fix: 修复副屏任务栏重启后不显示及高度异常问题 - #495
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- FindHandles 不再 fallback 到主屏，副屏未就绪时返回 Zero 触发重试 - 新增 IsOnCorrectScreen 检测句柄是否挂载在正确屏幕 - Tick 中增加 isWrongScreen 检查，挂载错误屏幕时触发重新查找 - 句柄变化时立即重新挂载，解决 Win10 策略缓存过期问题 - 修复 DPI 缩放导致 Screen.Bounds 与 WorkingArea 坐标空间不一致
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问题
在多显示器环境下，将任务栏设置到副屏后，每次重启程序都无法在副屏任务栏显示，需要手动切回主屏再切回副屏才能恢复。同时副屏任务栏会占位但内容不可见。
根因
FindHandles fallback 到主屏：启动时副屏任务栏（
Shell_SecondaryTrayWnd）可能尚未就绪，原代码会 fallback 到主屏Shell_TrayWnd，且 Tick 重试逻辑无法检测到这个错误，导致永远停留在主屏。DPI 缩放导致坐标空间不一致：
Screen.Bounds返回物理像素，Screen.WorkingArea返回逻辑像素，两者相减得到错误的高度（如 424px 而非 40px），导致窗口被拉伸但内容不可见。修复
FindHandles找不到副屏任务栏时返回IntPtr.Zero，不再 fallback 到主屏，让 Tick 重试机制生效IsOnCorrectScreen()检测当前句柄是否挂载在目标屏幕上isWrongScreen检查，挂载到错误屏幕时触发重新查找GetTaskbarRect中当物理矩形高度已是合理任务栏高度（20~100px）时直接使用，绕过 DPI 缩放不一致问题测试环境