fix(scrollshot): improve Wayland scroll screenshot reliability

[tianming-1996]

Fix occasional manual wheel unresponsiveness in Wayland scroll capture. Optimize auto-scroll step and tolerate first frames without displacement. Use millisecond timestamps to avoid inaccurate time-diff calculation.

修复 Wayland 环境下滚动截图手动滚轮偶发无响应的问题。
优化自动滚动步长，增加首帧无位移容错，降低误报概率。
调整滚动截图时间戳类型，避免时间差计算精度不足。

Log: 修复 Wayland 环境下滚动截图失败问题
Bug: https://pms.uniontech.com/bug-view-278311.html

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: add-uos, max-lvs, tianming-1996

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