fix(lint): resolve all 24 ESLint errors across web, api and e2e

- Remove unused imports (waitFor, useAuthStore) in dashboard test files
- Convert import() type annotation to import type in comparison-store spec
- Add next-env.d.ts to ESLint ignores (auto-generated file)
- Fix empty object pattern in auth.fixture.ts
- Sort import order alphabetically in 5 API test files

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/lib/__tests__/comparison-store.spec.ts

@@ -2,6 +2,7 @@
  * @vitest-environment node
  */
 import { describe, it, expect, beforeEach, vi } from 'vitest';
+import type { ListingDetail } from '../listings-api';
 
 // Provide a minimal localStorage mock before importing the store module
 // (Zustand persist needs getItem/setItem)
@@ -17,7 +18,6 @@ vi.stubGlobal('localStorage', {
 
 // Now import after mocks are in place
 const { useComparisonStore, computeComparisonStats, MAX_COMPARE, MIN_COMPARE } = await import('../comparison-store');
-type ListingDetail = import('../listings-api').ListingDetail;
 
 // Reset Zustand store between tests
 beforeEach(() => {