fix(audit): P2 frontend any→concrete types (181→61), heroicons→lucide-react, missing type exports, toast API, Select options, TaskStatus types; P2-9 hooks.py type annotations

frontend/src/App.tsx

@@ -1,3 +1,4 @@
+import { asError } from '@/utils/errorTypes';
 import React from 'react';
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
 import { AppRouter } from '@/routes';
@@ -21,10 +22,10 @@ function QueryClientWrapper({ children }: { children: React.ReactNode }) {
       },
       mutations: {
         retry: 0,
-        onError: (error: any) => {
+        onError: (error: unknown) => { const errObj = asError(error);
           // Don't show toast for 401 (handled by auth)
-          if (error?.status === 401) return;
-          const msg = error?.detail || error?.message || 'Ein Fehler ist aufgetreten';
+          if (errObj?.status === 401) return;
+          const msg = errObj?.detail || errObj?.message || 'Ein Fehler ist aufgetreten';
           toast.error(msg);
         },
       },