feat(i18n): migrate hardcoded German strings to t() across 104 components/pages — AST-based batch with re-parse gate, 423 new de.json keys; tsc clean; vitest failures byte-identical to clean-tree baseline (pre-existing)

frontend/src/App.tsx

@@ -8,9 +8,11 @@ import { useThemeStore } from '@/store/themeStore';
 import { ErrorBoundary } from '@/components/common/ErrorBoundary';
 import { useToast } from '@/components/ui/Toast';
 import { useOnlineStatus } from '@/hooks/useOnlineStatus';
+import { useTranslation } from 'react-i18next';
 
 
 function QueryClientWrapper({ children }: { children: React.ReactNode }) {
+  const { t } = useTranslation();
   const toast = useToast();
 
   const [queryClient] = React.useState(() => new QueryClient({
@@ -40,18 +42,20 @@ function QueryClientWrapper({ children }: { children: React.ReactNode }) {
 }
 
 function OfflineBanner() {
+  const { t } = useTranslation();
   const isOnline = useOnlineStatus();
 
   if (isOnline) return null;
 
   return (
     <div className="fixed top-0 left-0 right-0 z-[200] bg-warning-500 text-white text-center py-2 px-4 text-sm font-medium shadow-md">
-      Sie sind offline. Änderungen werden gespeichert wenn die Verbindung wiederhergestellt ist.
+      {t('app.siesindofflineänderungenwerdengespeicher')}
     </div>
   );
 }
 
 export default function App() {
+  const { t } = useTranslation();
   const { logout } = useAuthStore();
   const loadThemeFromStorage = useThemeStore((s) => s.loadFromStorage);
   const toast = useToast();
@@ -76,7 +80,7 @@ export default function App() {
         href="#main-content"
         className="sr-only focus:not-sr-only focus:absolute focus:top-2 focus:left-2 focus:z-[300] focus:px-4 focus:py-2 focus:bg-primary-600 focus:text-white focus:rounded-md"
       >
-        Zum Hauptinhalt springen
+        {t('app.zumhauptinhaltspringen')}
       </a>
       <ErrorBoundary>
         <AppRouter />