[1143] 窗口构造三项延后优化，tm_widget ctor 185ms → 110ms#4027
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Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- checkNetworkAvailable 改 singleShot(0)，省构造期创建 QNetworkAccessManager 的 ~37ms - QWK::LoginDialog 惰性创建（ensureLoginDialog 首次显示时才 new + setupLoginDialog），移出构造期 ~90-113ms - 已登录时 refreshMembershipInfoInBackground 改 singleShot(0)， ctor 尾部 43ms → 0ms 关键结论：ensure_window 内大块成本是 Qt 子系统一次性暖场， 只在构造内部删项会让成本迁移到下一个重控件；把工作挪到事件 循环起跑后（singleShot(0)）才真正出关键路径。实测见 devel/1143.md 3.5。 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
checkNetworkAvailable()改QTimer::singleShot(0)，移出构造期 QNetworkAccessManager 首次创建的 ~37msQWK::LoginDialog惰性创建：新增ensureLoginDialog()，首次显示时才new+setupLoginDialog，移出构造期 ~90-113msrefreshMembershipInfoInBackground()改singleShot(0)，ctor 尾部 43ms → 0ms关键结论：ensure_window 内大块成本是 Qt 子系统一次性暖场（字体/样式/网络栈），只在构造内部删项会让成本迁移到下一个重控件（status bar 段 0→53ms）；把工作挪到事件循环起跑后才真正出关键路径——延后后网络栈首次初始化在事件循环里仅 1ms。
实测（同机三次运行）：tm_widget ctor 合计 185ms → 110ms，ensure_window ~204ms → ~166ms。
Test plan
xmake b stem构建通过🤖 Generated with Claude Code