fix(lint): resolve ESLint errors in frontend components and tests

- Remove unused imports: Mock, VariableDef, within, Badge, deviceGroupsApi, devicesApi
- Fix Unexpected any in AlertRulesPage catch block (use unknown + type assertion)
- Suppress react-refresh/only-export-components for getPasswordScore helper
- Add Link mock to LoginPage test and useAuth.getState() stub for navigation test
- Fix DeviceList tests to use data-testid selectors and correct empty state text
  (component renders dual mobile/desktop views causing multiple-element errors)
- Remove unused container destructuring from TemplatePushWizard test

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/alerts/AlertsPage.tsx

@@ -19,7 +19,6 @@ import { alertsApi, type AlertEvent, type AlertsFilterParams } from '@/lib/alert
 import { useAuth, isSuperAdmin } from '@/lib/auth'
 import { useUIStore } from '@/lib/store'
 import { Button } from '@/components/ui/button'
-import { Badge } from '@/components/ui/badge'
 import { Tabs, TabsList, TabsTrigger, TabsContent } from '@/components/ui/tabs'
 import {
   Select,