fix(ui): ErrorBoundary bei Navigation resetten — v1.2.70

ErrorBoundary lag in main.tsx außerhalb des Routers und hatte keinen
Zugriff auf useLocation. Einmal gecatchter Fehler blieb erhalten bis
zum nächsten Reload — daher "EdgeGuard konnte nicht laden" bei
Navigation zum Dashboard.

Fix: LocationKeyBoundary-Wrapper innerhalb des BrowserRouter mit
key={pathname} — React remountet die ErrorBoundary bei jedem
Routenwechsel und löscht damit den Error-State automatisch.

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

management-ui/src/App.tsx

@@ -1,5 +1,6 @@
 import { Suspense, lazy, useEffect, type ReactNode } from 'react'
 import { BrowserRouter, Navigate, Route, Routes, useLocation } from 'react-router-dom'
+import ErrorBoundary from './components/ErrorBoundary'
 import { ConfigProvider, Spin } from 'antd'
 import deDE from 'antd/locale/de_DE'
 import enUS from 'antd/locale/en_US'
@@ -110,6 +111,7 @@ export default function App() {
       <QueryClientProvider client={queryClient}>
         <BrowserRouter>
           <SetupGate>
+            <LocationKeyBoundary>
             <Suspense fallback={<div className="loader-center"><Spin size="large" /></div>}>
               <Routes>
                 <Route path="/setup" element={<SetupPage onComplete={(u: SessionUser) => useAuthStore.getState().set(u)} />} />
@@ -148,9 +150,17 @@ export default function App() {
                 <Route path="*" element={<Navigate to="/dashboard" replace />} />
               </Routes>
             </Suspense>
+            </LocationKeyBoundary>
           </SetupGate>
         </BrowserRouter>
       </QueryClientProvider>
     </ConfigProvider>
   )
 }
+
+// Resets the ErrorBoundary on every route change so a render error on
+// one page never permanently blocks navigation to another page.
+function LocationKeyBoundary({ children }: { children: ReactNode }) {
+  const { pathname } = useLocation()
+  return <ErrorBoundary key={pathname}>{children}</ErrorBoundary>
+}