fix: 修复 Windows Node.js 构建产物因 stdin.ref() 泄漏导致进程挂起 (#353)

startCapturingEarlyInput() 调用 stdin.ref() 后，如果 Ink 未能接管
（如 raw mode 不支持或 setup 阶段异常），unref() 永远不会被调用，
导致 Node.js 事件循环无法退出。修复包括：
- stopCapturingEarlyInput() 中补充 stdin.unref() 调用
- 新增 10s 安全阀定时器自动清理 leaked ref()
- Ink App.componentWillUnmount 兜底 unref() 非 TTY stdin

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

packages/@ant/ink/src/components/App.tsx

@@ -286,6 +286,15 @@ export default class App extends PureComponent<Props, State> {
     // ignore calling setRawMode on an handle stdin it cannot be called
     if (this.isRawModeSupported()) {
       this.handleSetRawMode(false)
+    } else {
+      // Even when raw mode was never enabled (e.g. non-TTY stdin on
+      // Windows Node.js), ensure stdin is unref'd so the process can
+      // exit. earlyInput may have called ref() before Ink mounted.
+      try {
+        this.props.stdin.unref()
+      } catch {
+        // stdin may already be destroyed
+      }
     }
   }