fix(scrollshot): improve Wayland scroll capture reliability

[tianming-1996]

Delay Wayland manual capture until scroll content settles. 延迟 Wayland 手动滚动抓图，等待滚动内容稳定。

Use millisecond timestamps and smaller fake scroll steps. 使用毫秒级时间戳并降低模拟滚动步长。

Log: 修复 Wayland 滚动截图失败问题
Bug: https://pms.uniontech.com/bug-view-352409.html
Influence: 提升 Wayland 下手动和自动滚动截图稳定性，减少无效区域误报。

[deepin-ci-robot]

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This pull-request has been approved by: tianming-1996

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