuItem asChild>
                   <Link href={"/settings/profile" as Route} className="flex cursor-pointer items-center">
                     <Settings className="mr-2 h-4 w-4" />
-                    {tCommon('settings')}
+                    Settings
                   </Link>
                 </DropdownMenuItem>
                 <DropdownMenuSeparator />
@@ -144,7 +139,7 @@ export function RoleNav({ navigation, roleName, user, basePath, statusBadge }: R
                   className="text-destructive focus:text-destructive"
                 >
                   <LogOut className="mr-2 h-4 w-4" />
-                  {tAuth('signOut')}
+                  Sign Out
                 </DropdownMenuItem>
               </DropdownMenuContent>
             </DropdownMenu>
@@ -196,7 +191,7 @@ export function RoleNav({ navigation, roleName, user, basePath, statusBadge }: R
                 onClick={() => signOut({ callbackUrl: '/login' })}
               >
                 <LogOut className="mr-2 h-4 w-4" />
-                {tAuth('signOut')}
+                Sign Out
               </Button>
             </div>
           </nav>