🐛 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_script_test.go

@@ -64,6 +64,7 @@ func TestBuildWindowsScriptWin10Fixes(t *testing.T) {
 		{"exponential backoff tier 2", `if !RETRY! GEQ 6 set /a WAIT=3`},
 		{"exponential backoff tier 3", `if !RETRY! GEQ 9 set /a WAIT=5`},
 		{"retry limit 15", `if !RETRY! LSS 15`},
+		{"host exit wait timeout", `if !WAIT_PID_SECONDS! GEQ 90 (`},
 		{"cleanup old file", `del /F /Q "%TARGET_OLD%"`},
 	}
 	for _, fix := range win10Fixes {
@@ -110,7 +111,7 @@ func TestBuildWindowsScriptUsesDelayedErrorlevelInsideBlocks(t *testing.T) {
 	}
 }
 
-func TestBuildWindowsLaunchCommandUsesDirectCall(t *testing.T) {
+func TestBuildWindowsLaunchCommandUsesDirectHiddenCall(t *testing.T) {
 	cmd := buildWindowsLaunchCommand(`C:\tmp\gonavi-update\update.cmd`)
 
 	if !strings.EqualFold(cmd.Args[0], cmd.Path) && !strings.HasSuffix(strings.ToLower(cmd.Path), `\cmd.exe`) {