chore(lint): remove ESLint configuration file and update lint scripts

- Deleted the .eslintrc.cjs file to simplify configuration management.
- Updated lint scripts in package.json to remove unnecessary extensions for linting.
- Added new devDependencies for ESLint and globals to enhance linting capabilities.

tests/unit/stores.test.ts

@@ -1,7 +1,7 @@
 /**
  * Zustand Stores Tests
  */
-import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { describe, it, expect, beforeEach } from 'vitest';
 import { useSettingsStore } from '@/stores/settings';
 import { useGatewayStore } from '@/stores/gateway';
 

tests/unit/utils.test.ts

@@ -2,7 +2,7 @@
  * Utility Functions Tests
  */
 import { describe, it, expect } from 'vitest';
-import { cn, formatRelativeTime, formatDuration, truncate } from '@/lib/utils';
+import { cn, formatDuration, truncate } from '@/lib/utils';
 
 describe('cn (class name merge)', () => {
   it('should merge class names', () => {
@@ -10,8 +10,8 @@ describe('cn (class name merge)', () => {
   });
   
   it('should handle conditional classes', () => {
-    expect(cn('base', true && 'active')).toBe('base active');
-    expect(cn('base', false && 'active')).toBe('base');
+    expect(cn('base', 'active')).toBe('base active');
+    expect(cn('base', false)).toBe('base');
   });
   
   it('should merge tailwind classes correctly', () => {