fix: resolve all ESLint errors across API and web packages

Fix 19+ lint errors: unused imports (Phone, DuplicateCandidate, listingDetailsSchema),
import ordering violations, consistent-type-imports, and constant binary expression
in test file.

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

apps/web/lib/__tests__/listing-validations.spec.ts

@@ -2,7 +2,6 @@ import { describe, it, expect } from 'vitest';
 import {
   listingBasicSchema,
   listingLocationSchema,
-  listingDetailsSchema,
   listingPricingSchema,
   createListingSchema,
   TRANSACTION_TYPES,

apps/web/lib/__tests__/utils.spec.ts

@@ -7,7 +7,8 @@ describe('cn', () => {
   });
 
   it('should handle conditional classes', () => {
-    expect(cn('base', false && 'hidden', 'visible')).toBe('base visible');
+    const isHidden = false;
+    expect(cn('base', isHidden && 'hidden', 'visible')).toBe('base visible');
   });
 
   it('should merge conflicting Tailwind classes', () => {

apps/web/vitest.config.ts

@@ -1,5 +1,5 @@
-import { defineConfig } from 'vitest/config';
 import path from 'path';
+import { defineConfig } from 'vitest/config';
 
 export default defineConfig({
   test: {