fix(i18n): mobile menu sign_out key + nav translations for user section

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

src/components/layout/AppLayout.tsx

@@ -136,14 +136,14 @@ export default function AppLayout({ children }: { children?: React.ReactNode })
                 onClick={() => setMobileOpen(false)}
               >
                 <User className="h-4 w-4" />
-                My account
+                {t('nav.my_account', 'My account')}
               </NavLink>
               <button
                 onClick={() => { logout(); navigate('/'); setMobileOpen(false); }}
                 className="flex items-center gap-2.5 px-3 py-2.5 rounded-xl text-sm font-medium text-destructive hover:bg-destructive/10 transition-all text-left w-full"
               >
                 <LogOut className="h-4 w-4" />
-                Sign out
+                {t('nav.sign_out', 'Sign out')}
               </button>
             </div>
           </div>

src/components/layout/Header.tsx

@@ -187,7 +187,7 @@ export default function Header() {
                     onClick={() => { logout(); navigate('/'); setMobileOpen(false); }}
                     className="w-full px-4 py-2.5 rounded-xl text-sm font-medium border border-border text-muted-foreground hover:text-foreground hover:bg-secondary/50 transition-all"
                   >
-                    Sign out
+                    {t('nav.sign_out', 'Sign out')}
                   </button>
                 </>
               ) : (

src/i18n/locales/en/common.json

@@ -12,7 +12,8 @@
     "app_personas": "Personas",
     "app_focus_groups": "Focus Groups",
     "app_billing": "Billing",
-    "app_admin": "Admin"
+    "app_admin": "Admin",
+    "sign_out": "Sign out"
   },
   "hero": {
     "badge": "Synthetic Research Platform",

src/i18n/locales/ru/common.json

@@ -12,7 +12,8 @@
     "app_personas": "Персоны",
     "app_focus_groups": "Фокус-группы",
     "app_billing": "Биллинг",
-    "app_admin": "Админ"
+    "app_admin": "Админ",
+    "sign_out": "Выйти"
   },
   "hero": {
     "badge": "Платформа синтетических исследований",

src/i18n/locales/uk/common.json

@@ -12,7 +12,8 @@
     "app_personas": "Персони",
     "app_focus_groups": "Фокус-групи",
     "app_billing": "Білінг",
-    "app_admin": "Адмін"
+    "app_admin": "Адмін",
+    "sign_out": "Вийти"
   },
   "hero": {
     "badge": "Платформа синтетичних досліджень",