fix: QA audit — lint cleanup, i18n fixes, module visibility, sidebar UX

- Fix 97 lint errors → 0 (unused imports, params, variables across 40+ files)
- Fix i18n key format: colon → dot notation for next-intl compatibility
- Add missing i18n keys (routes.application, routes.home, confirm)
- Fix module visibility: sidebar now respects per-account DB features
- Fix inject function: use dot-notation keys, add collapsed:true defaults
- Fix ConfirmDialog: use useTranslations instead of hardcoded German defaults
- Fix events page: replace placeholder 'Beschreibung' with proper description
- Fix Dockerfile: add NEXT_PUBLIC_CI ARG for Docker builds
- Collapse secondary sidebar sections by default for cleaner UX

packages/features/auth/src/components/multi-factor-challenge-container.tsx

@@ -9,7 +9,7 @@ import type { Factor } from '@supabase/supabase-js';
 import { zodResolver } from '@hookform/resolvers/zod';
 import { useMutation } from '@tanstack/react-query';
 import { Fingerprint, KeyRound, TriangleAlert } from 'lucide-react';
-import { useForm, useWatch } from 'react-hook-form';
+import { useForm } from 'react-hook-form';
 import * as z from 'zod';
 
 import { useFetchAuthFactors } from '@kit/supabase/hooks/use-fetch-mfa-factors';