🐛 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

internal/app/methods_update_windows_process_test.go

@@ -0,0 +1,19 @@
+//go:build windows
+
+package app
+
+import "testing"
+
+func TestBuildWindowsLaunchCommandHidesConsoleWindow(t *testing.T) {
+	cmd := buildWindowsLaunchCommand(`C:\tmp\gonavi-update\update.cmd`)
+
+	if cmd.SysProcAttr == nil {
+		t.Fatalf("expected Windows update launcher to configure SysProcAttr")
+	}
+	if !cmd.SysProcAttr.HideWindow {
+		t.Fatalf("expected Windows update launcher to hide the console window")
+	}
+	if cmd.SysProcAttr.CreationFlags&windowsCreateNoWindow == 0 {
+		t.Fatalf("expected Windows update launcher to set CREATE_NO_WINDOW, flags=%#x", cmd.SysProcAttr.CreationFlags)
+	}
+}