🐛 fix(windows): 修复在线更新挂起与 WebView2 启动闪退

- 隐藏并释放 Windows 更新脚本进程，避免在线更新打开 cmd 并挂起
- 为更新脚本等待宿主进程退出增加超时保护
- 收窄自动 WebView2 zoom reset 触发条件并补充异常兜底
- 补充 Windows 更新启动与窗口缩放回归测试
Refs #468

frontend/src/utils/windowStateUi.ts

@@ -20,6 +20,11 @@ export const shouldToggleMaximisedWindowForScaleFix = (
   hasViewportScaleDrift: boolean,
 ): boolean => reason === 'ratio-change' && hasViewportScaleDrift;
 
+export const shouldResetWebViewZoomForScaleFix = (
+  reason: WindowScaleFixReason,
+  hasViewportScaleDrift: boolean,
+): boolean => reason === 'restore' && hasViewportScaleDrift;
+
 export const resolveWindowsScaleCheckDelayMs = (trigger: WindowsScaleCheckTrigger): number =>
   trigger === 'resize' ? 240 : 0;