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>

eslint.config.mjs

@@ -17,6 +17,7 @@ export default tseslint.config(
       '**/*.cjs',
       '**/*.mjs',
       '!eslint.config.mjs',
+      '**/next-env.d.ts',
     ],
   },