fix: 修复区域筛选面板多余closing tag导致的编译错误

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

src/App.tsx

@@ -1844,7 +1844,6 @@ export default function App() {
                             <PlusCircle className="rotate-45" size={16} />
                           </button>
                         </div>
-                        </button>
                       </div>
 
                       <div className="space-y-4">